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Extracted from P. H. Timberlake. A REvisonal Study of the Bees of the Genus Perdita F. Smith, with Special Reference to the Fauna of the Pacific Coast ( Hymenoptera, Apoidea Part V). University of California Press Berkeley and Los Anggeles 1962
P. vicina is rather similar to amplipennis and closely allied, but its mesonotum is distinctly tessellate and somewhat dullish, and its abdomen is dark, with an interrupted pale-yellow band on the second and third segments. It is known only from a single male taken in the Charleston Mountains of Clark County, Nevada.
Male.—Head and thorax dark green; more bluish on propodeum; middle of disk of mesoscutum and scutellum black with slight brassy luster. Anterior third of cheeks and gular region, mandibles except reddish apical third, labrum, face below antennae with lateral mark reaching obliquely to f oveae, scape of antennae, and flagellum beneath, yellow. Thorax dark except yellow tubercles and lower end of flanks of pronotum. Abdomen fuscous above, more brownish on apical margin of segments and orange yellow beneath; pale-yellow band at base of tergites 2 and 3, narrowly interrupted on tergite 2 and broadly on tergite 3. Legs dark; anterior side of femora and of front and middle tibiae, trochanters and coxae, line on anterior side of hind tibiae, and front tarsi, yellow. Pedicel and flagellum of antennae above, fuscous, becoming more brownish toward apex. Proboscis dark. Tegulae subhyaline with fuscous base. Wings whitish hyaline, nervures pallid, subcosta and margins of stigma brown.
Head large, subquadrate; cheeks broad, slightly dentate anteriorly. Occipital concavity broad and moderately deep. Mandibles long, slender, very acute at apex, and quadrately expanded on outer margin at base. Facial foveae faint, about twice as long as wide. Flanks of pronotum well impressed, posterior corners of disk rounded and rather prominent. Pterostigma somewhat morethan half as wide as first submarginal cell; parts of marginal cell beneath and beyond it equal. Tarsal claws strongly bent and deeply bifid, inner tooth not much shorter than outer. Head and thorax minutely tessellate: tessellation strong on rather dull f rons and vertex; weaker on moderately dullish thorax j face below antennae smooth. Puncturation very fine, obscure, and sparse, distinct only on mesoscutum. Pubescence thin, whitish, erect: moderately long on face and meso-notum; longer and denser on cheeks and underparts of thorax. Sides of tergite 7 converging evenly to rounded apex, as in amplipennis. Subgenital plate broader and more rounded at apex than in lateralis and amplipennis. Dorsal lobes of caulis rounded at apex, with deep, parallel-sided, and apically rounded sinus between them; volsellae well exposed in dorsal view; parameral lobes long, very slightly clavate and incurved; sagittae a little more strongly fusiform than in amplipennis, but otherwise similar. Length: 4 mm.; anterior wing, 3.4 mm.
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