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Andrena linsleyi Timberlake, 1937
Andrena enceliarum Cockerell, 1937; Andrena (Melandrena) linsleyi Timberlake, 1937

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 linsleyi is a relatively large Oenothera bee with sparse, long scopal hairs. a triangular labral process with rounded tip, and relatively weakly sculptured propodeum and mesepisterna. The male of linsleyi has the vestiture entirely white. Both sexes are marked by relatively sparsely punctate clypeus, scutellum and mesoscutum as described below.

FEMALE: MEASUREMENTS AND RATIOS. N = 20; length, 11-14 mm; width. 3.5-4.0 mm; WL, M = 4.10 0.145 mm; FL/FW, M = 1.12 0.004; FOVL/FOVW. M 3.12 0.032

DIAGNOSIS. Vestiture black; wing membranes hyaline, not infumate, veins reddish brown to dark brown; metasomal terga black without metallic reflections. Galeae moderately long, dulled by fine shagreening: labral process large, triangular with apex rounded, shiny, sides straight, entire. Clypeus with punctures separated by half to one puncture width or slightly more (especially near apex), with distinct, complete, median, impunctate line. shiny, unshagreened: vertex above lateral ocellus equals distinctly less than one ocellar diameter, never more; ocelli moderately enlarged. Pronotum as in oenotherae. Mesoscutum and scutellum with distinct punctures separated by half a puncture width or slightly more, surface dulled by fine shagreening. Propodeum with distinct dorsal surface; dorsal enclosure with relatively fine, irregular rugulae: surfaces outside of enclosure punctate, dulled by tessellation, rugulae extremely fine, if present. Mesepisterna with distinct punctures, especially in lower half, obscured by coarse tessellation. Terga 2-4 with punctures small, separated mostly by half to one puncture width or slightly more, surface shiny; apical areas finely punctate in basal half to two-thirds, punctures separated by half to two puncture widths, surfaces shiny. Thoracic dorsum with hairs longer than width of scape; propodeum without distinct corbicula laterally, hairs long and plumose; scopal hairs extremely long, simple and extremely 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 = 3.67 0.188 mm; FL/FW. M = 1.16 0.009: FS1/FS2, M = L33 0.020.

DIAGNOSIS. Vestiture white except hind tibiae with inner surfaces yellow. Wing membranes hyaline, veins dark brown lo black: metasomal terga black, without metallic reflections. Galeae as in female; labral process large, emarginate apically, slightly reflexed; vertex above lateral ocellus equals less than one ocellar diameter; flagellar segment 1 longer than segment 2 and usually slightly longer than segment 3. Pronotum as in oenotherae female; mesoscutum with punctures separated mostly by half a puncture width, surface dulled by fine, regular shagreening; scutellum similar but punctures separated by slightly more than half a puncture width, especially anteriorly and surface often somewhat shiny in apical half; propodeum and mesepisterna sculptured as in female. Metasomal terga 2-5 sculptured as in female terga 2-4 but punctures usually slightly more crowded, shiny. Metasomal tergum 2 with basal area hairs short, erect; hind tibiae with outer surface hairs long as in oenotherae. Sterna 7 and 8 closely resemble those of blaisdelli. Sternum 7 with somewhat blunted apical lobes and relatively weak emargination; sternum 8 distinctly capitate with moderately dense hairs (Figs. 51 and 52).

TYPE MATERIAL. The holotype female (CAS No. 14, 363) of Andrena (0). linsleyi was collected 2 miles N of Palm Springs, Riverside County, California, on flowers of Hyptis emoryi (not collecting pollen) March 7, 1936, by P. H. Timberlake. The holotype male (AMNH) of A. (O.) enceliarum was collected at Dublin, Arizona, March 7, 1937, from flowers of Encelia sp. by T.D.A. Cockerell

DISTRIBUTION. Andrena linsleyi is known to occur in southern California, southern Nevada, western Arizona and Sonora, and Baja California del Norte in Mexico (Linsley, MacSwain, and Raven, 1963. p. 12) (Fig. 2). It has been collected from February 15 through April 26. In addition to the type material, a total of 1, 077 females and 205 males were examined from localities listed below (including localities reported in the literature). ARIZONA. GRAHAM CO.: Dublin. MOHAVE CO.: Topok (3.5 mi. S). YUMA CO.: Quartzite (12mi.E). CALIFORNIA. KERN CO.: Boron; California City. IMPERIAL Co.: Glamis (2 mi. N); Kane Springs; Paloverde (3 mi. S). RIVERSIDE CO.: BIythe (18 and 19.4 mi. W); Hopkins Well; Indio; La Quinta; Palm Canyon; Palm Desert; Palm Springs (2 mi. N); Salton Sea; Thousand Palms. SAN BERNARDINO CO: Apple Valley; Baker (9 mi. S, Zzyzx Springs); Essex (and 2 and 3 mi. S and 10 mi. S), Kelso Dunes; Needles (near); Twenty-Nine Palms (and 29 mi. E). SAN DIEGO CO.: Anza (Coyote Canyon); Borrego, Borrego-Springs; Borrego State Park (Coyote Creek); Borrego Valley (Palm Canyon); Costillo-Borrego; Jacumba (15 mi. E); Ocotillo-Borrego. NEVADA. CLARK CO.: Glendale; Mesquite (8 mi. W); Mormon Mesa; Sandy. MEXICO. SONORA: Sonoyta (81 mi. S). BAJA CALIFORNIA DEL NORTE. Osoyoos (Richter Pass Road).

NEST BIOLOGY. Nests of A. linsleyi are initiated in declivities (Linsley et al. 1963a). Their burrows descend vertically from a concentric tumulus.

FLORAL RECORDS. An excellent summary of the floral activities of Andrena linsleyi is detailed in Linsley, MacSwain, and Raven (1963, pp. 11-16). This species is an oligolege of Oenothera, having been collected most frequently from flowers of O. deltoides. It has been collected from flowers of the plants listed below.

Baileya sp., B. pleniradiata, Camissonia clavaeformis aurantiaca, C. c. clavaeformis, Dithyrea californica, Encelia sp., C. boothii desertorum, Dithyrea californica, Encelia sp., E. farinosa, Geraea canescens, Hyptis emoryi, Oenothera sp., O. deltoides deltoides, Palafoxia arida (as linearis).

Identification
This is another derivative of the blaisdelli group, and differs from blaisdelli and oenotheroe in having a clypeus much more sparsely punctured, the process of labrum differently shaped, and the mesoscutum distinctly less dull and more distinctly punctured. The scopa of hind tibiae is also much thinner than in either of those species.

Female. Black, with entirely black hair. Head and foveae as in oenotherae. Clypeus more produced than in blaisdelli, and the malar space less linear. Clypeus convex, polished, sparsely punctured, with little or no indication of a medium smooth line, the punctures becoming closer on the lateral margins. Sides of face below antennae very finely and densely punctured. Frons longitudinally striate on each side and rugulose in middle. Process of labrum triangular, rather broader at base than high, and with apex of the triangle narrowly truncated. Third antennal joint about equal to the next two combined. Flagellum dark reddish brown beneath. Mesosutum dullish, finely and closely punctured, the punctures on posterior middle of disk about one to two puncture widths apart with the inter spaces very minutely tessellate. Scutellum similarly punctured and rather shiny at base. Mesopleura somewhat duller than the scutum and more obscurely punctured. Basal enclosure of propodeum well defined and finely rugose as in blaisdelli. The remainder of dorsal surface of propodeum very finely grainular-rugulose and obscurely punctured. Sides of propodeum below the floccus slightly dullish, hairy but without distinct punctures. Wings hyaline, clearer than in blaisdelli, the venation and stigma nearly black. Abdomen shining punctured almost as closely as in blaisdelli, but a little more finely on the first tergite. Punctureless apical margin of tergites 2 to 4 rather wide as in blaisdelli, but very narrow on 1. Pubescence in general as in blasidelli and oenotherae, but hair of clypeus thinner and the scopa of hind tibiae remarkably long and loose. Length, about 12 mm.; fore win, 8.5 mm.

Holotype female, from two miles north of Palm Springs, Calif., on Hyptis emoryi (not collecting pollen) March 7, 1936 (Timberlake). One female (paratype) Colorado Desert, near Needles, March 6, 1930 (E. G. Linsley), in the Linsley collection. The paratype differs slightly in having the legs especially femora, the venter, the hair on under side of tarsi and the veins and stigma more reddish.

Names
Scientific source:

References
Andrena linsleyi Timberlake, 1937. Pan-Pacific Ent., 13: 71-72; Linsley, 1938, Proc. California Acad. Sci., Ser. 4, 23: 266, 278.

Andrena (Melandrena) linsleyi: Lanham. 1949. Univ. California Publ. Ent., 8: 221; Linsley and MacSwain, 1955. Pan-Pacific Ent., 31: 165, 166. 170-171; Linsley, MacSwain, and Smith, 1955, Pan-Pacific Ent., 31: 176, 179.

Andrena (Onagrandrena) linsleyi: Linsley and MacSwain, 1956, Pan-Pacific Ent., 32: 112; Linsley, MacSwain, and Raven, 1963. Univ. California Publ. Ent., 33(1): 11-16; Linsley, MacSwain, and Raven, 1964. Univ. California Publ. Ent., 33(2): 73.

Andrena enceliarum Cockerell, 1937, American Mus. Novs. No. 948, p. 13.

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baileya sp @ BBSL (7)

Geraea canescens @ BMEC_ENT (1)
Fabaceae  Astragalus @ BMEC_ENT (1)
Hydrophyllaceae  Phacelia sp @ BBSL (1)
Onagraceae  Oenothera sp @ BBSL (10)

Oenothera @ AMNH_BEE (97); BMEC_ENT (5)
_  Withheld @ BBSL (11)

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Updated: 2021-06-13 21:49:40 gmt
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