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Extracted from: Timberlake P.H., (1969). A Contribution to the Systematics of North America Species of Synhalonia (Hymenoptera, Apoidea). University of California Publications in Entomology Volume 57
Only three males of lutziana are known, all from Colorado. In having the flagellum of antennae dark ferruginous instead of black, lutziana differs from all our other species. It also differs from most other species in having the sixth sternite produced into a medio-apical lobe.
Male.—Black; small joints of tarsi ferruginous; flagellum of antennae dark ferruginous. Labrum, clypeus, and small supraclypeal mark clear yellow; clypeal mark almost touching margin of eyes and obtusely angled on each side. Tegulae amber, base infuscated. Wings sub-hyaline, tinged with brownish; nervures ferruginous, subcosta blackish. Pubescence pale ochreous or whitish, moderately long and dense on head and thorax. Tergite 1 with moderately long, erect whitish hair; following segments with short, erect hair, white on tergite 2 and black on tergites 3 to 6, a few long, pale hairs interspersed, and becoming appressed subapically to form narrow white bands, that on tergite 6 somewhat wider; apical margin of tergites 2 to 6 narrowly bare although with a few appressed black hairs at least on tergites 2 and 3; hair on each side of pygidial plate pale brown or blackish. Fringes of hair on ventral segments moderately long, white on sternite 1, becoming shorter on following segments and successively more brownish, but remaining long and white on each side.
Head somewhat broader than long; inner orbits of eyes distinctly but not strongly divergent above. Vertex moderately impressed on each side; lateral ocelli slightly closer to margin of eyes than their distance apart. Antennae slender, somewhat compressed and nodose, reaching middle of tergite 2, joint 3 on long side nearly one-third as long as 4. Proboscis moderately short; galeae of maxillae shining and nearly hairless. Clypeus shining, with fine, shallow, moder¬ately close punctures. Mesoscutum dullish, with dense, shallow punctures, but becoming more shining, with well-separated punctures on posterior middle of disk; scutellum moderately shining and densely punctured. Abdomen minutely and densely punctured, but with apical margin of tergites 1 to 6 narrowly smooth and punctureless. Sternite 6 with slight impression on each side toward base and with a medio-apical lobe which is broader than long, broadly rounded at apex, laterally incised to form subacute projection on each side, and with a median ridge, ending distally in a flat triangular space; base of sternite 6 with very fine, short, erect hair. Parameral lobes of genital armature slender, with usual dilation at base and with apex abruptly and strongly bent inward. Length 11 mm, anterior wing 8 mm, width of abdomen 4.5 mm.
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