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Extracted from: Snelling R.R., (1966). Studies on North American Bees of the Genus Hylaeus 2. Description of a New Subgenus and Species (Hymenoptera: Colletidae), Los Angeles County Meseum Vol. 76, pp. 139-144.
Superficially the female resembles H. wootoni (Cockerell), but it is easily separated from this, and all other Nearctic Hylaeus by the com- bination of maculate clypeus, extremely coarse thoracic punctures and transverselyrugulosebasalpropodealarea. Themalemayberecognized among the superficially similar small species by its distinctiy and coarsely punctate clypeus, coarsely pimctate thorax, transversely rugulose basal propodeal area and details of ventrites VIII and IX.
Male (composite description): Integimient black, except for dull yellow maculae as follows: mandibles, except ferruginous apices; labriim; clypeus; supraclypeal spot; paraocular areas, extending nar- rowly along inner orbits to level a httle below midpoint between an- teimal sockets and median ocellus (Fig. lA); medially interrupted stripe on pronotal collar; pronotal tubercules largely; spot on tegulae; small to minute apical spot on all femora; fore tibiae, except irregular brownish blotch on posterior surface; basal one-fourth and small apical spot on middle tibiae; basal one-third and small apical spot on hind tibiae; all basitarsi. All medio- and distitarsi ferruginous yellow. Tarsal claws ferruginous apically, yellow basally as are tibial spurs. Wings clear hyaline, veins and stigma brownish. Pubescence whitish, sparse, except on underside of head where it is relatively long and abundant.
Head: UFD 0.79 X FL; LFD 0.58 X UFD; OCD 1.13 X TFD; clypeus shghtly wider basally than distance between laterobasal angle and eye margin; distance between anteimal sockets almost twice a socket diameter, the latter about equal to distance from socket to eye margin; clypeus and supraclypeal area dull, densely tessellate, with large, conspicuous punctures separated by about a punctinre diameter; macu- late lateral areas a httle shinier, punctation as on clypeus; immaculate areas dull, densely, coarsely punctate; genae dull, densely punctate, punctures smaller than those of vertex, more obscure. First flagellar segment subequal to pedicel, minimum length a little more than half its breadth, maximum length almost equal to minimum length of second.
Thorax: Outer margin of fore coxa slightly convex to straight; meso- pleural punctures very coarse, close, interstices densely tessellate, slightly shining; mesoscutal punctures coarser, subcontiguous, interstices less shining than those of mesopleurae; mesoscutellar punctures equal to those of mesoscutum, more separated, interstices shinier; metanotum dull, densely tessellate, with coarse, close, deep punctures; basal area of propodeum rugulose, the rugae variable, but usually distinctly trans- verse; remainder of propodemn, including posterior face, densely, distinctly punctate; oblique carina absent, lateral carina obliterated above lower one-fifth.
Abdomen: Tergite I shining, punctures fine, separated by a puncture diameter or a Httle more; tergite II duller, more distinctly tessellate, with finer, more obscure punctures, mostly separated by more than a puncture diameter; tergites III-VI similar to II, with pillferous punc- tures a httle larger, but more obscure than those of II; ventrites VIII, IX and genitaha as in Fig. 1 C-E.
Measurements: Body length (front of vertex to apex of second ter- gite), 3.2 to 4.0 mm; forewing length, 2.9 to 3.6 rom.
Female: Integument black, except dull yellow as fllows: elongate median mark on clypeus; irregular supraclypeal spot (absent in some paratypes); paraocular area, extending along inner eye margin to level midway between antennal sockets and median ocellus (Fig. IB); medially interrupted pronotal stripe; pronotal tubercules largely; spot on tegulae; basal one-third of fore and hind tibiae; basal one-fourth of mid tibiae; tibial spurs. Wings as in male. Pubescence light, sparse.
Head: UFD 0.81 X FL; LFD 0.65 X UFD; OCD 0.92 X TFD; cljTpeus a little wider basally than distance from latero-basal angle to inner eye margin; distance between antennal sockets slightly greater than a socket diameter, the latter equal to distance between sockets and eye margin; clypeus and maculate areas dull, very densely tessellllate, with scattered shallow large punctures; immaculate areas a little shinier, subrugulose from coarse punctures; genae shghtly shining, with punctures a little finer than those of frons, more separated; facial foveae above hardly separated from eyes.
Thorax: Mesopleurae slightly shining, punctures very coarse, sub- contiguous to about one-half a puncture diameter apart; mesoscutal punctures coarser, subcontiguous; mesoscutellar punctures equal to those of mesoscutvun, slightly more separated; metanotal punctures equal to those of mesoscutmn, interstices dull, very densely tessellate; basal propodeal area distinctly transversely rugulose in most specimens, the rugulae extending onto the vertical face; remainder of propodeum distinctly, closely punctate; lateral carina absent above lower one-fourth or less; obhque carina absent.
Abdomen: Tergite I distinctly tessellate, shghtly shining, with fine punctures separated by about a puncture diameter; tergite II similar, but punctures much finer; remaining tergites similar to II.
Measurements: Body length (front of vertex to apex of second ter- gite), 3.5 to 4.8 mm; forewing, length, 3.2 to 4.5 mm.
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