210 COLEOPTERA OF NORTH AMERICA. 



Light organs do not exist in any of the species, and the sexes 

 are very similar in form, differing, at most, by the length of the 

 antennae and the outline of the sides of the prothorax. Sexual 

 characters arc also seen in the last segments of the abdomen, 

 especially in Chauliognathus and MaltJiodes; in the latter genus 

 the claspers assume large size and great complexity. In a few- 

 instances tibial and tarsal characters distinguish the sexes, and 

 in m^,ny species of Telephorua the ungues are quite different. 



We have excluded the singular genus Omethes from this sub- 

 family. It is probably not a Lampyride, but where it may be 

 suitably placed we do not know. 



Two tribes may be recognized in our fauna: — 



Mentuni very long, wider in front. Chauliognathini. 



Mentum small, quadrate. Telephorini. 



Tribe I.— CHAliLIOGNATHIlVI. 



This tribe consists of but one genus represented in our fauna 

 by a moderate number of species. They are much more numer- 

 ous in tropical America, but so far as I am aware do not occur 

 in other countries. Chauliognathus differs from all others in our 

 fauna not only by the elongated head, and singular structure of 

 the maxillary lobe, which has a long extensile and contractile 

 fleshy filament, but also by the peculiar arrangement of the under 

 surface of the prothorax, and the sexual characters of the % . 



Tribe II.— TELEPHORIIVI. 



Excluding OnietJies, as above indicated, we have no improve- 

 ment to suggest to the table of groups already given. Classifica- 

 tion, 1st ed., p. 187 : — 



Elytra covering the wings ; gular sutures confluent ; prothorax trnncate 

 in front ; head entirely exposed. Podabri. 



Elytra covering the wings ; gular sutures separate ; prothorax rounded in 

 front ; head partly covered. Telephori. 



Elytra abbreviated, wings exposed ; gular sutures confluent. Malthini. 



Group I. — Podabri. 



Although the species of this group differ in the form of palpi, 

 as well as in the tarsal claws, they seem to indicate but one 

 natural genus. They are more numerous in the northern part 



of the continent, .and gradually fade out towards the tropics 



