106 COLEOPTEKA OP NORTH AMERICA. 



Grroup I. — Piesti. 



These insects are very depressed, slender, and not narrowed 

 behind; our species are few and of small size. The genera may 

 be thus distinguished : — 



Front eoxse contiguous. 2- 



Front coxse separated ; abdomen not margined. Lispinus. 



2. Abdomen margined ; tarsi 5-jointed. '-i- 

 Abdomen not margined ; tarsi 3-jointed. Gly.ptoma. 



3. Front tibiae not spinose. -1. 

 Front tibiae spinose. ■•■ 



4. Abdomen widely margined. Triga. 

 Abdomen very finely margined. Eleusis. 



5. Front impressed, in % horned; body very depressed. Siagonium. 

 Front not impressed ; body slightly convex. Hypotelus. 



Lispinus and Eleusis occnr on both sides of the continent; 

 Glyptoma in the Atlantic region and in Arizona; the other two 

 genera in the Atlantic region only. 



Group II. — Trigonuri. 



Coarsely punctured, rather depressed insects, with long, parallel, 

 usually substriate elytra; abdomen narrowed behind the elytra. 

 Five species occur in the Pacific region under pine bark. 



Sub-Family II.—MICROPEPLINAE. 



This sub-family consists of two genera containing small sub- 

 quadrate species ; in one the thorax, elytra, and abdomen are or- 

 namented with acutely elevated ribs; the antennae are inserted 

 under the sides of the front, 9-jointed, and terminate in a small 

 club received into cavities on the under surface of the prothorax; 

 the prosternura is entirely corneous. The anterior coxae are 

 transverse, not prominent, the hind ones distant, rounded; the 

 tarsi are 3-jointed. The second ventral segment is broadly di- 

 lated at the middle, and separates the hind coxse. 



Body with elevated ridges. Micropeplus. 



Body polished, without ridges. Kalissus. 



This sub-family thus completes the approach of the Staphyli- 

 nidse towards the Clavicorn series in Ilisteridaj. 



