ClCINDELID^ AND CARABID/E 75 



basally. Length (9) 14.5 mm.; width 7.6 mm. New Mexico 



(Coolidge), Wickham diffractus n. sp. 



Body stout, black and shining; head rather small, sparsely punctured; 

 prothorax broad, moderately convex, smooth, the median stria 

 distinct, the sides coarsely punctured and wrinkled, rather broadly 

 reflexed, the angles rather broadly rounded; elytra broadly oval, 

 smooth and shining, having approximate striae of very fine punctures; 

 margins rather broad throughout, except at base, where they become 

 narrower, rather densely, muricately punctured and usually of a 

 greenish-bronze color; under surface almost entirely smooth and 

 impunctured, the edge with three or four distinct serrations basally; 

 male as broad as the female of discors. Length 14-17 mm. South- 

 ern Sierras of California latipennis Horn 



Latipennis seems to combine some general structural features of 

 the luxatus and discors groups of the genus, the elytral sculpture 

 being as in the arcuatus section of the discors group, but it differs 

 from both in the serrate elytral side margins toward base, this being 

 another special character, besides cancellated elytral sculpture, 

 well known in Calosoma and reappearing in Callisthenes. The elytral 

 sculpture of diffractus is remarkably different from any other known 

 at present in the genus, because of the absence of longitudinal striae 

 and great prominence of the short transverse lines; the anterior 

 serratures of the side margins are strong in this species. 



Pasimachus Bon. 



It is very long since this purely North American genus has been 

 given any attention, even in the way of isolated descriptions and 

 meanwhile the discoveries made by various collectors, chiefly in the 

 Gulf regions and Sonoran provinces, have become rather numerous, 

 so that a revision of all the known forms in a systematic way has 

 become desirable from many points of view. I have endeavored 

 to do this, so far as possible with the material in my collection, in 

 the following tabular statement. Some of the characters used by 

 LeConte in a very superficial sketch (Bull. Buf. Soc. Nat. Hist., 

 1874, p. 266) forming the last word on our species, do not seem to 

 be of much decisive value, such for instance as the form of the 

 spine of the middle tibias and the degree of basal thoracic constric- 

 tion, and I have therefore merely made occasional use of the latter 

 only. I am unable to identify substriatus, of Haldeman, described 

 in very few words (Proc. Ac. Nat. Sci., Phila., I, p. 313) as black, 



