158 H. C. PALL. 



A. male specimen collected near Cincinnati by Mr. Dury is closely 

 allied to the black female above mentioned, but the prothorax is 

 somewhat smaller and shorter relatively to the elytra, the color dark 

 brown, the autennse pale. It is quite likely distinct, but I am un- 

 willing to describe it without seeing both sexes. 



XER4NOBIHM new genus. 



Elongate, subcylindrical insects, of large size for the group, 

 densely clothed with ashy-gray recumbent hair. The terminal 

 joint of both maxillary and labial palpi is elongate fusiform, not 

 wider than the penultimate, the latter nearly as wide as long in the 

 maxillary, but slender and as long as the terminal joint in the 

 labial palpi. Antennae rather short, less than half the length of 

 the body, the three outer joints elongate, the stem distinctly serrate 

 or pectinate. Prothorax nearly equal in width to the elytra, the 

 hind angles rounded and undefined, side margin acute posteriorly, 

 completely obliterated in front. Elytra confusedly punctate or 

 finely scabrous. Front and middle coxse contiguous, the prosternum 

 long before the coxse; ventral segments 1, 2 and 5 subequal ; 3 and 

 4 a little shorter, the fourth slightly shorter than the third. Tarsi 

 slender, the third and fourth joints not emarginate, fifth joint elon- 

 gate, linear, claws with a small but evident subbasal angulation. 



The four species included in this genus inhabit the dryer regions 

 of the southwestern parts of our country. None of them are as yet 

 surely known in both sexes, and therefore the antennal structure 

 cannot be completely defined. 



First joint of hind tarsi fully one-third longer than the second, fourth joint twice 



as long as wide ; form more slender. 

 Sides of prothorax parallel as viewed from above ; head ( % ) a little wider than 



the prothorax, antennal stem strongly ramose 1. laliceps. 



Sides of prothorax rather strongly rounded, widest near the middle, head ( J) 



subequal in width to the prothorax 2. macr n in. 



First joint of hind tarsi only slightly longer than the second, fourth joint but 



little longer than wide; form more robust; head (£) very distinctly 



narrower than the prothorax. 



Elytra vaguely quadricostate ; size larger • • • -3. eiliereuiil. 



Elytra not at all costate ; size smaller 4. desertum. 



1. X. laticeps n. sp. — Cylindrical, feebly depressed, brown ; body through- 

 out and legs clothed with dense, short, closely appressed cinereous hair. Head 

 large, the eyes very large and more prominent than the sides of the prothorax ; 

 front finely scabrous, with scattered punctures, and one and one-half times as wide 



