342 COLEOPTERA OF NORTH AMERICA. 



lated, claws usually simple, in some of the smallest species appea- 

 diculate. 



Small insects found on leaves of trees, usually of prettily varie- 

 gated colors, spotted or striped, and very rarely pubescent. 



Three groups are indicated, but as the genera are but few in 

 our fauna, it is scarcely necessary to enlarge upon them : — 



Claws simple. 2. 



Claws appendiculate. Monachi. 5. 



2. Prothorax not margined at base, crenulate. Ckyptocephali. 3. 

 Prothorax margined at base, not crenulate. Pachybrachi. 4. 



3. Front edge of prothoracic flanks sinuous or toothed subg. Bassareus. 

 Front edge of prothoracic flanks straight. Cryptocephalus. 



4. Prosternum flat in front, depressed behind. Griburius. 

 Prosternum feebly channelled. Pachybrachys. 



5. Prosternum longer than wide. 6. 

 Prosternum wider than long. Monachus. 



6. Antennal joints 6-11 wider. Diachus. 

 Antennal joints 7—11 wider. Triachus. 



One of the species of Diachus, chlorizans, seems allied to the 

 genus Prasonotus Suffr., while Triachus basalts, perhaps, repre- 

 sents the South African genus Achsenops Suffr. 



Tribe VII.^EIJMOLPIIVI. 



Body oblong, convex, rarely rounded or oval, usually metallic, 

 sometimes testaceous or spotted. Head moderate, deflexed, front 

 wide, eyes more or less emarginate; antennas filiform, or slightly 

 thicker externally, usually long; widely separated at the base. 

 Prothorax generally with distinct lateral margin, wliioh is, how- 

 ever, rarely effaced. Pygidiura covered by the elytra, which are 

 rounded at tip. Front coxse separated by the prosternum, glo- 

 bose, cavities closed behind. Legs moderate, the front ones 

 sometimes elongated; tarsi broad, 3d joint deeply bilobed, claws 

 appendiculate or bifid in our genera. 



The groups into which this tribe divides itself are quite numer- 

 ous, and form a very involved complex. But few of the genera 

 are represented in our fauna, so that in the subjoined table the 

 definitions given to the genus will frequently .apply to the entire 

 group. 



For such a limited fauna as is here treated, the table given 

 by Crotch (Proc. Acad. Nat. Sci., 1873, p. 33) is more available 

 than the material obtained by a condensation of the arrangement 



