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Andrena baeriae Timberlake, 1941
Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Hesperandrena

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Text used courtesy of the Illinois Natural History Survey from: Thorp, R. W., LaBerge, W. E., 2005. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XV. Subgenus Hesperandrena. Illinois Natural History Survey Bulletin 37: 65-93.

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Andrena baeriae differs from females of the preceding species by the distinct pronotal angles and lateral ridges. As in lativentris the integument is black (occasional slight metallic tints may be present on the frons) .mil the facial fovea is broad, being separated from the lateral ocellus by less than one ocellar diameter. The female is often marked with brown hairs posteromedially on the mesoscutum and medially on the scutellum, as well as on the face along the inner margins of the eyes. The male of baeriae has (Pig. 10) pronotal angles and ridges (the integument posterior to the lateral ridge is frequently less shagreened and moderately shiny) and has sterna 2-5 with weakly formed subapical fimbriae of long hairs as described below.

FEMALE. MEASUREMENTS AND RATIOS. N = 5; length, 8.5-10.0 mm; width, 2.53.0 mm; WL, M = 2.72 0.159 mm: FL/FW. M = 0.91 0.013; FOVL/FOVW, M = 1.90 0.045 mm.

INTEGUMENTAL COLOR. Integument black except as follows: Irons above antennal fossae occasionally with slight metallic tints; mandibles with apical hyaline, veins red to reddish brown; metasomal terga narrowly hyaline apically, becoming dark towards base of apical area; tibial spurs pale yellow.

STRUCTURE. Antennal scape length about equal to first four flagellar segments; flagellar segment 1 as long as segments 2 plus 3, which are equal in length; segments 5-7 quadrate. Eyes each about four times as long as broad, inner margins parallel. Mandibles apposed, short, with subapical tooth. Malar space and galeae as in escondida. Maxillary palpus as in escondida but segmental ratio about as 0.8:1.0:0.7:0.6:0.5:0.6. Labial palpus as in escondida but ratio about as 1.0:0.5:0.6:0.6. Labrum as in escondida but usually gently emarginate apically. Clypeus, supraclypeal area and face above antennal fossae as Fig. 2. Map showing the known distribution of A. lativentris, A. baeriae, and A. eremophila, n. sp.

in escondida. Facial fovea broad, separated from lateral ocellus by one ocellar diameter or somewhat more, extending below to well beyond a line across lower margins of antennal fossae. Gena! area in profile almost one and one-half times as broad as eye, surface dull, shagreened.

Pronotum with humeral angles and lateral ridges (Fig. 10). Mesoscutum dull, tessellate, punctures sparse and obscure. Mesoscutum dull, tessellate, punctures sparse and cure. Scutellum similar. Propodeum and pleurae as in escondida.

Metasomal terga sculptured as in escondida. Pygidial plate as in escondida, without raised rim in specimens at hand. Sterna 2-5 sculptured as in escondida.

VESTITURE. White to pale ochraceous except as follows: along inner margins eyes and upper face dark ochraceous to brown; facial fovea with tomentum dark brown; mesoscutum and scutellum often with pale yellow hairs; apices of femora and tibial plates occasionally with brown hairs; terga 5 and 6 with brown hairs at least medially; tarsi with inner surfaces with pale yellow hairs. Mesoscutum and scutellum with hairs mostly longer than width of flagellum, relatively sparse; metasomal tergum 2 with apical pale fascia interrupted medially. Pollen collecting hairs as in escondida.

MALE: MEASUREMENTS AND RATIOS. N = 11; length 6-8 mm; width, 1.5-2.0 mm; WL, M = 2.27 0.370 mm; FL/FW. M = 0.95 0.026; FS1/FS2, 2.24 0.026.

INTEGUMENTAL COLOR. As in female except as follows: terga 2-5 with apical areas more broadly hyaline apically, often half of apical area colorless; tergum 2 laterally usually with small, subapical, yellow spot surrounded by rufescent border, terga 1 and 3 rarely with similar spots but usually rufescent or reddish brown and without yellow.

STRUCTURE. Antennae short, female-like; flagellar segment 1 twice as long as segment 2, which is about as long as segment 3 and broader than long; segments 4-7 about as long as broad; scape length as in female. Eyes each about three and one-half times as long as broad or slightly longer, inner margins diverging towards vertex. Mandibles slightly decussate, short, with subapical tooth. Galeae as in female. Maxillary palpus as in female but ratio about as 0.8:1.0:0.8:0.5:0.5:0.6. Labial palpus as in female but ratio about as 1.0:0.5:0.4:0.5. Labral process and labrum as in escondida. Clypeus sculptured as in female but punctures slightly denser, separated largely by one to two puncture widths or less. Supraclypeal area as in female. Face above antennal fossae with rugulae as in female but diverging upward immediately below ocelli. Vertex and genal area as in female.

Pronotum with distinct humeral angles and lateral ridges, surface dulled by shagreening anterior to lateral ridge and shiny to moderately shiny posterior to ridge. Thoracic sculpturing as in female.

Metasomal sculpturing as in female but terga 1-5 slightly shinier. Sterna as in female. Sterna 7 and 8 small, sternum 7 (Figs. 13, 28) with emargination relatively deep and narrow, sides angulate near the apical margin; sternum 8 (Fig. 29) much as in lativentris but much smaller and narrower.

VESTITURE. White to pale ochraceous but inner surfaces of tarsi pale yellow. Metasomal terga 2-5 with weak apical pale fasciae, those on terga 2 and 3 interrupted medially often by one-third width of tergum or more. Sterna 2-5 with distinct subapical fimbriae of long, curled, sparse hairs, individually each separated by two or more hair-widths so that distinct dense white bands not formed (as in lativentris).

TYPE MATERIAL. The holotype female (CAS No. 14,349) of baeriae was collected from flowers of Baeria chrysostoma var. gracilis and B. aristata at Riverside, California, from March 29 to April 6 by P.H. Timberlake.

DISTRIBUTION. Andrena baeriae is known (Fig. 2) from San Diego County north to Yolo County, California. It has been collected from March 3 to July 5, but chiefly in late March into May. A total of 94 females and 16 males from the localities listed below (including records from the literature) were examined. La Mesa, San Diego County listed below is the probable locality for a single male labeled as from La Mesa, in Baja California, Mexico. However, the authors cannot find such a locality in Baja California. La Mesa in San Diego County, California, on the other hand, lies about 3 miles east of the San Miguel Mission in San Diego County which is mentioned on the original label and also not far from San Miguel Mountain. We conclude that an error was made on the hand-written label by the collector (T.D.A. Cockerell).

CALIFORNIA. KERN CO.: Rosamond (hills Not). FRESNOCO.: Mendota. LOS ANGELES CO.: Puente Hills; Santa Catalina Island; Whittier. NAPA CO.: Aetna springs (N. of Butts Canyon). RIVERSIDE CO.: Gavilan; Lake Perris; Riverside; Sta. Rosa Plateau Reserve (WSW of Murrieta). SACRAMENTO CO.: Folsom. SAN BENITO CO.: Hollister (35 mi. S). SAN BERNARDINO CO.: Morongo Valley. SAN DIEGO CO.: Lake Cuyamaca; La Mesa (3 mi. E of San Miguel Mission). SANTA BARBARA CO.: Christi Beach, Sta. Cruz Island. SOLANO CO.: Dixon (9 and 11 mi. S). YOLO CO.: Davis.

FLORAL RECORDS. Andrena baeriae is probably an oligolege of flowers of the genus Baeria but little is actually known of its pollen preferences. It has been collected from flowers of the plants listed below (including records from the literature): Baeria sp., B. aristata, B. chrysostoma var. gracilis, Layia sp., L. chrysanthemoides.

Scientific source:

Andrena baeriae Timberlake, 1941, Bull. Southern California Acad. Sci., 39:194. Andrena (Hesperandrena) baeriae: Lanham, 1949, Univ. California Publ. Ent., 8:208.

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Baeria sp @ BBSL (1)

Baeria @ AMNH_BEE (1)

Lasthenia aristata @ UCRC_ENT (5)

Lasthenia californica @ BBSL (1)

Lasthenia gracilis @ UCRC_ENT (45)

Lasthenia @ UCRC_ENT (19)
Boraginaceae  Cryptantha intermedia @ UCRC_ENT (2)
_  Withheld @ BBSL (2)

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Updated: 2024-04-14 22:59:28 gmt
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