AMERICAN COLEOPTERA. 355 



M. dissimulator, sp. n. — Subovate, red, elytra, sternum and two tho- 

 racic spots (one on the anterior, one on the posterior margin) black ; thorax 

 rather closely and clearly punctate, base margined, faintly sinuate, with a few 

 deeper punctures; scutellum black with a few scattered punctures; elytra 

 faintly punctate striate, interstices distinctly punctate especially on the disc ; 

 sides of metasternum sparingly and coarsely punctate, ventral segments punc- 

 tate. L. '18 inch. 



Illinois. (Ulke.) 



CYRTOTRIPLAX. Crotch. 



Tritoma, % Fab. nee. Geoff. (Type humeralis.) 



Differs from Triplax by its short ovate form, the antennae always 



with an abrupt 3-jointed club, the maxillary palpi less broadly dilated. 



the thorax not margined at the base, the body hardly punctate 



beneath. 



Tritoma brunnca (Lac. Erot., p. 222, 3) is an immature G. angu- 

 Jata ; Trit. livida (Lac. Erot., p. 227, 12) is probably C. affirm, and 

 is also evidently immature. 



a. — Elytra more or less red. 

 €. humeralis, (Fab.) Syst. El. ii.,p. 571; tceniata, (Lee.) J. Phil. (2) i., 71 : 

 Pr. Phil, vii., 162, 12; tceniata, (Lee). — Shortly ovate, black, antennae, legs, a 

 subquadrate humeral spot, and the apex of the fifth ventral segment reddish- 

 yellow; head and thorax clearly and pretty closely punctured; scutellum 

 large, smooth, or with a few very 6ne punctures at the base; elytra finely stri- 

 ate-punctate, interstices with a few scarcely visible punctures; underside with 

 the meta-epipleurae deeply punctate. L. '10 — *16 inch. 



Var. ruficeps, (Lee.) J. Phil. (2) i., 71; Pr. Phil, vii., 162, 11. 

 This differs only by having the head of a clear red color. 

 Var. vittata, (Lee.) J. Phil. (2) i., 71; Pr. Phil, vii., 162, 10. 

 The humeral spot is prolonged to the apex, leaving only the suture 

 black. 



Var. aulica, (Horn) Trans. Ent. Soc, 1871, p. 343. 



Pennsylvania, Ohio, Illinois, Iowa, Missouri. (Leconte, Horn, 

 Ulke.) 



The head, thorax and apical ventral segment are entirely reddish- 

 yellow. 



C. biguttata, (Say) J. Phil. (1) iv., 89; (Lee.) J. Phil. (2) i., 71 ; bamle, 

 (Lac.) Erot., 22y. — Very closely allied to C. humeralis, but less broadly oval, 

 entirely pale beneath, elytra more deeply striate, and the interstices slightly 

 more visibly punetulate, especially at the base. L. "12— '18 inch. 

 Pennsylvania, Georgia. (Leconte, HorD, Ulke.) 



C mimetica, sp. n. — Rather broadly ovate, head, thorax and club of an- 

 tennae black, elytra red with the external margin black; head and thorax 

 clearly and uniformly punctate, scutellum red, punetulate; elytra finely stri- 



