Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1985. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XI. Minor subgenera and subgeneric key. Transactions of the American Entomological Society 111: 440-567.
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This is the most primitive member of the subgenus Dactylandrena. The malar space in A. berberidis is not elongate, as in most other members of the subgenus Dactylandrena, but is similar to the condition found in most species of Andrena s. str. The female of berberidis looks much like a normal Andrena s. str.; however, the propodeal corbiculum is poorly formed; the tibial scopal hairs are long, simple, and sparse; and the labrum apical to the process is formed into a shallow transverse sulcus. In addition, both sexes have relatively poorly formed pronotal angles and ridges, and the front wing has the base of vein M interstitial with vein cu-v or basad of cu-v (in most species of Andrena, M is distad of cu-v). The male, like other members of this subgenus, is marked with a yellow clypeus and long first flagellar segment.
FEMALE. MEASUREMENTS AND RATIOS: N = 14; length, 10-13 mm; width, 3.0-3.5 mm; wing length, M = 4.16 ± 0.225 mm; FL/FW, M = 0.99 ± 0.005; FOVL/FOVW, M = 3.67 ± 0.059.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half or slightly less rufescent; malar area and lower facial areas often with rufescent reflections; tegula translucent, brown; wing membranes moderately infumate, yellowish-brown, veins dark brown to reddish-brown; tergal apical areas and sterna usually with rufescent reflections; tibial spurs piceous; legs piceous to dark rufescent.
STRUCTURE. — Antenna! scape as long as first three and one-half flagellar segments; flagellar segment 1 as long as following three segments or almost so; segment 2 broader than long and slightly shorter than 3; segment 3 about as long as broad and slightly shorter than 4. Eyes each about two and two-thirds times as long as broad, inner margins parallel to converging extremely slightly toward vertex. Malar space with minimum length short. Outer mandible when closed extends beyond midlabrum by about one-fourth its length, apically bidentate, without tooth or angle on basal inferior margin. Galea with outer margin straight; surface shiny, without shagreening except lightly near top. Maxillary palpus longer than galea by slightly more than last two segments; segmental ratio about 1.0:0.8:0.6:0.6:0.5:0.6. Labial palpus with first segment long, curved, slightly flattened; segmental ratio about 1.0:0.7:0.6:0.7. Labral process weakly bidentate and narrowed apically, strongly depressed across basal half; labrum apical to process with distinct transverse sulcus crossed by a strong median crista. Clypeus moderately flattened, not much protuberant; punctures coarse, deep, irregular in size, separated mostly by half a puncture width; surface shiny, shagreening absent or weak except basally. Supraclypeal area small, dulled by coarse tessellation. Face above antennal fossae with coarse rugulae diverging strongly toward ocelli and obscure interrugal punctures, laterally near facial fovea with several rugulae paralleling fovea. Facial fovea narrow, (hallow, not extending below a line at lower margins antennal fossae, above I separated from lateral ocellus by one ocellar diameter. Vertex above lateral ocellus equal to about one ocellar diameter, dulled by fine dense tessellation and abundant small punctures. Genal area in profile distinctly broader than eye (about as 7:5); punctures sparse, extremely minute, surface moderately dulled by shagreening.
Pronotum with blunt humeral angle and dorsoventral ridge rounded its entire length; dulled by coarse reticular shagreening, punctures minute, obscure. Mesoscutum with distinct round punctures separated by half to one puncture width, sparser posteromedially, surface dulled by fine reticular shagreening. Scutellum with small round punctures separated mostly by half a puncture width or slightly more, surface shiny at least anteriorly. Propodeum with dorsal enclosure with fine irregular roughening across base and often almost to apex, surface tessellate; dorsolateral, posterior, and lateral surfaces tessellate, without obvious punctures. Fore ting with base of vein M interstitial with cu-v or basad of cu-v.
Metasomal tergum 1 with minute sparse punctures separated by four to five puncture widths or more, surface shiny, shagreening absent or extremely weak. Terga 2-4 similar to 1, but punctures progressively more crowded, on tergum 4 separated largely by three to four puncture widths. Pygidial plate V-shaped with rounded apex and distinct raised internal triangular area. Sterna 2-5 with basal areas sparsely punctate, narrow apical areas impunctate, surfaces dulled by fine dense reticular shagreening.
VESTITURE. — Black except dorsum of thorax ochraceous. Tibial scopal hairs sparse, long, simple; propodeum with corbicula not well formed, long dorsal plumose hairs not much longer than adjacent thoracic hair, not curled down, internal hairs moderately long, grading into dorsal fringe; trochanteral flocculus complete but weak. Tergal hairs erect to semi-erect, sparse, long on tergum 1.
MALE. MEASUREMENTS AND RATIOS. — N = 10; length, 9-11 mm; width, 2-3 mm; wing length, M = 3.86 ± 0.233 mm; FL/FW, M = 0.97 ± 0.005; FS1/FS2, M = 2.41 ± 0.102.
INTEGUMENTAL COLOR. — As in female except as follows: mandible with apical fifth or less rufescent; clypeus yellow except narrow apical margin, two triangular spots below tentorial pits, and narrow posterior margin; terga 1-5 with apical areas hyaline, colorless to yellow; sterna with apical areas hyaline, yellow; tibial spurs testaceous; tarsi dark rufescent to brown.
STRUCTURE. — Antennal scape as long as first two flagellar segments or slightly longer; flagellar segment 1 more than twice as long as segment 2 and as long as 2 plus 3 or longer; segment 2 as long as broad or shorter and shorter than 3 which is distinctly longer than broad. Malar space and galea as in female. Maxillary palpus as in female but segmental ratio about 1.0:0.8:0.8:0.8:0.6:0.8. Labial palpus as in female but ratio about 1.0:0.8:0.6:0.8. Labral process short, broad, bidentate, depressed across base; labrum apical to process flat, shiny, without crista. Clypeus with deep round punctures of irregular size (many large) separated irregularly by half to one and one-half puncture widths, without median impunctate line; surface shiny to lightly shagreened, especially basally. Supraclypeal area and face above antennal fossae as in female. Vertex as in female, but often slightly taller than one ocellar diameter. Genal area in profile distinctly broader than eye (about as 4:3), with rounded angle posteriorly, sculptured as in female.
Pronotum with rounded humeral angle and dorsoventral ridge as in female, surface posterior to ridge shagreened, but slightly shinier than anteriorly. Mesoscutum and scutellum as in female, but scutellum dull or shiny only along anterior margin. Propodeum as in female. Fore wing with base of vein M usually basad of vein cu-v, at most interstitial with cu-v.
Metasomal terga 1-5 sculptured as in female terga 1-4, but punctures slightly sparser. Tergum 7 with narrow, pointed, pseudopygidial area. Sterna 2-5 impunctate apically, basal area with small sparse punctures separated by five to six puncture widths or more, surface reticularly shagreened. Sternum 6 flat, broadly and shallowly emarginate. Penis valves blunt at tips; dorsal lobe of gonocoxite elongate. Sternum 7 narrowly bidentate apically. Sternum 8 capitate apically, weakly emarginate (Figs. 12-16).
VESTITURE. — Entirely ochraceous except as follows: face along inner margins eyes, vertex, and usually genal area along outer margins eyes with long black hairs; terga 3, 4, and 5 with basal area hairs occasionally brown in part. Hairs in general long, sparse; terga without apical pale fasciae; sterna 2-5 with weak subapical fimbriae.