158 LE CONTE.— LONGICOEN COLEOPTEEA 



Found near the Rocky Mountains; the disc of the thorax is scarcely elevated; 

 the spots of the elytra are placed as in the preceding, and are frequently obliterated: 

 the tarsi appear fuscous. 



PSENOCERUS. 



Antennae minime pilosas articulis a 4'° brevioribus. 

 Oculi emarginati. 



Tarsi articulo ultimo longiusculo, unguibus intcgris. 

 Palpi articulo ultimo tenui apico acute. 



A little insect which has been placed in the genus Clytus by Say and Haldeman, 

 and in Callidium by Olivier. With these genera it has nothing in common, and it 

 is difficult to understand how these authors have been led into error regardinof its 

 true affinities. 



The palpi are slender, and the anterior tibias have a distinct oblique impression 

 internally : the usual prominence of the external margin of the intermediate tibiae 

 is very slight. The femora are thicker than in the other genera of this group, and 

 somewhat clavate. 



1. P. PiNi, piceus, capite thoraceque confertissime punctatis, hoc non transverso, postice angustato et 

 constricto, elj'tris confertim grossius punctatis, ad basin utrinque tuberculo parvo notatis, fascia pone 

 medium alba, guttisque 2 vel3 utrinque cinereis, minus distinctis, scutello cinereo. Long- -23. 

 Callidium pini 01. 70, 8, 105. 

 Clytus supernotatiis Say. J. Ac. Nat. Sc. 3, 425 : Hald. 42. 



Found in every part of the Atlantic United States ; the base of the elytra is usually 

 paler than the other parts ; the small spots at the middle sometimes coalesce to form 

 a very narrow oblique band. 



STENOSOMA Muls. 



Ataxia Hald. 



Oculi emarginati. 



Antennae setaceae valde pilosse, articulis a 3 gradatim brevioribus. 



Femora modice clavata. 



Ungues integri. 



Tarsi postici articulo 1™° longiore. 



The body narrow, and almost linear, the thorax slightly rounded on the sides, 

 armed with an extremely minute spine : the elytra are obliquely truncate at the apex. 

 The general form is that of the narrow species of Elaphidion. 



1. S. SORDIDUM, nigro-piceum, sordide pubescens, pilisque erectis parcis undique vestitum, parce grosse 

 punctatum, punctis pone elytrorum medium subseriatis, elytris spatiis cinereis et nudis parvis variegatis, 

 antennis annulatis. Long. 47. 

 Ataxia sordida Hald. 56. 

 Stenidia Hald. Proc. Am. Phil. Soc. 4, 373. 



The last name is probably a clerical error for Stenosoma ; the antennae of the male 



