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 small dark species from California can be distinguished from either berberidis or caliginosa by the distinctly longer malar spaces of both sexes. In addition, the male of submaura has considerable dark vestiture, as in caliginosa but unlike berberidis, and lacks the trochanteral finger-like apical processes present in caliginosa males. The female has the clypeus protruding beyond a line at the lower margins of the compound eyes by half or less than half of the median clypeal length and has a sharply pointed galea.
FEMALE. MEASUREMENTS AND RATIOS: N = 20; length, 9-11 mm; width, 2.0-3.5 mm; wing length, M = 3.91 ± 0.183 mm; FL/FW, M = 1.06 ± 0.005; FOVL/FOVW, M = 3.48 ± 0.054.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half to third rufescent; wing membranes hyaline, veins dark brown to black; tergal apical areas occasionally with slightly rufescent reflections; sterna with rufescent reflections; tibial spurs piceous.
STRUCTURE. — Antennae as in caliginosa. Eyes each about three and one-fourth times as long as broad, inner margins parallel. Malar space elongate, minimum length slightly less than basal mandibular width. Glossa shorter than clypeus, broad at base, acuminate and narrow in apical third or less, pointed. Galea sharply pointed, outer apical margin straight or slightly concave, shorter than midclypeal length; surface shiny. Maxillary palpus as in berberidis, but segmental ratio about 0.8:1.0:0.8:0.8:0.6:0.5. Labial palpus as in berberidis, but ratio about 1.0:0.5:0.5:0.4. Labral process long, trapezoidal, narrow, minutely emarginate apically or entire, depressed across base; labrum apical to process about as long as process, with small depression at tip of process, with median crista apical to depression, flat to slightly convex laterally. Clypeus as in caliginosa; in facial view protrudes beyond a line at lower margins of eyes by half its length or slightly less. Supraclypeal area with minute well-separated punctures and fine shagreening moderately dulling surface. Face above antennal fossae, facial fovea, vertex, and final area as in caliginosa.
Pronotum as in caliginosa, but humeral angles slightly more distinct. Mesoscutum and scutellum sculptured as in caliginosa, but mesoscutal posteromedian area and anterior half of scutellum with punctures slightly sparser and surfaces usually shiny. Propodeum and mesepisternum as in caliginosa. Metasomal terga and sterna sculptured as in caliginosa. Pygidial plate as in caliginosa.
VESTITURE. — Entirely black except hind tibial scopal hairs often slightly paler, dark brown. Form and distribution of hairs as in caliginosa except propodeal corbicula formed as in berberidis.
MALE. MEASUREMENTS AND RATIOS. — N = 4; length, about 10 mm; width, about 2.5 mm; wing length, M = 3.66 ± 0.276 mm; FL/FW, M = 1.01 ± 0.003; FS1/FS2, M = 2.47 ± 0.040.
INTEGUMENTAL COLOR. — As in female, but clypeus pale yellow except narrow apical margin, lateral angles, and small triangular maculae below tentorial pits.
STRUCTURE. — Antennal scape length about equal to first two flagellar segments; flagellar segments as in caliginosa. Malar space, glossa, galea, maxillary palpus, and labial palpus as in female. Labral process broader than long, entire, weakly reflexed, shiny; labrum apical to process longer than process, convex or flat, shiny, impunctate except in narrow basal zone. Clypeus about as long as in female, protuberant, with small round punctures irregularly separated by one to three or four puncture widths, surface shiny. Supraclypeal area, face above antennal fossae, and vertex as in female. Genal area in profile angulate posteriorly, almost as broad as twice eye width, sculptured as in female.
Thoracic form and sculpturing as in female. Metasomal terga sculptured as in female. Tergum 7 with pseudopygidial area narrow, pointed. Sterna 2-6 as in berberidis. Penis valves long and more pointed than in berberidis or caliginosa; dorsal lobe of gonocoxite as in caliginosa. Sternum 7 sharply bidentate apically. Sternum 8 not emarginate apically (Figs. 22-26).
VESTITURE. — As in caliginosa, but sterna 2-5 without subapical fimbriae.