744 THE AMERICAN NATURALIST. [Vor. XXXIX. 
dish brown. It must be similar to D. spheralcearum, but the 
antennz are differently colored. 
The following species are not considered valid : — 
D. tricincta Provancher, from California, is said by Fowler to 
be a synonym of enavata. This cannot be, from the descrip- 
tion; but it is not apparent that it differs from afficta. D. 
nerea Fowler, from California, is nigrifrons Cresson ; D. cinerea 
Fowler, from California, is &ztuberculata Cresson. Fowler can 
hardly be blamed for describing these as new, as when he pub- 
lished his paper Cresson's species were supposed to belong to 
Melissodes. D. ursina (Cresson) is enavata. D. apacha (Cres- 
son) is diminuta. The types of apacha have been in some 
liquid, presumably alcohol, and this accounts for part of their 
characters. I formerly separated the specimens of the Middle 
Sonoran zone as apacha, leaving those of the Upper Sonoran as 
diminuta; but the comparison of specimens from various locali- 
ties appears to show that the characters relied upon are too vari- 
able to serve for specific distinction. 
Two forms are new: — 
Diadasia afflicta (Cr.) subsp. perafflicta n. subsp. 
d.— Tegulz piceous ; second submarginal cell scarcely narrowed above ; 
bair of mesothorax and scutellum gray. 
9.— This sex does not materially differ from true a/ffzcta. 
Hab.— Clark Co., Kansas, 1962 ft, May (F. H. Snow, 1191); Hamilton 
Co., Kansas, 3350 ft. (F. H. Snow, 460); Wallace Co., Kansas, 3000 ft. 
(F. H. Snow, 852). Three females, from the same three localities, are 
numbered 851, 1197, and 445. 
Diadasia spheralcearum n. sp. 
d.— Length 7} mm.; like D. diminuta Cr., but with shorter, perfectly 
white pubescence, and a narrower, more parallel-sided abdomen; the 
pubescence of the abdomen, instead of being loose and suberect as in male 
diminuta, is appressed (except on first segment) and covers the surface ; 
aside from the pubescence, the hind margins of the segments are them- 
selves white; the apex is bidentate, the teeth being like those of diminuta, 
but rather larger; hind legs constructed as in diminuta ; shining hairless 
triangle of metathorax much smaller than in diminuta ; posterior part of 
mesothorax almost nude; tegula: subhyaline, ferruginous, dark at base; 
antennz entirely black. 
