OF THE l M I in STATES. 189 



San Diego, California. This species in characters closely resembles C. futilis: besides 

 tie differences in colour, it is a little more robust ; the carina of the p isterior angles of the 

 thorax is much more distinct, being one-third the length of the thorax, and is almost pa- 

 rallel with the margin. 



To this genus belongs Elater c h o r i s Say, (Trans. Am. Phil. Soc. 6, 172:) if i- appa- 

 rently allied to C. pulchellus, hut is larger, has the thorax covered with golden hair, and 

 the elytra yellow with black hands. 



E. nocturnus Esch. Thon. Vivh. 2, ::.'.: Mann. Bull. Mosc. 1- 1 1,239; I musculua 

 Esch. ib.: Mann, ih.; and C. littoral is Esch. ib.: Mann. Bull. Mosc. 1846; all from North- 

 \\ i stern America, are unknown to me. 



C. cinereipennis Esch, and ('. p u b e r u 1 u s Mum. I. c. 2 UK d<» not belong to this 

 genus, the tarsi being furnished with a lobe beneath. 



Elater dorsalis Say, and E. circumscripta Germ., refl rred by Germar (Zeitschr. 

 • >. 1 16) to In- second division of tins genus, diffeT by their narrowi r prost< mum, subacu- 

 minate mesosternum, and tarsi destitute of elongate Bets: the more convex and defli \< d 

 head gives them more resemblance to Elater, in general appearance, bul from the elon 

 basal joint of the antennae and other characters, I have placed them in M :repidius. 



( 1, DOS i E l in B /-"-. 



Frons plana Bemicircolaris, marginata, tenaiter < ilata: labium a tnndatam: mandibular 



prominui intennffl] rratse, articulo I icnti 



non brcvioro - [uilongiore; 11'"° acuto, non oo anm antice bn itum, 



mucrone pos? iotara inde conve mini 

 non protaberans: laminia subsubito parom dilatatis, vix dontatis: 



Cento Mini, mi": 1 I u-im brei I t". . r t i ar- 

 mati-. 



A curious little Bubcylindrical elongated insect, having b what the appearance of n 



slender Cardiophorus, or some of the lasl described Bpecies of Cryptohypnus, with the 

 thorax distinctly margined, and as much narrowed in front of the Bpin< s as at the apex; 

 the sides are considerably rounded, and the disc convex; the posterior angles are -mall, 

 acute, diverging and carinated; there arc no basal fissures: the mandjblea are more pro- 

 minent than usual, but are not long and alen l< r as in the Cebrionides. 



1. 0. femoral i 

 dine loo • . angnlia • 



: i et versus -utur.im parnn 

 flavis, his femoribue in '18. 



One specimen found in Missouri Territory, another from New ' n me bj Mr. 



Guex. The stria) of the elytra are very fine and impunctured; except al the base, and 

 arda the suture, thej can scarce!) be seen. The head ia punctulate like the thorax; 

 the margin is «r< rj slightly reflexed, and the irnpn wed frontal line ia not abbr< viated, al- 

 though not deep. 



