170 COLEOPTEllA OF NORTH AMERICA. 



The following table will enable the genera to be recognized: — 



Mandibles jDi-ominent, acutely margined above, fectangularly fiexed at tip, 

 head not retracted ; thorax acutely margined ; 

 Tarsi simple, slender. Stenocolus. 



Tarsi lobed beneath ; 



Anterior coxse separated by the j^rosternum, and but very little more 



prominent than it. Dascyllus. 



Anterior coxje prominent and contiguous. Anorus. 



Mandibles not prominent, arcuate at tip, not acutely margined above, head 



strongly dellexed ; tarsi slender ; 



Claws pectinate ; thorax acutely margined. Odontonyx. 



Claws simple ; thorax not acutely margined ; 



Anteniiffi slender, middh; coxie not more widely separated than the 

 anterior, thorax obtusely margined, prosternum moderately long 

 before the coxae. Anchy tarsus. 



Antennffi serrate (pectinate % ), moderately long, middle coxa3 twice 

 as widely sej^arated as the anterior, margin of thorax very obtusely 

 rounded, prosternum short in front of the coxae. Anchycteis. 



Antennae serrate, very little longer than head and thorax, middle 

 coxae and thorax as in Anchycteis, prosternum short, vertical in front 

 of the coxae. Araeopus. 



Of the above genera Stenocolus alone has an onychium. The 

 anterior coxse are moderately separated in the first two alone, 

 the tip of the prosternum being also more prolonged. The first 

 four genera have the thorax acutely margined; in the others the 

 margin is cither obtuse or very rounded. In Anchytarsua and 

 Anchycteis the last joint of the ma.xillary palpi is triangular, in 

 Arseopus moderately elongate, flattened and truncate. 



Tribe III.— BRACHYPSECTRI]\I. 



Front narrowed by the insertion of the antennfe and dilated 

 beyond, clypeal suture not distinct; labrum small; mandibles 

 short, not prominent. Antenna? serrate from the fifth joint. 

 Anterior coxae angulate externally, with distinct trochantin, sepa- 

 rated by the prosternum which meets the divided mesosternum ; 

 middle coxse oval; posterior coxte narrow, with narrow plates. 

 Tarsi slender, ungues simple. 



This tribe is represented by Brachypsectra with one species 

 fulva Lee, of yellowish testaceous color, finely pubescent, re- 

 sembling a miniature Dascyllus, but of more depressed form. It 

 occurs in Texas. • 



