LAMPYRIDAE. 211 



Group II. — Telephori. 



We find no reason for changing the table of genera previously 

 given by Dr. Le Conle,* except to suppress Rhagonycha, which 

 seems an unnecessary disintegration of Telcphorus; our genera 

 will then be as follows: — 



Last joint of maxillary palpi dilated, securiform. 2. 



Last joint of maxillary palpi suboval, obliquely truncate. 4. 



Hind angles of prothorax rounded. 3. 



Hind angles of prothorax {%) incised ; head short. Silis. 



3. Head moderately long, sides of prothorax not incised. Telephorus. 

 Head short and broad, sides of prothorax (^ ) nicked at the middle. 



Polemius. 



4. Sides of prothorax {%) incised at the middle and behind, antenu.-e 



{%) strongly serrate. Ditemnus. 



One species of the last-named genus has recently occurred in 

 California; with the exception of Polemius, they are therefore 

 represented on both sides of the continent. 



Group III. — Malthini. 



The species of this group are of small size and weak structure, 

 remarkable chiefly for the short elytra, which leaves the wings 

 partly exposed and folded along the dorsal surface of the abdo- 

 men. The group has been modified, as exposed in the Classifica- 

 tion Col. N. Am., by removing Tytthonijx which seems to have 

 no relation to the other genera and to rcscnible them superficially 

 merely by the abbreviated elytra. 



The wealth of variation in sexual characters is greater in this 

 group than in almost any other in Coleoptera. In I<-hfhyu7-us 

 it alTccts the middle legs of the % , and in Malthodei< the last 

 abdominal segments of both sexes, and the forms of the claspers 

 are quite as compUx as those represented by Baron R. Osten 

 Sacken in the Tipulidse with short palpi, Proc. Acad. Nat. Sri. 

 Pliila., 1859, pi. o and 4. The species are probaljly numerous, 

 but have not 3'('t received much attention from collectors. The 

 European species, which run somewhat parallel with ours, have 

 been excellently illustrated by the late Dr. II. von Kiesenwetter, 

 Linn. Ent. vii, pi. 2, 



* Classification, 189. 



