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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
Without the male the relationship of monozona to other species is uncertain, but in my key to the famale it falls next to truttae. Whatever its final status may be, monozona will be recognized by having the hair of the abdomen black beyond the first segment except for a narrow white band on the second tergite.
Female.—Black; small joints of tarsi slightly reddened; claws ferruginous; tibial spurs pale testaceous. Clypeus sometimes with a small yellow spot on anterior middle of disk. Tegulae amber, wings moderately dusky, nervures piceous, subcosta black. Pubescence rather short, erect, and moderately dense, not concealing surface, pale ochreous on notum of thorax and paler be¬neath and on face. Hair of tergite 1 whitish, with small patch of black hair on each side of the disk. Hair of abdomen otherwise mostly black, becoming more or less dark seal brown on tergite 7 and on venter, with fringes on sternites 3 to 5 sometimes a little whitish on each side; on tergite 2 a narrow white band, receding moderately from margin across middle and sometimes abruptly widened on middle half. Hair of legs pale ochreous, but ferruginous on inner side of tarsi, and becoming pale brown on outer side of front and middle basitarsi, middle tibiae, and at apex of hind femora.
Head much broader than long; inner orbits of eyes parallel. Vertex only slightly impressed on each side; lateral ocelli about their distance apart from nearest eye and their diameter from occipital margin. Proboscis moderately long; galeae rather shining and hairless. Second sub-marginal cell somewhat longer than wide and receiving recurrent nervure one-fifth of its length from apex. Clypeus rather finely and densely rugoso-punctate. Frons and vertex finely and densely punctured. Mesonotum dull, with small, dense, shallow punctures becoming slightly more sepa¬rated on posterior middle of scutum. Abdomen minutely and densely punctured; apical depression of tergite 1 bare and impunctate except far to each side; depression of tergite 2 similar, but punctured and thinly hairy on its basal half across the middle; apical margin of tergite 3 nar¬rowly bare and impunctate. Pygidial plate about as long as wide at base, with apex narrowly rounded. Length 13-15 mm, anterior wing 9-10.2 mm, width of abdomen 4.8-5.5 mm.
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