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Andrena rozeni Linsley & MacSwain, 1955
Andrena (Melandrena) rozeni Linsley and MacSwain, 1955

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Onagrandrena


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Overview
Text used courtesy of the Illinois Natural History Survey from: LaBerge, W. E., Thorp, R. W., 2005. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XIV. Subgenus Onagrandrena. Illinois Natural History Survey Bulletin 37: 1-63.

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Andrena rozeni is a distinctive species related to the deserticola group of species, but resembling members of the large oenotherae group of species. It can be separated from oenotherae in either sex by the scutellum having distinct punctures separated by half or more puncture widths especially in the anterior fourth, the interpunctural spaces being dulled by fine tessellation. The tibial scopal hairs are relatively sparse, as in chylismiae. but the females of rozeni have terga 2 — 4, more closely punctate basally and the scutellar punctures of chylismiae are close set as in oenotherae. Rarely the females of rozeni have hairs along the posterior margin of the scutellum reddish brown to red, as in some females of anograe, but can be separated from the latter by the scutellar sculpturing as described below and the coarser propodeal sculpturing. The male of rozeni can be separated from other members of the oenotherae group by the pale facial and thoracic hairs together with the sparse scutella punctures.

FEMALE: MEASUREMENTS AND RATIOS. — N = 20; length. 10-13 mm; width. 3-4 mm WL, M = 4.05 ± 0.175 mm; FL/FW, M = 1.10 ± 0.004; FOVL/FOVW, M = 3.24 ± 0.053.

DIAGNOSIS. — Vestiture black except occasionally ochraceous to reddish brown hairs present along posterior border of scutellum; wing membranes hyaline. slightly if at all infumate, veins dark reddish brown to dark brown; metasomal terga without metallic reflections. Galeae, vertex and ocelli as in oenotherae. Labral process narrowed apically, with sides concave, apical part about as broad as long and about as broad as base of scape. Clypeus sculptured as in oenotherae; vertex above lateral ocellus equals ocellar diameter or slightly less. Pronotum without humeral angle or vertical ridge laterally. Mesoscutum with crowded small punctures separated mostly by half a puncture width or less, surface dulled by fine tessellation. Scutellum punctate, near anterior margin punctures distinctly separated by half to one puncture width, surface finely tessellate. Propodeum sculptured as in oenotherae; mesepisternum coarsely punctatorugose except posteromedially where punctures small, obscured by dense tessellation. Terga 1-A with basal area punctures separated by half to one puncture width or slightly more, surface shiny; apical areas punctate below: basally (basal hall to three-fourths), punctures separated mostly by half to two or three puncture widths or more, surfaces shiny. Thoracic dorsum with hairs much longer than width of scape; propodeum without distinct corbicula laterally, hairs long and plumose; scopal hairs long, simple, sparse, not at all hiding surface of tibia.

MALE: MEASUREMENTS AND RATIOS. — N = 20; length, 9-11 mm; width, 2.5-3.0 mm; WL, M = 3.59 ± 0.236 mm; FL/FW, M = 1.17 ± 0.010; FS1/FS2, M = 1.20 ± 0.020.

DIAGNOSIS. — Vestiture black except as follows: head hairs white except vertex with short to long black hairs, face in narrow zone near eye margin usually with dark hairs, genal area often with dark hairs mixed with the white; thoracic hairs white except pleurae with some dark brown to black hairs ventrally and on lower lateral surfaces; metasomal tergum 1 often with white hairs basally. Wing membranes hyaline, veins dark reddish brown; metasomal terga black, apical areas not translucent. Galeae as in female; labral process bidentate; clypeus densely punctate; vertex above lateral ocellus equals one ocellar diameter or slightly less: flagellar segment 1 as in oenotherae. labral process large, bidentate, reflexed. Pronotum as in female; mesoscutum and scutellum as in female but punctures slightly smaller; mesepisternal sculpture as in female; propodeum as in oenotherae. Metasomal terga 2-5 sculptured as in female terga 2-4 but punctures slightly sparser. Metasomal tergum 2 with basal area hairs shorter than half length of hairs of tergum 1; hind tibiae with hairs sparse and long as in oenotherae. Sternum 7 similar to that of chylismiae in shape but with abundant short hairs on apicomedian lobes and apicolaterally; sternum 7 distinctly capitate, apex rounded, neck region narrow, vestiture coarse, long, dense (Figs. 49-50).

TYPE MATERIAL. — The holotype female of Andrena (O.) rozeni (CAS No. 6,708) was collected from near Needles, San Bernardino County, California, March 6, 1930. by E. G. Linsley.

DISTRIBUTION. — Andrena rozeni is known from southern California. Nevada, Arizona, and Sonoran Mexico (Linsley, MacSwain, and Raven, 1963, pp. 7, 36) (Fig. 3). It has been taken from December 4 through June 23 but chiefly from late February to the end of April. In addition to the holotype, a total of 962 females and 237 males were examined from localities listed below.

Arizona. LA PAZ CO.: Vicksburg. MAR1COPACO.: Gila Bend (13 and 32 mi. E). PIMA CO.: Cortaro; Sells (32.8mi.NE). YUMA CO.: Hope (7 mi. W); Mohawk (9.5 nil W): Yuma. CALIFORNIA. IMPERIAL CO.: Coyote Wells (3 and 6 mi. W); Kane Springs; Ucotillo; Palo Verde (and 3 mi. S); Yuma Desert. INYO CO.: Eureka Dune (35 mi. ESE of Bigpine); Lone Pine (N of Goodale Creek); Shoshone (5.5 mi. N). KERN CO. Sand Canyon (3 mi. W of Brown); Walker Pass (1 mi. W). LOS ANGELES CO. Edwards Airforce Base (SW boundary and 1 mi. S); Llano (2 mi. SW). RIVERSIDE CO. Andreas Canyon; Berdoo Canyon: Blythe (18 mi. W); Boyd Desert Research Center (4 mi S of Palm Desert); Coachella Valley: Desert Center (4 mi. E); Desert Hot Springs (Whitehouse Canyon); Hopkins Well (2 mi. W); Indio; Joshua Tree Natl. Men. (Bell Picnic area); La Quinta; Palm Canyon; Palm Desert; Pinyon Crest (12 road mi. SW Palm Desert); Thousand Palms. SAN BERNARDINO CO.: Baker (2 mi. N); Baker Sand Dunes (9 air mi. S, Zzyzx Springs); Cajon Pass: Calico: Essex; Kelso (7 mi. S in Providence Mts.); Kramer Hills; Kramer Junction: Mojave Desert; Needles (and near and 30 mi. S); Salton Sea; Vidal Junction (7 mi. N): Vidal (5 mi. N); Vulcan Mines; Yucca Valley. SAN DIEGO CO.: Borrego (9 mi. E at Coyote Creek); Borrego Palm Canyon. Borrego State Park; Borrego Springs; Borrego Valley (and dunes); Jacumba (5 mi. E); Julian (near Salton Sea): Sentenac Canyon; Tub Canyon (Borrego). NEVADA. CLARK CO.: Searchlight. WASHOE CO.: Sparks (4.5 mi. N); Wadsworth (28 mi. W). MEXICO. SONORA: Sonoyta (50 mi. W and 134 km S).

NEST BIOLOGY. — Females of A. rozeni nest in sandy soil (Linsley et al. 1963a). They prefer shallow depressions and the base of shaded road cuts as sites to initiate nest construction. Their burrows angle about 45 degrees downward for the first 5 cm or more, descend vertically for about 1 meter and turn horizontally for about 20 cm where a brood cell is constructed. Burrows were commonly started in the afternoon with excavation continuing through the night. Females seem to require more than one night of nest preparation before initiating pollen foraging.

FLORAL RECORDS. — Andrena rozeni is an oligolege of plants of crepuscular blooming species of the genus Camissonia and has been collected from plants listed below.

Agoseris glauca, Baccharis sp., Baileya sp., B. multiradiata. Brassica sp., Camissonia boothii decorticans, C. claviformis aurantiaca, C. c. claviformis, C. c. integrior, C. c. peirsonii, C. tanaecetifolia, Cryptantha clevelandii, C. intermedia, Encelia sp., E. farinosa, Geraea canescens, Hyptis emoryi, Isomeris arborea. Madia rammii, Medicago sativa, Mirabilis sp., Oenothera sp., O. deltoides pinnata. O. pallida, (as latifolia), O. piperi, O. trichocalyx, Sisymbrium altissimum, Stanleya sp., Taraxacum officinale.

Identification
A. (M.) rozeni is closely related to A. (M.) oenotherae Timberlake. The female differs from oenotherae in having the produced apex of the process of the labrum wider than long, the notal hairs of the thorax brown rather than black, the upper margin of the facial foveae impunctate, the enclosure of the propodeum more coarsely and obliquely rugose, and the metasoma more slender, with the apical margins of the terga feebly impressed and constricted, the surface less densely punctate and pubescent, with the impunctate margins of the metasomal terga broad except on the ' first one. The male differs at once from oenotherae in the white pubescence of the face and thoracic pleura. Among the females there is some variation in the width of impunctate margin of the metasomal terga, the development of the apex of the process of the labrum, and the extent of the brownish pubescence on the thorax.


Female.—Integument black metasoma faintly tinted with reddish; hairs black, those of notum of thorax with a brownish cast. Head with clypeus convex, shining, finely and closely punctured with a taint indication of median smooth line; labrum with process broader than long, base a low triangle, apex distinctly produced, broader than long, feebly depresso-emarginate in type, more distinctly in some paratypes; vertex with an impunctate area along upper margin of facial foveae between ocelli and compound eyes; antennae with first flagellar segment about as long as second and third combined, flagellum dark reddish-brown beneath. Mesosoma with mesoscutum dullish, finely and closely punctured, punctures on posterior middle of disk one to one and one-half puncture widths apart with interspaces minutely reticulate; mesoscutellum punctured much as mesoscutum; mesopleura a little more densely punctured than mesoscutum; propodeum with basal en¬closure well defined, very coarsely and somewhat obliquely rugose, remaining surface coarsely, densely rugoso-punctate; wings subhyaline, tinted with blackish; legs with scopa of posterior tibiae long and dense. Metasoma slender, apical margin of terga scarcely constricted, surface shining, finely but not closely punctured, first metasomal tergum with a narrow impunctate margin, broad on terga two to four; pubescence of second tergum moderately thin, short, simple. Length approximately 11.5 mm., anterior wing 8.5 mm.



Male.—Integument black; hairs of head, thorax, propodeum, anterior femora (intermediate and posterior femora predominantly), and first meta¬somal tergum, long, erect, white, elsewhere dark brown or black. Head. with clypeus shining, moderately densely punctate at middle, more densely at sides; labrum with process emarginate, somewhat acutely bilobed; antennae with flagellum brownish, first flagellar segment nearly as long as second. Mesosoma with dorsal pubescence thin, not obscuring punctation; mesoscutum dull, moderately closely punctate on disk, densely at sides; propodeum densely punctate, enclosure coarsely, longitudinally rugose. Metasoma with a narrow impunctate margin on first metasomal tergum, broad on terga two to five. Length approximately 10 mm., anterior wing 8.5 mm.

Names
Scientific source:

References
Andrena (Melandrena) rozeni Linsley and MacSwain, 1955, Pan-Pacific Ent., 31: 164, 166, 168-170; Linsley, MacSwain, and Smith, 1955, Pan-Pacific Ent., 31: 176, 179.

Andrena (Onagrandrena) rozeni: Linsley and MacSwain. 1956, Pan-Pacific Ent., 32: 112; Linsley, MacSwain, and Raven, 1963. Univ. California Publ. Ent., 33: 11, 36-37; Linsley, MacSwain, and Raven, 1964, Univ. California Publ. Ent., 33: 72-73.

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baileya sp @ BBSL (4)
Brassicaceae  Lesquerella sp @ BBSL (1)
Lamiaceae  Salvia sp @ BBSL (2)
Malvaceae  Sphaeralcea ambigua @ BBSL (1)
Onagraceae  Camissonia sp @ BBSL (6)

Oenothera sp @ BBSL (10)

Oenothera sp_( @ BBSL (2)
_  Withheld @ BBSL (4)

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Updated: 2021-05-13 13:35:38 gmt
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