1030 FAMILY LII. CEKAMBYC1D.E. 



16 having been taken in the State. They are distinguished by the 

 finely granulated eyes, acutely triangular seutellum, and by having 

 the front coxal cavities open behind. 



KEY TO INDIANA GENERA OF TRACHYDERINI. 



</. Thorax opaque, its sides with a spine or large tubercle; size larger, 13- 



25 mni. 



b. Body pubescent. XXIII. TRAGIDION. 



II). Body not pubescent. XXIV. PURPURICENUS. 



/HI. Tlmrax shining, sides unarmed: si/e much smaller, not over 8 mm. 



XXV. BATYLE. 



XXIII. TRAGIDION Serv. 1S34. (Gr., "a young goat.") 



Large or medium-sized species having the seutellum small, 

 broadly triangular; thorax densely punctured, both it and elytra 

 with black pubescence concealing the punctures; antenna? filiform, 

 joints 5-11 rHrinate on outer side. 



1905 (C.11'7). Ti!A(;ii)ioN OHjri Linn.. S.vsl. Xal.. Ed. X. :'.!>:',. 



Elongate. robust, subcylindrical. Black: elytra each \vith a large, 

 rounded orange spo< near base: an ten use wholly black. Thorax as wide as 

 long, sides rounded, armed with a small spine behind middle. Elytra each 

 with three raised lines on disk. Length 1(5-25 mm. 



One specimen in each of the Webster and Field Museum collec- 

 tions labelled "Ind." Occurs in the "Atlantic and Southern States." 



XXIV. PURPURICENUS Serv. 1833. (L, "purple.") 



Medium-sized, handsome black and scarlet or black and yellow 

 species, having the thorax with a small spine each side, the seutel- 

 lum broadly triangular and acute at tip. and the elytra not pubes- 

 cent, Two of the three species occur in Indiana. 



1906 (6129). PURPURICENUS HUMERALIS Fab., Ent. Syst., Supp., 1798, 143. 

 Elongate, robust, subcylindrical. Black, opaque, the legs alone feebly 



shining; elytra each with a large, triangular, scarlet humeral spot, defined 

 by an oblique line, running from seutellum to middle of outer margin. An- 

 tenna? of male two-thirds longer than body ; of female about the length of 

 body. Thorax coarsely, densely and roughly punctured. Elytra deeply and 

 rather coarsely punctured on basal half, more finely and densely toward the 

 apex. Length 14-18 mm. 



Taken only in Lake County in Ilic wasli-np along the beach of 

 Lake Michigan where, at times, it is frequent. June 15-July 13. 

 Said to occur elsewhere on oak and hickory. 



