152 Mr. G. C. Champion's Revision of the 



Coahuila, Villa Lerdo and San Isidro in Durango, Monterey 

 in Nnevo Leon (Hoge). 



The series of fifty specimens (varying from 7^-10| mm. 

 in length, exclusive of the head) sent by Hoge from 

 Northern Mexico connect the various forms of this species, 

 which is separable from C. limbicollis by the more shining 

 prothorax and base of the elytra ; the anteriorly narrowed, 

 less transverse prothorax (at least in (J), and the more 

 subulate elytra. The black patch on the prothorax varies 

 in extent, and is sometimes wanting; and the elongate 

 discoidal subapical streak on the elytra is often united to 

 the triangular scutellar mark (the suture remaining yellow), 

 the latter becoming gradually shorter and shorter (C. 

 lewisii) as the streak extends forwards till at last they are 

 united into a continuous stripe. Three males have been 

 dissected, including one from Kansas, and the aedeagus 

 proves to be formed very much as in C limbicollis and 

 C. pennsylvanicus. C. vittatus, Schaeffer, from Nogales, 

 Arizona, must be very closely related to the present species. 



21. Chauliognathus discus. 



Chauliognafhus discus, Lee, Proc. Acad. Phil, vi, p. 230 

 (1853) ; Trans. Am. Ent. Soc. ix, p. 44 (1881) ; Crotch, 

 Trans. Am. Ent. Soc. v, p. 78. 



? Chauliognathus misellus, Horn, Trans. Am. Ent. Soc. 

 xii, p. 150 (1885). 



Ochreous, the head between and behind the eyes, and sometimes 

 along the middle anteriorly, the antennae, two or three transversely 

 placed spots on the disc of the prothorax, often united into a common 

 fascia or dilated into an M -shaped mark, a small transverse patch 

 at the base of each elytron and a large spot on the disc at about 

 one-third from the apex, black ; the femora with the basal half or 

 more testaceous and the rest of the legs black ; beneath pale flavous, 

 the metasternum and ventral segments nigro-fasciate in $, the 

 aedeagal'cap shghtly infuscate in S- Head rather long, the eyes 

 somewhat prominent; antennae slender, fully as long as the body 

 and perceptibly thickened towards the apex in <$ (joints 3-8 slender 

 and 9-11 a little wider), shorter and filiform in $, joint 3 about half 

 the length of 4 in ^. Prothorax shining, broader than long, 

 roimded-subquadrate, the margins broadly reflexed, the disc with 

 an oblong sulciform impression in the middle. Elytra much wider 

 than the prothorax, gradually narrowing posteriorly, rather coarsely 

 punctate, and often obsoletely costate on the disc, shining at the base. 



