52 GEO. H. HORN, M. D. 



3Ifile. — First joint of antennae stout, second small, third longer than the fol- 

 lowiuo;, triangular, the apical angle very slightly prolonged, joints four to ten 

 with a branch of clavate form arising from the base of each, eleventh joint mod- 

 erately elongate, clavate. 



Female. — First joint stout, second small, third elongate, triangular, nearly as 

 long as the next two, joints four to ten broader than long, serrate within, joint 

 eleven elongate oval, ^obtuse at tip and not as long as the preceding two. 



This species closely resembles the preceding, but is more elongate, 

 the elytra! striae less deep, and the intervals less densely punctured. 

 The structure of the antennj^ will readily distinguish the two species. 



Of this species I have seen but two specimens, the male collected 

 by Dr. Schaum near Sacramento, now in the cabinet of Dr. LeConte, 

 a female collected by myself at Fort Tejon, California. 



PEROTHOPIN.E. 



Head moderately convex, front slightly narrowed by the insertion of the an- 

 tennse under distinct supra-antennal ridges; labrum short, transverse, connate 

 with the front, the suture almost entirely obliterated, the clypeus very short, as 

 in Elateridae ; mandibles acute, arcuate, fimbriate on the outer side; prosteruum 

 slightly lobed in fnmt, the mucro short ; hind coxse. laminate, claws pectinate. 



The difficulties which authors have realized in dealing with Pero- 

 thops have already been alluded to. I can only repeat what I have 

 elsewhere pulilished that the genera Eucnemis, Elater, Cebrio, Pero- 

 thops and Cerophytum do not represent such different types of struc- 

 ture as to require them to be made separate families. They are 

 indeed very closely related, and the discussion which has prevailed is 

 indicative of that fact. That they differ sufficiently to be separated 

 in groups of less than a family value is evident, but they should 

 be associated as modifications of one type, and for that aggregation 

 I prefer the name Elateridae. 



In Perothops the structure of the front of the head is 2)ractically 

 the same as in Cebrio. In both the clypeus is quite short as in 

 Elateridae, and to its front margin is fixed the labrum, short and 

 transverse, immovable in both. The suture is very distinct in Cebrio, 

 but almost obliterated in Perothops, W'here it is only visible in imma- 

 ture specimens, or those softened with solution of caustic potassa. 



In the Eucnemides, however, the clypeus is of different form and 

 the suture between it and the front is a short distance below the nar- 

 rowest part between the antennae, while the labrum is at most very 

 small and retracted, practically invisible Avith very rare exception. 



