Reprinted with permission of the American Entomological Society from:
LaBerge, W. E., Ribble, D. W. 1975. A revision of the bees of the genus Andrena of the Western Hemisphere. Part VII. Subgenus Euandrena. Transactions of the American Entomological Society 101: 371-446.
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This small species from California and Oregon is known only in the female sex. These females are very much like those of misella in the form of the scopa and propodeal corbicula. The penemisella females most closely resemble the palest misella females or pale suavis females in that the vestiture is generally pule and terga 2-4 have distinct but narrow pale apical fasciae. The female of penemisella is like that of suavis and differs from that of misella by the longer, narrower labral process, the form of the pygidial plate and the faint metallic green integument and faint violaceous clypeal reflections.
Andrena penemisella could be regarded as a hybrid between suavis and misella, as the characters seem to be a combination of the characters of the latter two species. However, the characters of penemisella appear to be consistent without intergrades with either of the other two species and the range of penemisella is greater than that of misella. It seems best to treat these females as representing a distinct species until more information accumulates.
FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 7-8 mm; width, 2-3 mm; wing length, M = 2.99 ± 0.158 mm; FL/FW, M = 0.96 ± 0.006; FOVL/FOVW, M = 4.19 ± 0.095.
INTEGUMENTAL COLOR. — Generally black with faint metallic green or greenish-blue reflections, clypeus with faint violaceous reflections; otherwise as in caerulea.
STRUCTURE. — Antenna as in caerulea but scape as long as first four flagellar segments or slightly longer. Eye, mandible and galea as in caerulea. Maxillary palpus as in caerulea but segmental ratio about as 0.9:1.0:0.9:0.7:0.5:0.7. Labial palpus as in caerulea but ratio about as 1.0:0.4:0.3:0.4. Labium, supraclypeal area, face above antennal, facial fovea, vertex and genal area as in caerulea.
Thoracic sculpturing and structure as in caerulea except as follows: hind wing with vannal lobe narrow as in misella; hind tibia moderately narrow as in misella, not cuneate.
Terga sculptured as in misella. Pygidial plate V-shaped with rounded apex and gently but distinctly raised internal longitudinal ridge (much as in caerulea and suavis}. Sterna as in caerulea.
VESTITURE. — Generally white to ochraceous with abundant dark brown to black hairs on face (especially along inner margins of compound eyes), on vertex, and in facial foveae. Thoracic hairs pale except occasionally (not in holotype) with a few to several dark hairs mixed with pale on upper part of mesepisternum and dorsal hairs ochraceous to pale fuscous. Terga 2-4 banded as in suavis but bands narrower; hair generally long and pale as in suavis. Pollen-collecting hairs of legs and propodeum as in misella.
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