liir. Iiiijuxi-iv jii i^ia .v.Mj uRrC STORE BEETLES. S8.J 



Tribe Aa. I'TILIXINI. 



This tribe is eompused of a single genus, separated from those 

 preceding mainly by the eharaeters given in the tribal key. The 

 head is deflexed, less retractile than in the preceding group ; an- 

 tennae ll-jointed. serrate in female and branched in male. 



XTX. Ptilinus Oeiiff. ITtii. (Gr., "feather.") 



Small cylindrical species, covered with short, fine appresseil 

 pubescence. The antenna' of male have the third joint elongate- 

 cylindrical, with a basal process as long as the joint itself, and 

 joints 4 to 10 strongly- flabellate or with long flat proces.se.s folding 

 like a fan; tarsi as long a^ the tibiai, mth the first joint as long 

 as the two or three following. T\v'o species have been taken in In- 

 diana, while another probably occurs. 



KEY TO I>'DI.\X.\ SPI.I lE.S OF PTILIXLS. 



H. Side margin of thumx tine but well deUned and even throughout; sub- 

 apical transverse i.-arina of last ventral segment distinct. 



lli.Si:. BUFICORN-IS. 



(«/. Side margin of thorax irregularly granulate-serrate and not well de- 

 fined ; subapical ventral carina nearly or entirely wanting. 

 &. Thorax equal to the elytra in width ; branch of fourth antennal joint 

 of male scarcely three times the length (.f joint; seutellum elongate, 

 ttnely and densely rugose. lobatds. 



hh. Thorax a little narrower than elytra ; branch of fourth joint nearly 

 fi^e times the length of joint ; scutellmu quadrate, coarsely rugose. 



ItiSo. PEUIXOSUS. 



lii.sil i5.j32). Ptium s BUFicoBxis Say. .Journ. Phil. Acad. Nat. Sci., Ill, 



182:;;. 180; ibid. II, lli.i. 

 ' Cylindi'ical, elytra not wider than thorax. Black or piceous, opaque, 

 usually paler in female; antenna? and legs reddish-yellow, thighs often 

 darker. Branch of fourth joint of male antenna; six or seven times the 

 length of joint. Thorax slightly wider than eljtra, widest before the base, 

 sides bri.adly curved, hind angles rounded, front ones rectangular, front 

 margin rather strongly rounded, narrowly reflexed at middle; surface finely 

 granulose at base, more coarsely in apical hall' ; median line feebly im- 

 pressed, terminating at base in a feeble, smooth protuberance. Elytra a 

 little more than twice as long as thorax and a little less than twice as long 

 as wide, finely scabrous and rather closely and distinctly punctured. Length 

 3-4.5 mm. 



Throughout the State; frequent. ^lay 11-Deeember 25. Oc- 

 curs on dead branches of oak and maple, into which the larvae bore. 



P lohatus Casey, dark pieeo-castaneous, antennae paler, length 

 S-ri mm., is recorded from Ohio. 



