Studies of North American Bees 15 



tubercles, spot on tegulae in front, two linear spots on mesoscutellum, 

 lines on first four femora beneath and an apical spot on posterior femora, 

 broad stripes on the tibiae covering most of the outer face and nearly 

 interrupted subbasally on anterior tibiae, outer side of basitarsi, spots on 

 extreme sides of first abdominal tergite, broadly medially interrupted 

 bands on tergites 2-5 which are deeply emarginate on anterior margin and 

 all but cut through on 2 and 3, and lateral cuneate spots on 6, bright yel- 

 low. Apical tarsal joints reddish. Pygidium rounded, with short lateral 

 spines. Clypeus coarsely punctured, its apical margin raised and bearing 

 on each side two strong teeth, the margin between the teeth with a double 

 curve. Antennae wholly black. Vertex and mesoscutum finely rough- 

 ened by very close small punctures, the enclosure on pygidium opaque, 

 densely and shallowly punctured on a broad basal area. Face with long 

 pale hair, dense in two tufts above antennae, that on vertex strongly 

 ochreous, that on mesoscutum thin and rather short, gray faintly tinged 

 with ochreous. Ventral scopa white. Hair of tarsi within bright reddish 

 or golden. Wings as in <^ or perhaps slightly clearer. 



Type. — Sowbelly canyon, Sioux county, Nebraska, June 23, 

 191 1, on Trifolium repcns (R. W. Dawson), J*. 



Allotype. — Newcastle, V^yoming, June (M. Gary), $. 



Paratypes. — Type lot, 2 ^. 



This is a member of the ernarginatwn group. The male differs 

 at once from A. emarginatum Cresson, A. titusi Ckll., A. teniii- 

 florae Ckll., etc., in the broad yellow stripes on the apical half of 

 the tibiae. The Wyoming female seems to agree with what would 

 be expected by analogy in the other sex of the Nebraska males, 

 so that little hesitancy is felt in so considering it ; only, one would 

 rather expect the two sexes to agree in color of the tubercles, and, 

 in fact, the males usually do have a small pale spot or band on the 

 tubercles, though sometimes they are entirely black. 



Anthidium emarginatum (Say). 



1824. Megachile emargmata Say, Long's Second Exped., 11, p. 352, ?. 

 1864. Anthidium emarginatum Cresson, Proc. Ent. Soc. Phil., II, pp. 



374-375, ? c?. 

 1868. Anthidium atrifrons Cresson, Trans. Am. Ent. Soc, I, p. 387, ?. 

 1907. Anthidium emarginatum Cockerell, Univ. of Colorado Studies, 



IV, pp. 249-250, ? c?. 



Common in Sioux county, in Warbonnet and Monroe canyons, 

 June 13 to August 6, at flowers of Pcntstemon glaher and an 



15 



