114 



FAMILY IT. CAKABIDiE. 



177a ( ). Diplochila impressicollis alternates Casey. 



Differs from typical impressicollis only as shown in table. Size the 

 same. 



Vigo and Lake counties; rare. May 30-June 7. 



17S (712). Diplochila obtusa Lee. Ann. Lyc. Nat. Hist., IY. 1848, 320. 



Black, feebly shining ; antennae reddish-brown ; tibise and tarsi piceous. 

 Thorax nearly one-half wider than long, base wider than apex, sides feebly 

 curved, basal impressions deep. Elytral striae not punctured ; intervals 

 feebly convex, the third without dorsal puncture. Length 11-12 mm. 



Rare ; two specimens from Vigo County. April 11. 



XXIX. DiciELus Bon. 1813. (Gr., "two + pitted.") 



Black, violet or bronzed-purple beetles of large size, possessing 

 the characters of the tribe Licinini as above given. From allied 

 genera they are separated by the absence of dorsal punctures and 

 by having three joints of the antennae smooth. In our species the 

 elytra are deeply striate, with the seventh interval carinate from 

 the humerus to a varying distance, and with the eighth and ninth 

 striae well separated. The generic .name refers to the impressions 

 near base of thorax. Their food has been shown by Dr. Forbes to 

 be wholly of insect origin, thus proving their beneficial habits. The}' 

 occur beneath logs and stones, usually in high, dry. open woods. 

 Seventeen species are known from the United States. Of these 

 nine have been taken in Indiana, while another perhaps occurs. 

 For literature see : 



Horn.— "Synoptic Table," in Bull. Brook. Ent. Soc, III, 

 1880, 51. 



Wickham. — "Coleoptera of Northeastern America," in Journ. 

 N. Y. Entom. Soc. IV. 1896. 44. 



KEY TO INDIANA SPECIES OF BIC^LUS. 



(/. Elytral intervals very irregular, interrupted by large punctures. 



179. SCULPTILIS. 



da. Elytral intervals regular, not interrupted. 



b. Thorax distinctly narrower at apex than base. 

 c. Elytra not uniform black ; length 1S-25 mm. 



(1. Elytra violaceous or purplish. 180. purpuratus. 



drl. Elytra brilliant brassy or cupreous. splendtdus. 

 cc. Elytra black. 



e. Intervals of elytra alternately broader and more convex; hu- 

 meral carina very long. 181. furvus. 

 ee. Intervals of elytra equal. 



/. Two bristle-bearing punctures on margin of thorax near mid- 

 dle : form moderately elongate, the elytral intervals equal. 



182. ELONGATES. 



