JAMES CHESTER BRADLEY 
275 
extended along the top of the lateral faces, which bear also a few small pimctures 
above but none below; posterior face sharply declivous, with a few hairs 
arising from small punctures. 
^^'ing venation as shown in figure 10. 
Inner surface of the anterior metatarsus with a few erect but not stout 
spines; middle tibia with a group of stout spines on the apical part of its 
outer surface, two or three near the apex on the ijosterior margin being es- 
pecially stout; posterior tibia with a few stout sjiines on its i)Osterior border 
and on the apical part of its outer surface. 
Abdomen sessile, the basal segment short, Iwoad and rather thick, enlarging 
directly from the base, without anterior neck, sej)arated by a shallow de- 
pression from the second ventral; the latter with convex horizontal surface 
onlj' and no transverse carina; sides of the first segment coarsely and closelj' 
punctate, its dorsal surface and the rest of the abdomen polished, very sparseh' 
and finely punctate; p3^gidium shallowly emarginate, its sides sharply mar- 
gined, bearing a median, longitudinal, slightly raised, iinpunctate fold, the 
depressed areas between this and the margins with a few punctures. 
Sagitta much reduced, slightly chitinized, each forming a thin-edged, rolled 
plate, somewhat as in crassa; volsella a small compressed disc; ramus 
broad, its apical margin broadty emarginate, the ijostero-dorsal angle forming 
a prominent bluntl>' pointed process, the inner surface with a sparse brush of 
setae; squama broad, its posterior margin not notched; uncus as seen from 
the side strongty falcate from be^'ond a prominent angle near the base, as 
seen from above, flattened, its apex obtuselj' truncate, not at all emarginate 
(figures 31, 32, and 33). 
Type . — Hot Springs, Arizona, July 2, 1902, (E. J. Oslar), [Cornell 
University, No. 123.1]. 
Tliis species finds its nearest relatives in crassa, castanea and 
stygia. The shape of the uncus is absolutely distinctive, as far 
as I have observed. 
Brachycistis (Brachycistis) castanea (Cresson), cf. 
I860. casauica Cre.sson, Proc. Ent. Soc. Phila., 4: .388, cf'. 
Genitalia: Sagitta ver>' short and blunt, each bearing externallj' toward its 
apex a pitted chitinous bulb, and overlapped by the ends of the short volsella, 
which is still smaller than the sagitta; ramus large, thick, its posterior margin 
deepU concave, its inner surface with an inconspicuous setiferous area; 
squama short and thick, its posterior margin deei)ly notched, its upper angle 
produced into an acute lobe; uncus straight, thick and blunt, greath- widened 
before and abruptly taj)ered to the apex (figures 27 and 30). 
The description and figures of the genitalia are drawn from a 
balsam mount made from a homotypo from Durango, Colorado. 
Some of the specimens found standing in the collection of the 
American Entomological Society" under this name, and so re- 
corded by Fox, belong to other species. 
TR.VXS. AM. ENT. SOC., XLIII. 
