80 COLEOPTERA OF NORTH AMERICA. 



Tribe III.— PIIVODYTIIVI. 



Anterior co.xoe transverse, feebly prominent, contiguous, with 

 large trochantin, the cavities strongly angulate externally and 

 narrowly open behind. Middle coxa3 oblique, not prominent, 

 moderately separated, the mesosternuni fiat, with an obtuse 

 carina which extends also to the metasternum. Posterior cox;t; 

 not prominent, separated by a distinct intercoxal process, oval at 

 tip. Abdomen vv^ith six segments, the sixth feebly visible, the 

 lirst moderately long. Antennte inserted under a frontal margin. 

 Kyos entirely absent. 



Pinodytes cryptophagoides, the only known member of this 

 tribe, is a small (2 mm.), oblong-oval insect, castaneous in color, 

 and glabrous. Originally described by Mannerheim (as Catops) 

 from Alaska, it has since been abundantly collected by Mr. Ulke, 

 near Washington, D. C, in the soil and rubbish under decaying 

 stumps. 



Tribe IV.— CHOLEVIIVI. 



Anterior coxte cylindric-conic, prominent, contiguous, without 

 trochantin, the coxal cavities feebly or not angulate externally 

 and closed behind. Middle and posterior coxsb variable in posi- 

 tion, either contiguous or not. Abdomen with six distinct seg- 

 ments, except in CoUjii where there are but five. Antennte free 

 at base ; no frontal margin 



This tribe contains in our fauna insects of small size and usually 

 ovate form; some live on carrion or in fungi, others in ants' nests. 

 The eighth joint of the antennae is smaller than the seventh, ex- 

 cept in Colon. 



The genera of this tribe may be divided into groups in the fol- 

 lowing manner: — 



Abdomen witli six segments. 



Posterior coxae distinctly separated, but in a variable degret; ; elytra 



usnally without sutural stria ; antenn.-c slender and long. 



Head broad, with narrow neck ; eyes distinct. Platycholei. 



Posterior cox.t contiguous ; sutural stria usually deeply impressed ; 



antennae mor(i or less clavate ; bead suddenly' narrowed behind tlie 



eyes forming a neck, occiput elevated in a ridge. Cholkv.*. 



Abdomen with five segments (often four in 9 )• 



Posterior coxae contiguous ; elytra with sutural stria well marked ; head 

 oval, not narrowed behind ; eyes round and moderately prominent ; 

 occiput not elevated. CoLO^KS. 



