2io MEMOIRS ON THE COLEOPTERA 



The next three species, pugnax, subtropicus and occultator, also 

 constitute a well marked section. The type of occultator no longer 

 being in my collection, I have been compelled to cull the above 

 characterizations from the original lengthy genera-specific descrip- 

 tion (Cont. Descr. and Syst. Col. N. A., II, p. 69), the greater part 

 of the verbiage being .superfluous. I consider occultator to be dif- 

 ferent from pugnax, which was one of the forms included under 

 that name by Hayward. In pugnax the last ventral segment of 

 the male is smooth, with two apical setae; in the female the surface 

 of the last segment has fine sparse punctures throughout, each bear- 

 ing an infinitesimal erect hair, and the apex has four setae these 

 being the usual conditions in the subgenus. 



The type of esurialis seems to be a female, and I have associated 

 with it for the present, a second female, which agrees in almost all 

 characters, except that the body is notably less slender, with broader 

 head, larger pro thorax, slightly more convex eyes and shorter ely- 

 tra, these being but little more than one-half longer than wide; 

 but the peculiarly short antennae are similar in both examples, and, 

 in looking over a large series of vittiger, correspondingly striking 

 individual differences occur. The two examples associated above to 

 represent corax Lee., also differ perceptibly, for, besides the deep 

 black body and blacker femora of the Utah specimen, it has the head 

 evidently smaller and the elytra rather more elongate than the two 

 examples from Yuma; but, having no accurate knowledge of the 

 type, I am obliged to call them both corax. I have seen no indi- 

 cation of the elytral vitta noted by Hayward as visible in certain 

 individuals of corax. 



In' species having the basal thoracic angles obtuse and the sides 

 of the base oblique, the posterior seta on the upturned edge is often 

 at or very close to the angle, as in bradycellinus for instance, and 

 not far in advance of the angle as it is in litoralis and allied forms 

 having sharp right angles. 



Group III Icevus 

 Subgenus Microtachys nov. 



Although allied in some respects to the corax section of Isotachys, 

 especially in the obtuse basal angles of the prothorax and oblique 

 sides of the base, as well as in the position of the elytral foveae on, 



