100 COLEOPTERA OF NORTH AMERICA. 



Group I. — Hypocypti. 

 This group contains two genera, the species are very small, 

 broadly oval and pubescent. 



Middle coxje distant, inesosternum fiat or slightly concave. Hypocyptus. 

 Middle coxa? narrowly separated, mesosternum carinate. Microcyptus. 



Hypocyptus is represented on both sides of the continent, 

 Microcyptus (AnacyptusWJlovu) contains one species from Georgia 

 and Arizona. 



Gronp II. — Trichopsenii. 



Two very" anomalous genera form this group, both of which 

 occur in the Southern States, in the nests of Teniies. 



Body broad, narrowed behind ; pronotum narrowed in front, not impressed; 

 hairs long, but sparse and bristly. Trichopsenius. 



Body narrower ; pronotum not narrowed in front, with an apical impres- 

 sion, the bottom of which is membranous. Xenistusa. 



Group III. — Tachypori. 



The genera of this group are as follows: — 



Abdomen margined ; tibiae fimbriate at tip with unequal spinules. 2. 

 Abdomen not margined ; tibise fimbriate at tip with equal spinules. 7. 



2. Mesosternum not carinate. 3. 

 Mesosternum carinate ; maxillary palpi filiform. 4. 



3. Maxillary palpi filiform. Tachinus. 

 Maxillary palpi subulate. Tachyporus. 



4. Epipleurse horizontal ; elytra not prolonged. 5. 

 Epipleurse vertical ;, elytra longer than the body. (5. 



5. Mesosternum feebly carinate ; anterior tarsi % simple. Cilea. 

 Mesosternum strongly carinate ; anterior tarsi % dilated. 



Physetoporus. 



6. Mesosternum strongly carinate ; anterior tarsi "J, simple. Erchomiis. 

 Maxillary palpi subulate ; body finely pubescent. Conosoma. 



Cilea occurs in the Atlantic region, Physetoporus in Arizona, 

 each represented by one species. The other genera occur on 

 both sides of the continent, and the species are numerous. 



Group IV. — Bolitobii, 



Three genera constitute this group; the species are glabrous 

 and often prettily colored. The lateral suture on the under side 

 of the head is distinct. 



