352 COLEOPTERA OF NORTH AMERICA. 



Group VII.— Crepidoderae. 



This group contains species of small size, and of wonderfully 

 active leaping power. The front coxal cavities are closed, and 

 the prothorax deeply impressed behind, usually with a basal plica 

 each side. 



The genera are as follows :— 



Elytra striato-punctate. 2. 



Elytra confusedly, uniformly punctured, posterior impression of prothorax 



deep, not limited by a basal plica ; epipleurse slightly foveate. 



Micraltica. 



2. Posterior impression of prothorax deep, limited by a basal plica. 3. 

 Posterior impression not limited by basal plica. 4. 



3. Antenna; slender. Crepidodera. 

 Antennae stout. Cerataltica. 



4. Upper surface strongly punctured, elytra irregularly striate. 



Orthaltica. 

 Upper surface finely densely punctured, elytra not striate. Systena. 

 Upper surface nearly smooth. Luperaltica. 



The genera Crepidodera, including Ejntrix, Systena, and 

 Orthaltica are represented on both sides of the continent ; the 

 others only in the Atlantic region. The last genus, by its sculp- 

 ture and form, has the appearance of pale colored Luperi, and is 

 further remarkable by the % having the 5th ventral segment pro- 

 longed behind into a process, differing in form in the two species. 

 Micraltica is established upon Haltica Burgeasi Crotch, and one 

 other species, CrepzcZofZera hana Crotch, from the Southern States. 

 Tliey resemble in miniature Haltica (Graptodera), but the pro- 

 thoracic impression is deeper, and the elytra much more coarsely 

 punctured. 



Group VIll. — Aphthonae. 



The species of this group are numerous and of small size. The 

 front coxal cavities are open behind; the prothorax is not im- 

 I)ressed; the hind legs are frequently longer than usual, the hind 

 tibiae feebly grooved on the outer side; the spur distinct; the 1st 

 joint of hind tarsi as long, at least, as the others united; the 

 claws simple. 



The genera of our fauna are the following: — 



Hind tarsi with 1st joint half as long as the tibise. 2. 



Hind tarsi with 1st joint one-tliird as long as the tibije or less; elytra 



uniformly punctured. 3. 



