OF AMERICA NORTH OF MEXICO. 9 



1. S. soLiTARiuM. — Atrum, supra glahrum, subtus parce cinereo-pubescens, thorace latitudine fere tluplo 

 breviore parce punctato, ante basin callo liovi, alteroque utrinque versus latera modicc elevatis, basi 

 sinuato, elytris subtilisime strigosis, parce subtiliter punctatis, pedibus cyanescentibus. Long. rl3. 

 Ceramhyx solitarius, Say. J. A. N. S., 3, 410. 

 Callichroma solitarium, Hd. 1. c. 32. 



A single specimen was found in New Mexico by Dr. Wislizeniis and presented to 

 me. Say's specimen was found on the Arkansas near the mountains. 



Group 4. 



This group forms the passage from those with gibbous sterna to the succeeding 

 groups. The body is elongate, sometimes subdepressed, resembling Elaphidion, 

 sometimes Purpuricenus, but from both of these sections the present is distinguished 

 by the bifid mandibles. The antennae (as far as known to me) have twelve joints in 

 both sexes, in Deltaspis the last joint is indistinct, the palpi are short and but little 

 dilated, the maxillary but little longer than the labial; the femora are not clavate : 

 the posterior tarsi scarcely elongated, the joints of the abdomen are nearly equal. 



TYLOSIS. 



RIandibulaj non elongatac. 

 Thorax rotunde depressiusculus, dorso callosus. 

 Mesosternum subplanum antice non subito declive. 

 Elytra apice rotundato, truncata non armata. 

 Corpus nitidiusculum, parce brevissime pubescens. 



Differs from a Mexican genus which I consider a Ceragenia, in having the thorax 

 unarmed and the elytra not armed with a spine towards the tip ; the mesosternum is 

 not at all gibbous. The 12th joint of the antennae is very distinct, and m the I these 

 organs are much longer than the body. 



1. T. MACULATus. — Niger, thorace elytrisque coccineis, illo latitudine fere duplo breviore, punctato, callis, 

 5 laevibus nigris modice elevatis, elytris confertim punctatis, macula humeral! alterisque utrinque tribus 

 nigris. Long. -75. 



New Mexico, Dr. Wislizenus ; the spots on the elytra are placed near the suture, 

 the second is a little before the middle, and is somewhat transverse, the third elliptical 

 near the tip; the humeral spot is sometimes obsolete.* 



* A small Mi'sican species of this gouus, vrlilch seems nondescript, may be thus cliaracterized : 



T. ocur.ATus — Niger, thorace elytrisque coccineis, illo latitudine vix breviore, ante Lasin angusto constricto, 

 confertim punctato, callo utrinque ante medium hcvi nigro: elytris confertim punctitis immaculatis, soitelio 

 nigro. Long. -45. 



I'ucnto Xacional. ^Ir. Pease. 



