Goieopterological Notices, VII. 351 



having a very minute circular emargination at the middle, which 

 is evidently a remnant of the deep fissure observable in the nar. 

 row produced intercoxal process in Scydmsenini. The middle 

 coxae are contiguous, with the acetabula apparently confluent and 

 bordered along their entire posterior edge with short dense pale 

 and scale-like pubescence. The abdomen is normal and the dor- 

 sal pygidium not exposed. Legs generally well developed, slen- 

 der, with the femora noticeably clavate and the hind tarsi slender, 

 the four basal joints decreasing more or less rapidly in length. 



The four species represented before me may be separated as 

 follows : — 



Body uniformly testaceous or ferruginous in color. 



Larger, the transverse impression of the pronotum narrowly but completely 

 interrupted at the middle. 

 Prothorax feebly constricted at the sides near the base; male antennae 

 without an excavated arc, the fifth joint short but much wider than the 



others 1 Mformis 



Prothorax parallel and not constricted near the base, the male antennae 

 with a deep and regular arcuate excavation internally involving joints 



four to six 2 arcifer 



Smaller and more slender, the transverse impression more broadly but 



feebly and incompletely interrupted at the middle 3 gracilis 



Body black, the elytra rufo-testaceous; transverse impression of the pronotum 

 not at all interrupted 4 itiyops 



In geographical range the genus Lophioderus is confined, as far 

 as known, to the Pacific coast line, from the vicinity of Monterey 

 probably to the Aleutian Peninsula. It will prove to be rather 

 abundant in species, 



1. L,. MformiS Makl.— Bull. Mosc, 1852, p. 330 (Scydmaenus.) 

 Elongate-oval, somewhat stout, polished, impunctate,dark rufo- 

 testaceous, the legs and antennae slightly paler and more brownish ; 

 pubescence sparse, pale and coarse, longer, denser and bristling on 

 the neck, short and erect at the sides of the prothorax, rather short, 

 even and strongly recurved on the elytra. Head with the neck dis- 

 tinctly longer than wide, the e^^es at the middle of the sides, mod- 

 erate in size but very convex and prominent; antennal prominences 

 large but feeble, the front broadly impressed and feebly declivous 

 between them, the clj^^eus long, with a conical, strongly de- 

 clivous surface and broadly rounded apex ; labrum short and 

 transverse; mandibles small ; neck long, broadly constricted, the 

 sides from the eyes to the prothorax feebly convergent and 



