84 GEORGE H. HORN, M. D. 



leaving ouly a very narrow rufous margin. In viftafus the thoracic 

 spot is usually small, occasionally as large as in margliieUus and some- 

 times entirely wanting in which case the species appears to be more 

 naturally associated with the preceding group. In any genus, where 

 species are distinguished principally by colors, variations from a type 

 must be expected and when such occur must be left for the determina- 

 tion of each student, as short reviews like the present cannot at all 

 times be a guide. 



The former species is eastern, while the latter, occurs only in Cali- 

 fornia. 



Bibliography. 

 C. tricolor, Say. Journ. Aead. iii, 1S2; Erichs. Entora. 57. 

 C. punctatus, Lee. Proc. Acad. 1852, p. 164. 

 C. eximius, Er. Entomog. p. 57. 

 C. marginicollis, Lee. Proc. Acad. 1852, p. 164. 

 C. nigriceps, Say, Journ. Acad, iii, 183; Erichs. Entom. 56. 

 C. cribrosus, Lee. Proc. Acad. 1852, p. \%i;'^ cyanipennis Motsch. Bull. Mosc. 



1859, iv, p. 404. 

 C. bipunctatus. Say, Journ. Aead. iii, 185 ; Erichs. Eutom. 55. 

 C. validus, Horn, n. sp., supra. 

 C. quadrimaculatus, Fab. Ent. Syst. Suppl. 70; Erichs. Eutom. 58; ruftcoUls 



Fab. Ent. Syst. I, 2, p. 83 ; Syst. Eleut. II, p. 75. 

 C. histrio, Er. Entom. p. 59; Maun. Bull. Mosc. 1S43, ii, p, 247. 

 C. pulcbellus, Horn, n. sp., supra. 

 C. balteatus, Lee. Proc. Acad. 1852, p. 230. 

 C. insulatus, Lee. New Species, 1865, p. 94. 

 C. limbellus, Gemminger, Col. Heft VI, p. 121 ; limbatua \\ Lee. New Species, 



p. 94. 

 C. laticollis, Horn, n. s\)., supra. 

 C. confluens, Lee. Proc. Acad. 1852, 164. 

 C. punctulatus, Lee. Proc. Acad. 1852, 165. 

 C. vittatus, Say, Journ. Aead. iii, p. 184 ; Erichs. Entom. p. 60 ; Haworlhi 



Westvv. Trans. Ent. Soc. ii, i)8. pi. 10, fig. 9. 

 C marginellus, Lee. Proc. Acad. 1852, p. 164. 



TROPHIMTJS, n. gen. 

 Head elongate, eyes rather distant from prothoras, epistoma mem- 

 branous; antennee slender, third joint slightly longer than the .second and 

 equal to fourth; maxillary palpi with last joint attenuate, longer than 

 the second, third joint very short. Anterior tarsi of male four- 

 jointed, five-jointed in female. Segments of abdomen membranous at 

 middle; tarsi with first joint very slightly longer than the second. 

 The above characters will serve to distinguish the genus from any 

 in our fauna. It is allied to the European genera TrngJopa and Ho- 

 vi'xodlpnus in which the maxillary palpi are alike in both sexes ; but 

 difi"ering from either in having the last joint longer than the second 



