no FAiriLT II. CARABln.T-:. 



XXI\' PrEK(i>TiC'Hi s Mmi. l>lo. (( Jr.. "wing - compact." ) 



Black or greeni-^h-shinbig beetles of medium or large size, hav- 

 ing the characters of the tribe as above given. Forni elongate, more 

 or less ilepressed ; head but little eonstrii-ted behind the eyes: mar- 

 frin of eh-tra stmngh- interrupted pusterinrly. 



The members of this genus are among the most common of our 

 (arabidiv. They are found in woimU and along the borders of fields 

 under lugs, stones and leaver A number of the species hibernate 

 in the perfe^-t stase. Dr. Foi'lii^s disserted thirteen specimens of 

 this genus and found that 4 ! per cent, of the food was of inseots. 

 canker ^vorms. caterpillars, etc. The vegetable food was of fungi 

 and flowering plants. 



The principal papers dealing with the genus are a.s follows : 



L'Cnntr. — "Synopsis of the Species of Pt(:rn.<:fichus and Allied 

 Genera Inhabiting Temperate Xorth America."" in Journ. 

 Phil. Acad. Xat. Sci.. II. 1S52. 225. 



Li.Contf. — "The Pterosticlii of the Ignited States." in Proe. 

 Phil. Acad. Xat. Sei., 1878. 302. 



2:,r„„f,._" Synoptical Table," in Bidl. Brook. Ent. Soo.. Y. 



1SS2. L"). ct srq. 



Wickliam.— In Journ. X. Y. Ent. Soe.. IIL lS9.i. ISl. 



About 12-") species are kno■^\^l from the United States. Of these 

 24 have been taken in Indiana, while 5 others may oeeur. For con- 

 venience the Indiana species are first arranged in four groups, and 

 these are then treated in order. 



KEY TO GROrP.S OF 1.\DI.\X.4^ PTERdSTK HI S. 

 II. llnl>;ll pUUOnilOs llOUe ill- iiUf .iIll.V. (il'OUll A. 



<iff. I>ri-s,il pmietiu'es two or iiKive. 



/<. I.;isT joint of i>alpi cyliiuU-ieal, tniucate at tip: size larger, usuall.v 



10 or more miii. 



i: Siile jiieces of nietathora.x slmrt. their leu-;tli distiuctl.v less tliaii 



tnice tlieir widtli at h.-i^e. (ironp /{. 



rr. Side pieces of nietatliorax lonir. narrowed from base to apex, tlieir 



lei!L.'tii lieiiia: uuire tliau twice the width at base. Groui) C. 



hh. Last .ioiiit of palpi elmi-aie-oval. sianel.v truiii are: size smaller, not 



<.ver s..-, miu. Oroup D. 



To tills group belong small or medium sized species either wholly 

 without dorsal punctures or with one puncture behind the middle 

 on the third interval, elose to the se-ond stria. They have the thorax 

 usually rounded or trapezoidal, much narrowed behind, the margin 

 naiTow. not reflexed. the base without a marginal line. Six sitecies 



