424 COLEOPTERA OF NORTH AMERICA. 



Oral organs perfect ; 



Middle coxae contiguous. Rhipiphorini. 



Middle coxse widely separated. Myoditini. 



Oral organs atrophied. Rhipidiini. 



Tribe I.— EVAIVIOCERIIVI. 



Oral organs perfect; eyes rather finely granulated, oval, feebly 

 emarginate in Pelecotoma, widely divided in Toposcopus; antenuaj 

 11-jointed, inserted at the sides of the front, flabellate from tlie 

 fourth joint % , or serrate 9 ; lateral margin of thorax obliterated, 

 the base lobed at middle, serrate each side, the scutellum visible; 

 elytra entire, covering the abdomen; middle coxse narrowly sepa- 

 rated ; metasternal side pieces narrow; abdomen with five ventral 

 segments ; tarsal claws serrate or dentate in our genera. 



Two genera occur in our fauna : — 



Eyes oval, feebly emarginate. Pelecotoma. 



Eyes divided, the two portions widely separated. Toposcopus. 



Pelecotoma Jiavipes Mels. occurs in the Atlantic region; the 

 claws are feebly bidentate. Toposcopus Wrighlii Lee. is found 

 in New Mexico ; the claws are serrate. 



Tribe II.— RHIPIPHORIIVI. 



Oral organs perfect ; eyes entire, very finely granulated ; an- 

 tennae inserted between the eyes upon the front, biflabellate in 

 the males, serrate in the females; scutellum covered by a lobe of 

 the base of the prothorax ; lateral suture of prothorax entirely 

 wanting; elytra not much shorter than the abdomen, pointed be- 

 hind, not meeting closely along the suture; middle coxse sligiitly 

 separated; epiraera of metathorax large, episterna wide; ventral 

 segments five; tarsi long; claws bifid at tip. 



Cuneiform insects with coarsely punctured and sparsely pubes- 

 cent surface, of varied colors, found upon flowers. 



Our species all belong to Rhipiphorus, for which the name 

 Emmenadia has been substituted in the Munich catalogue. 



Species occur in the Atlantic and Pacific regions. 



Tribe III.— MYODITIIVI. 



Oral organs perfect; labrum not visible; eyes not emarginate, 

 very finely granulated ; antenna inserted on the front, inside uf 



