290 CASEY 



former essay on the present group (Ann. N. Y. Acad. Sci., V, 

 P- 330)- The species are extremely numerous, closely allied 

 and local, forming a very difficult study. Doubtless many more 

 than a hundred of them exist in the arid regions extending from 

 western Texas to southern California, this region, expanding 

 but little to the north or south, being the sole and comparatively 

 restricted habitat of the genus. The forms enumerated below 

 seem to be specific, but further study may prove some of them 

 to be more properly subspecies. They are differentiated prin- 

 cipally by the form of the body and development of the hind 

 wings, after the manner of Blapstinits inhabiting the same envi- 

 ronments, by sculpture, size and form of the prothorax, and, in 

 some cases, by certain evident differences in the scutellum. 

 Those in my cabinet may be defined as follows : — 



Anterior tibim strongly and acutely everted externally at apex, as usual 

 in the first division of the tribe ; elytral punctures feebly setigerous, 

 the setaj erect; antennae long; surface generally shining, at least 

 in part; wings fully developed to vestigial 2 



Anterior tibiae swollen and rounded externally at apex but not angu- 

 larly produced ; elytral punctures nude; antennas shorter; hind 

 wings apparently obsolete; integuments dull. [Subgen. Meto- 

 poiiiopsis n. subg.] 39 



2 — Metasternum long, on a line through the coxee, between the meso- 



coxae and ante-metacoxal groove, very much longer than the first 

 ventral segment 3 



Metasternum shorter, only slightly longer than the first segment, the 

 wings somewhat less developed than in the preceding group. ...33 



Metasternum still shorter, as nearly as discernible equal in length to 

 the first segment; body more oval as a rule, the wings much 

 abbreviated or vestigial 30 



3 — Prothorax equal or subequal in width to the elytra 4 



Prothorax very evidently narrower than the elytra in both sexes 20 



4 — Prothorax subparallel, widest at about the middle 5 



Prothorax widest evidently behind the middle, more notably narrowed 



anteriorly 17 



5 — Body more or less stout in form 6 



Body elongate and notably slender 16 



6 — Prothorax alwa3's very obviously less than twice as wide as long.. 7 

 Prothorax shorter and strongly transverse, twice as wide as long or 



very nearly 15 



7 — Species of larger size S 



Species of moderate size 10 



