NORTH AMERICAN COLEOPTERA. 21 



This genus is intermediate between Cenophengus and Tytthonyx, but 

 differs from both by the third joint of the antennae having a process. 

 The gular sutures are confluent behind the mouth, and the triangular 

 space is deeply concave, as in other Phengodini. 



S. bicolor. — Black, prothorax and under surface bright reddish yellow; 

 mouth and sides of head behind the eyes testaceous. Head densely punctulate, 

 prothorax alutaceous, margined at sides and less strongly at base of apex; disc 

 channeled. Elytra not densely but coarsely punctured, with a strong discoidal 

 costa and a shorter one nearer the suture. Length 7.5 mm. 



Several males vpere collected in Arizona by Mr. Morrison. 



TK:L.EPH0RUS DeGeer. 



T. costipeiinis. — Black, prothorax yellow, with a broad dorsal vitta, which 

 is angularly dilated just behind the middle. Elytra very coarsely punctured with 

 a well-marked discoidal costa and a shorter one nearer the suture ; mouth some- 

 times tinged with testaceous. Length 6 mm. 



Florida, Messrs. Hubbard and Schwarz. Quite similar to T. lineola, 

 and differs only by the more coarsely sculptured and costate elytra. 



POLEMIl !S Leo 



P. princeps. — Black, head smooth, front whitish yellow. Prothorax smooth, 

 shining, broader than long, nearly truncate at base, sides broadly reflexed, rounded 

 into the apex with the front angles obliterated, hind angles rectangular; pale red, 

 with a black dorsal vitta not quite attaining base or apex, deeply nicked at the 

 sides about one-third from the hind angles. Elytra finely scabrous and pubescent, 

 margined with testaceous along the sides. Length 14 mm. 



Arizona, one male. 



P. strenuus. — Similar to the preceding, but the black dorsal vitta 

 is strongly dilated in front of the base, and the elytra are not margined 

 with yellow. Length 9 mm. 



One female, Arizona, Mr. Morrison. The prothorax is twice as wide 

 as long and rounded on the sides into the apex ; they are more narrowly 

 reflexed than in P. princeps, and as is the case in all females, not nicked. 

 The elytra are somewhat dilated behind the humeri in both, and the usual 

 three faint costse are quite apparent. 



P. iiiarginicollis. — Black, head smooth, mouth whitish. Prothorax trape- 

 zoidal hind angles rectangular, front ones rounded, sides nearly straight, apex 

 broadly rounded ; smooth, pale yellow, with a broad dorsal vitta attaining the tip 

 and to the narrow basal margin, broader in front of the base, sides reflexed, edged 

 with black. Elytra scabrous-punctured, slightly dilated behind the humeri, with 

 the costse very feeble. Length 7 mm. 



One female, New Mexico ; Mr. Ulke. These three species have the 

 antennae feebly serrate. 



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