356 G. R. CROTCH, M. A. 



ate punctate, interstices rather thickly but finely punctulate ; the external 



dark margin does not quite reach the humeral angle; underside black, legs, 



sides of sternum and abdomen red. L. *18 inch. 



Illinois, Ohio, Georgia, Washington. (Leconte, Horn.) 



This bears an embarrassing resemblance to Myc. sanguvndpennis 



from which the generic characters will, however readily separate it. 



b. — Elytra entirely black. 



C. erythroce^hala, (Lac.) Erot., 22fi; (Lee.) J. Phil. (2) i., 71; Pr. Phil. 



vii., 162, 15. — Very close to C. humeralis, from which it only differs by the red 



head, unicolorous elytra and rather more faintly punctate thorax. L. -14— 



•16 inch. 



Georgia, Missouri. (Leconte, Horn.) 



C. atriventris, (Lee.) J. Phil. (2) i., 71; Pr. Phil. vii.. 162, 14.-Again 

 very near C. humeralis, and not perceptibly differing except in color; the head, 

 thorax and legs are here of a clear red color, the rest black. L. - 16 iuch. 

 Georgia, Texas, Missouri. (Leconte, Horn, Ulke.) 



C. ailgulata, (Say) J. Phil. (1) v., 300; (Lee.) J. Phil. (2) i., 71 ; Pr. Phil, 

 vii., 162, 16; flavipes, (Lac.) Erot., 226. — Shortly ovate, black, head pitchy-red, 

 legs reddish-yellow, tibia? broadly triangularly dilated ; head and thorax rather 

 closely punctate, elytra striate-punctate, interstices finely and sparingly punc- 

 tate; underside finely punctulate. L. - 12 — -10 inch. 



Washington, New York, Pennsylvania. (Leconte, Horn, Ulke.) 



C. imieolor, (Say) J. Phil. (1) iv., 300: (Lee.) J. Phil. (2) i., 71; Pr. Phil. 



vii., 162, 18. — Entirely unicolorous black, not very shining; head closely punc- 

 tate, thorax very coarsely and deeply punctate, more closely so at the sides; 

 elytra punctate striate, interstices alutaceous, irupunctate; underside finely 

 punctate; tibiae broadly dilated. L. -16— -20 inch. 



Ohio, Tennessee, Washington, Maryland, Virginia, Louisiana, Illi- 

 nois, Pennsylvania. (Leconte, Horn, Ulke.) 



€. aflillis. (Lac.) Erot., 224; (Lee.) J. Phil. (2) i.,71; Pr. Phil, vii., 162, 14. 

 — Ovate, entirely clear red, elytra alone black; head and thorax rather spar- 

 ingly but clearly punctate; elytra deeply punctate striate, interstices sparsely 

 and finely punctulate; underside almost smooth. L. - 12 — -16 inch. 



Georgia to Texas. (Leconte, Ulke. ) 



This resembles a small Trilax in form and coloration, but could only 

 be compared with T. thoracica from which the fine interstitial punc- 

 tuation and smooth undersurface at once separate it. 



TRIPL.AX, Herbst., 1793. (Type russica.) 

 Aiitenute with the club 8--4-jointed, maxillary palpi with the last 

 joint broadly dilated, mentum triangular; eyes finely granulated, tho- 

 rax margined at the base; body coarsely punctate beneath. 



