356 Gqleopterological Notices, VII. 



part of the Pacific coast fauna ; the Opresini are probably'" repre- 

 sented in those regions by Scydmsenus omthorax Bndl. 



LOPHIODERINT. 



The ver^'^ elongate neck, with peculiar dorsal sculpture, indi- 

 cates a marked isolation of Lophioderus from any other type of 

 Scydmgenidse, and in fact renders it as aberrant among the tribes 

 with subulate fourth palpal joint, or Scydraaenidse subulipalpi, as 

 Chevrolatia is among those having that joint rigidly fused to the 

 third ; it should therefore constitute a distinct tribal group. 



I.OPHIODERIJS n. gen. 



The head in this genus is porrect and greatly exserted, borne 

 upon a long, moderately constricted neck, which is carinate and 

 biexcavate upon its dorsal surface, the eyes median in position, 

 and the antennae widely separated and strongly modified in struc- 

 ture in the male. The maxillary palpi are of the usual type pre- 

 vailing in the large tribes Euconnini and Scydrasenini, the fourth 

 joint being distinct, subulate, finely acuminate and inserted ob- 

 liquely in the hollowed apex of the third joint. The mandibles 

 are unusually small, and appear to be hidden when closed under 

 the large declivous and conical clypeus. The prothorax is more 

 elongate than usual in this family, carinate at the sides pos- 

 teriorly and impressed transversely near the base, but without 

 submedian foveas, the prosternum deeply emarginate and quite 

 short before the coxse, with an oval pubescent foveiform excava- 

 tion before each.* The scutellum is present between the bases of 

 the elytra, but is extremely small and somewhat elongate in form. 

 The elytra are entire, conjointly rounded at apex and are of the 

 usual structure and pronounced convexity prevailing in the Eucon- 

 nini. 



The metasternal side-pieces are entirely covered by the elytra, 

 the hind coxae very wide, extending to the sides of the body and 

 completelj' contiguous, the posterior edge of the metasternum 



* The fact that this abbreviation of the prosternum before the coxsb is as evi- 

 dent in the present type, vrith elongated prothorax, as is the large develop- 

 ment of this part in forms like Eutheia, vpitli short and broad i)rothorax, shows 

 that the relative development of the prosternum before the coxae is a really im- 

 portant tribal character, and is not due directly to the mere greater or less 

 elongation of the prothorax. 



