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Extracted from Snelling R.R., (1966). Studies on North American Bees of the Genus Hylaeus. 1. Distribution of the Western Species of the Subgenus Prosopis With Descriptions of New Forms (Hymenoptera: Colletidae). Los Angeles County Museum of Natural History
This new species does not seem to be closely allied to any of the Nearctic species of the subgenus Prosopis, and differs from the other western species in several characters. In the male the face is broader above so that the inner orbits are more strongly convergent below; the thoracic punctures are much coarser and better defined; the post-scutellum is distinctly punctate; ter-gites II-VI are impunctate, transversely lineolate; ventrites VIII and IX are as illustrated. The female may be recognized by the broad face, the vertical median clypeal stripe, the presence of the supraclypeal mark, the facial foveae ending at the midpoint between the eyes and ocelli and the distinctly, closely punctate post-scutellum.
Male: Integument black, the following dull lemon-yellow: mandibles, except piceous to ferruginous apical one-fifth; labrum; clypeus, except piceous apical margin; paraocular areas; stripe extending broadly along lower three-fourths of inner eye margin; large supraclypeal spot (fig. 3C); narrow stripe on pro-notal collar, broadly interrupted medially; entire pronotal tubercules; large spot on tegulae; small apical spot on fore femora; anterior tibiae, except narrow dark stripe on inner surface; outer, basal half of middle and hind tibiae; all basitarsi. The following clear ferruginous-yellow: narrow stripe on underside of antennal scape; underside of all flagellar segments; extreme apex of all basi-tarsi; all medio- and distitarsi; tarsal claws; tibial spurs. Pubescence of head and thorax sparse, long, whitish; of abdomen sparse, shorter, tending to form apico-lateral fasciae on tergites I and II. Wings hyaline, slightly brownish, veins and stigma brownish-ferruginous.
Head. UFD 0.95 x FL; LFD 0.66 x UFD; OCD 0.78 x TFD; clypeus as wide basally as distance between latero-basal clypeal angle and inner eye margin; distance between antennal sockets slightly greater than a socket diameter, subequal to distance between sockets and eyes; clypeus dull, densely tessellate, punctures fine, scattered, obscure; supraclypeal area dull, densely tessellate, with scattered punctures a little coarser than those of clypeus; lateral, maculate, areas of face tessellate, a little shinier than clypeus, with scattered punctures equal to those of supraclypeal area; nonmaculate areas of face and vertex appearing rugose from large, dense punctures; genal punctures smaller, well-separated; antennal scape 0.60 times as broad as long; minimum length of first flagellar segment less than breadth; maximum length of first flagellar less than minimum length of pedicel or second flagellar.
Thorax. Outer margin of fore coxa straight; mesopleural punctures coarse, subcontiguous, interstices tessellate, slightly shining; mesoscutal punctures sub-equal to those of mesopleurae, subcontiguous, becoming slightly more separated posteriorly; mesoscutellar punctures a little finer, more separated than those of mesoscutum; metanotum densely tessellate with distinct subcontiguous punctures equal to those of mesoscutellum; basal area of propodeum broad, inner striae longitudinal, outer transverse or largely so; lateral and latero-basal areas distinctly punctate.
Abdomen. Tergite I shining, punctures fine, mostly separated by about a puncture diameter; tergite II duller, punctures of disc much finer than those of tergite I; tergites III-VII, dull, transversely lineolate, impunctate; ventrites VIII and IX as illustrated (Fig. 3, E, F).
Measurements. Body length (front of vertex to apex of tergite II), 5.9 to 6.7 mm.; forewing length 4.8 to 5.8 mm.
Female: Integument black, following dull lemon-yellow: Broad longitudinal median clypeal stripe; variable supraclypeal spot; paraocular areas and along lower three-fourths of inner eye margin (Fig. 3D); narrow, medially interrupted stripe on pronotal collar; pronotal lobes largely; spot on tegulae and post-tegulae; basal spot on fore and middle tibiae; basal one-fourth to one-third of hind tibiae. Tibial spurs and tarsal claws ferruginous yellow. Tarsal segments rufescent. Wings and pubescence as in male.
Head. UFD 0.81 x FL; LFD 0.85 x UFD; OCD 0.64 x TFD; basal clypeal width about 1.5 times distance between laterobasal angle and eye margin; diameter of antennal sockets slightly less than half distance between sockets, about two-thirds distance between sockets and eye margins; clypeus and macu-late areas of face dull, densely tessellate, with scattered obscure punctures; non-maculate areas with punctures coarse, contiguous; genal punctures fine, separated by about a puncture diameter; first flagellar segment longer than second; facial foveae widely removed from eye margin above, ending at or near midpoint between eyes and lateral ocelli.
Thorax. As described for male except that metanotal punctures are much finer than those of mesoscutellum
Abdomen. Tergite I shining, finely punctate, the punctures mostly sepa-rated by about a puncture diameter; tergite II transversely lineolate, with scattered minute punctures; tergite III-VI transversely lineolate, impunctate.
Measurements. Body length (front of vertex to apex of tergite II), 6.2 to 7.2 mm.; forewing length, 4.8 to 5.9 mm.
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