22 Memoirs on the Coleoptera 



sharp hind thoracic angles and the usually very elongate and slender 

 antennae and legs. In fact the contrast in general appearance with 

 the more parallel and compact body and rounded basal angles of 

 Agonum is so great, that it becomes a matter of some surprise that 

 the validity of the two genera should be so persistently overlooked 

 or ignored. I know of no case which should cause any hesitation 

 in generic assignment as between Anchomenus and Agonum, which 

 is one of the best tests of generic validity. In the rather extensive 

 material at hand there are, however, a number of subgeneric groups 

 based upon various subordinate characters as follows : 



Hind wings wanting or vestigial, the sides of the elytra very gradually 

 rounding basally; body black,, without metallic coloration; dorsal 

 elytral punctures two to four in number 2 



Hind wings well developed, the humeri strongly rounded • • 3 



2 — Body rather narrow, elongate and moderately convex; antennae 

 moderately short, thicker than in typical Anchomenus; prothorax 

 with the sides distinctly and sharply reflexed, the basal foveae well 

 developed ; met-episterna short to moderately long. ... I (districtus) 



Body notably abbreviated; antenna short and very thick; thoracic 

 sides very finely margined, the basal fovese small and feeble; surface 

 flatter; met-episterna very short H (curtipennis) 



3 — Fourth anterior tarsal joint deeply and conspicuously lobed, on the 

 other tarsi less conspicuously bilobed or deeply emarginate, though 

 always having the outer lobe longer than the inner; metallic color- 

 ation rather more frequent than otherwise; antennae and legs long 

 and slender HI (guerrerensis) 



Fourth tarsal joint simply emarginate throughout; antennae and legs 

 long and slender 4 



4 — Body larger and stouter, never notably metallic; sides of the pro- 

 thorax more or less strongly reflexed; met-episterna short to rather 

 long; dorsal punctures three or four IV {sinuatus) 



Body smaller and more slender, frequently metallic or bicolored; sides 

 of the prothorax very finely margined; met-episterna long; dorsal 

 punctures three to six V (Junehris) 



The above species assigned to represent these groups only hold 

 good for the present work, and in a general revision other older and 

 better known forms might be chosen in some instances. Guerrerensis 

 is a species which appears to represent Chaudoir's ideas of Colpodes, 

 as also those of Mr. Bates, although both authors assigned many 

 species to the genus so identified which cannot remain there. The 

 species which forms the type of the subgenus Placodes, is here 

 described as new because I cannot identify it positively. This is 

 not very important or conclusive, however, as the true type of 



