THE (iUOliKI) BEETLES. 89 



a wcll-iiiarkfd iiilcnial f-ild; disk usually with dorsal punctures. 

 Front til)i;r hroadci- at tip. deeply eiiiari^iuale within, the innci* spui' 

 situated at the summit of the noteh ; hind coxa3 eontiguous. Front 

 tarsi of males rathei- broadly dilate*] and covered beneath with small 

 scales. 



The tribe is represented in the Tnited States by five genera, all 

 of which occur in Indiana. 



KEY TO GENERA OE I'TEKOSTICII 1 NI. 



(/. TtM-miiial joint of palui dilated; elytra without dorsal i)iiiR-tures. 



XXIII. Myas. 

 (/(/. 'reniiiual .);iint ul' palpi eyliiidricnl or slightly oval. 

 b. Front tarsi of male nonnally dil.-ited. 



c. I>ast .ioiut of palpi as long as or longer than the next to the last, 

 the hitler with two set;e (hristly iiairs) in front. 



XXIV. Pterosticih s. 

 cc. Last .joint ot luilpi slKaier lii;m the next to last, the lattiT ^vith 

 a number of setie in front. 

 il. Elytra with one dorsal puneture; size larger. 14 or more nun. 



XXV. EVAHTIIIUS. 



(hi. Elytra without dorsal i)unctures; si/.e smaller, not over 12 mm. 



XXVI. Amaka. 



hi). Front tarsi ot male oblicpiely dilated; form oblong, subdepressed ; 



black, very shining, usually with iridescent reflections; dorsal 



punctures (uie. XXVII. Loxandrts. 



XXIII. i\lYAS Dej., 1828. 



Beetles of medium size and hroad forin, having the head and 

 thorax black and elytra purplish. Two species occur in the United 

 States. Of these but one has as yet been taken in Indiana, though 

 Dury has taken the other at Cincinnati, Ohio. They may be sepa- 

 rated as follows: 



KEY TO species OF MYAS. 



(/. Tliorax depressed at sides; elytra! strire punctured; length IS-UO mm. 



120. COBACINIS. 



iKt. Thorax not depressed at sides; elytral stri;e not or very obsoletely 

 punctured; length KJ-15 mm. cyanescens. 



120 (404). Myas coracinus Say. Trans. Amer. Phil. Soc, II, 1.S23, nil; 

 ibid. II, 482. 

 Black, elytra i)tu'plish. Th()rax liroad. transversely (piadrate. Iriini 

 angles rounded, hind angles rectangular, margin purplish. Elytra brnnd 

 with acute strite which are finely punctured. Length 18-20 nun. 



Throughout the State but scarce; taken in nine widely separated 

 counties. Occurs beneath logs and chunks in open woods with a 

 loose soil. May 21-October 7. 



