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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
In the key pagosana falls with zonata but is distinctly larger, with pubescence of head and thorax white, the abdominal bands broader, the band on tergite 2 leaving the basal corners black and the apical margin bare and impnnctate across the middle.
Female.—Black; small joints of tarsi dark ferruginous; tibial spurs testaceous; venter of abdomen strongly marked with ferruginous toward base. Tegulae mainly amber, but fuscous at base. Wings strongly dusky, nervures dark ferruginous, subcosta black. Pubescence of head and thorax white, moderately long and dense, but not completely concealing surface. Labrum densely hairy in middle and nearly bare on each side. Hair of tergite 1 moderately long and dense, and becoming short and appressed apically on each side. Abdomen with three white bands, moderately wide and dense, that on tergite 2 broadly receding from apical margin across middle and ex¬tending to base of normally exposed part of segment, but with a large wedge-shaped mark of black hair on each side of base, and thin enough across the middle to expose the minute punctura-tion, but without admixture of appressed black hairs either there or across apical margin of band. Band on tergite 3 covering apical depression and extending thinly onto disk on middle third of segment, and leaving apical margin narrowly bare and shining. Band on tergite 4 covering apical depression only and extending narrowly onto reflexed ventral part of tergite. Long hairs overhanging apical depression of tergites 2 to 4 numerous and moderately dark. Base of tergites 3 to 5 broadly black, with dense hair. Apical band on tergite 5 white on about outer fifth on each side, and dark brown across middle, like hair on each side of pygidial plate on tergite 6. Hair of venter ferruginous, except fringe on each side of sternites 2 to 4 white. Hair of legs white, with scopal hair of hind legs ochreous, hair of front tarsi and that on inner side of middle and hind basitarsi ferruginous, and especially bright and reddish on hind tarsi.
Head much broader than long, cheeks about as broad as eyes and inner orbits of eyes parallel. Vertex not impressed on each side, but ocellar region slightly elevated. Lateral ocelli about their diameter from occipital margin and their distance apart from nearest eye. Proboscis of ordinary length, galeae minutely tessellate, shining, and nearly hairless. Second submarginal cell receiving recurrent nervure less than one-fifth of its length from apex. Clypeus closely rugoso-punctate, the fine ridges between punctures more or less confluent and longitudinal, and more evident in median line. Frons dull, finely and densely punctured, and mesonotum opaque and obscurely punctured. Abdomen moderately shining; minutely and densely punctured; apical depression of tergite 1 bare and impunctate, and apical margin of tergite 2 moderately widely and of tergite 3 nar¬rowly bare and impunctate. Pygidial plate triangular, gently curved, about as long as wide at base, with apex narrowly ogival. Length about 13 mm, anterior wing 9 mm, width of abdomen, 4.6 mm.
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