THE GEOUND BEETLES. 113 



XXVIII. DiPLOCHiLA Brulle. 1835. (Gr., "double + lip.") 



Smooth black beetles of small or medium size. Elytra usually 

 with one dorsal puncture near the middle of the third interval, the 

 apex feebly sinuate. They live beneath stones and rubbish, usually 

 m damp places. Three species and two varieties are known from 

 the United States, all of which occur in Indiana. The following 

 table is based on that of Dr. Horn in Bull. Brooklyn Entomological 

 Society, III, 1880, p. 52 : 



KEY TO SPECIES OF DIPLOCHILA. 



'/. lllnd tingles of thorax tlistinct. 



h. Seveuth stria of el.vti-a feeble or almost obsolete; base of thorax 

 broader than apex, 

 c. Smaller, 13-15 mm. 176. laticollis. 



re. Larger, IS or more miu. 170a. var. ma.ior. 



f»&. .Seventh stria about as distinct as sixth; thorax less narrowed in 

 front, base nujro narrowed, scarcely broader tlian a]iex. 

 il. Elytral intervals all black. 177. impkessicoltjs. 



(/(/. -Alternate elytral intervals reddish-purple. 



177a. var. altekn.Sins. 



ua. Hind angles of tlioi-ax (ibtusely rounded: elytr.il strire finer, seventh 



almost obsolete ; length 11-12 mm. 178. obtdsa. 



*17C (710). DiPLOCHiLA laticollis Lee. Ann. Lye. Nat. Hist., IV, 1848. 

 319. 

 Black, feebly shining; antenme and tarsi dark brown, the basal joints 

 of both iJiceous. Thorax one-half wider than long; sides curved to behind 

 middle, thence oblique to base ; hind angles rectangular. Elytra finely 

 alutaceous, the strife shallow, not or very faintly punctured ; intervals flat. 

 Ivength 13-15 mm. 



Throughout the State ; frequent. February 6-October 9. Some- 

 times attracted by electric lights. 



176a (710a). Diplochila laticollis major Lee, loc. cit., :ns. 



In addition to its larger size, this form lias the basal impressions oi" 

 thorax broader and more shallow, the elytral strise finely but distinctly 

 punctate, the seventh fainter, often wholly obsolete. Length 18-20 mm. 



Throughout the State ; common. :March 18-Oetnber 27. Usually 

 considered a variety of la/icoUis, but probably distinct. 



177 (711). DiPLOCHiLA IMPBBSSICOLLIS L>ej., Spec. V. ISHO, 682. 



Black. .\pex of thorax less narrowed than in Inticullifi. nearly as 

 broad as l)ase. Elytral stria' deeper, rather coarsely punctured; interv.-ils 

 iM(jre convex. Lenf,'th 16-17 mm. 



Lake, Lanorte and Vigo counties; seai'ce. Marcli 18--July 7. 



