THE Gnorxn beetles. 67 



Trilic IV. BEJXBIDIIXl. 



Beetles of small size, black, reddish-brown- or bronzed in hue, 

 having the antenna slender, arising' from beneath a slight frontal 

 margin, the first or the first two joints glabrotis ; mandibles feebly 

 curved, acute at tip ; last .joint of palpi awl-shaped, the next to last 

 club-shaped and with two set;e. Thorax with a bristle-bearing 

 puncture at the side and another at hind angle; prostemum not 

 prolonged. Elytra with sides narrowly inflexed, margin inter- 

 rupted behind the middle, the disk with dorsal punctures ; surface 

 in our genera glabroi^s. 



The tribe is represented in the United States by four genera, 

 three of which occur in Indiana. 



KEY TO INDIANA GENEBA OF BEMBI0IINI. 



<i. Front tibi89 not obliquely truncate at apex; sutural strise of elytra not 



recurved at apex ; scutellar strife present. 



7). Eyes large or moderate. XVII. Bembidium. 



T)l). E.ves entirely wanting. XVIII. Aniijajs. 



(1(1. Front tibife obliquely truncate at apex; sutural strise recurved at apex; 



scutellar strise absent. XIX. Tachys. 



XVII. Bembidium Latr. 1832. (Gr., "a buzzing insect -I- little.") 



A large genus of small black, greenish, or bronzed beetles, hav- 

 ing the characters of the tribe as above given. Elytra glabrous, 

 striate; front tibia deeply emarginate, apical angle not obliquely 

 truncate ; hind coxa' touching. ]\Iales with the first two joints of 

 front tarsi dilated, the first joint being slightly elongate and nearly 

 quadrate, the second more or less triangTilar. with the inner angle 

 usually slightly prolonged. 



The Bembidids occur for the most part along the banks of 

 streams, ponds and lakes, especially on mud tlats and bars. A few 

 are found in moss and amongst old leaves about the trunks of 

 trees and stumps or beneatli the baric of logs. Several, perhaps 

 most, of the species hibernate as imagoes. 



The principal papers treating of the genus are as follows: 

 Lrcoiilc. — "Catalogue of the Species of Bembidium found in 



Lhe United States" m Proc. Phil, Acad. Nat. Sci., 1857, 2. 

 llaild-dvd, Roland. — "On the Species of Bembidium of America 

 North of .^lexieo" in Trans. Amer. Ent. Soc. XXIV, 1897. 

 32-143. 

 J-Jayirarcl. Iloland. — "Synonymical Notes on Bembidium and 

 Descriptions of New Sjjecies" in Trans. Amer. Ent. Soc, 

 .VXVII, 1901, 156-158. 



