354 COLEOPTERA OF NORTH AMERICA. 



The occurrence of the latter genus in FloricLa is remarkable, 

 as it is otherwise known only from Siberia. 



Gioiip XI. — Chaetocnemae. 



These are small bronzed species with the elytra more or less 

 distinctly striate, the pro thorax not impressed ; the front coxal 

 cavities entirely closed; the 1st and 2d ventral segments are 

 closely connate; the hind thighs very thick, the middle and hind 

 tibia)' toothed on the outer margin, about one-third from the ex- 

 tremity ; the hind tibias with a small acute spur ; the hind tarsi 

 not elongated, 1st joint as long as the others united ; the claws 

 appendiculate. The antennge are rather widely separated. 



Two genera occur in our fauna : — 

 Size moderately large (5.5 mm.); protliorax witli a faint transverse basal 



impression ; elytra with dense coarse punctures arranged almost in 



rows; claws simple (habitus of Colaspis). Euplectroscelis. 



Size small ; prothorax without impressions ; elytra with regular distant 



strise of punctures, the inner ones sometimes irregular near the scutel ; 



claws appendiculate. Chaetocnema. 



These genera resemble each other in no important respect ex- 

 cept in the form of the hind tibiae. We have great doubt as to 

 the propriety of associating them in the same group. 



Group XII. — Dibolice. 



A single genus, Dibolia, is known of this group, and is repre- 

 sented in our fauna by but one species, which extends from the 

 Atlantic to the Pacific. It is easily recognized by the antennae 

 being very approximate; the head strongly deflexed ; front coxal 

 cavities open behind; hind thighs very large; hind tibiae broader 

 than usual, with the terminal spur large and emarginate ; hind 

 tarsi inserted at the end of the tibia?, not elongated ; claws small, 

 appendiculate. The elytra are feebly but regularly punctato- 

 striate. 



Megistops, ascribed by Boheman to California, and placed by 

 Chapuis in this gtoup, does not belong to our fauna, but to that 

 of the Pacific Islands. 



Group Xlll. — Psylliodes. 

 This group also consists of but a single genus, Psylliodes, 

 represented in our fauna by two or three small closely allied 

 species, on both sides of the continent. 



