Reprinted with permission of the American Entomological Society from:
Ribble, D. W. 1974. A revision of the bees of the genus Andrena of the Western Hemisphere. Subgenus Scaphandrena. Transactions of the American Entomological Society 100: 101-189.
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The females of this species lack toothed tarsal claws and are most closely related to A. walleyi. Andrena kaibabensis has a dark integument, longer clypeus, slightly coarser propodeum, slightly wider facial fovea and sparser punctures on the abdominal terga.
The description below is based mainly upon the holotype female. The male of this species is unknown.
FEMALE. — MEASUREMENTS AND RATIOS. — Length, 9.6 mm; width, 2.5 mm; wing length, 7.5 mm; FL/FW, 1.22; FOVL/FOVW, 5.00.
INTEGUMENTAL COLOR. — As in merriami.
STRUCTURE. — Antennal scape nearly as long as first four flagellar segments; flagellar segment 1 distinctly longer than segments 2 plus 3; antenna otherwise as in merriami. Eyes each about 3.7 times as long M broad, inner margins parallel. Mandible as in merriami. Galea as in merriami but much longer. Stipes with hooked hairs. Labial palpus as in merriami but ratio about 1.0:0.4:0.5:0.5. Maxillary palpus as in merriami but ratio about 0.7:1.0:1.0:1.0:0.7:1.0. Clypeus as in merriami but rather wide impunctate area along midline, shagreening absent in center. Supraclypeal area and face above antennal fossae as in merriami. Facial fovea narrow, not quite reaching lower margins antennal fossae, otherwise as in merriami. Vertex about as high as three-fifths ocellar diameter, otherwise as in merriami. Genal area as in merriami.
Pronotum, mesoscutum and scutellum as in merriami. Propodeum as in merriami but dorsolateral and posterior surfaces with slightly coarser shagreening. Wings as in merriami but vein 1st m-cu meets second submarginal cell before middle of cell, second submarginal cell slightly narrowed anteriorly. Tarsal claws untoothed, hind tibia as in merriami.
Metasomal terga as in merriami but pygidial plate without upturned margin. Sterna 2-5 as in merriami but punctures larger and closer.
VESTITURE. — As in merriami but vertex of head with amber hairs, thoracic dorsum with white hairs of moderate length.
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