North American Rhyncliophora, 267 



scales and erect squamiform hairs. Head rather depressed, but slightly- 

 wider than the beak; the latter very slightly longer than wide, distinctly 

 dilated at tip, arcuately and transversely impressed at base; surface 

 broadly impressed; upper margins of antennal scrobes rather elevated; 

 apex with a triangular denuded area which is limited by an angulate 

 ridge, the angle continued posteriorly for a very short distance by a 

 distinct carina; surface with sparsely placed erect scales, denser over 

 the eyes; the latter rather large, feebly convex; antennae rather long; 

 scape arcuate, extending distinctly beyond the anterior margin of the 

 prothorax, squamose, and with erect robust hairs; funicle coarsely- 

 setose, one-third longer, slender, first joint nearly one-half longer than 

 the second; club elongate-oval, finely pubescent. Prothorax one-half 

 wider than long; sides parallel, broadly arcuate; base and apex trans- 

 versely truncate; disk scarcely as long as the head and beak together, 

 cylindrically convex, rather finely and not densely punctate, each 

 puncture bearing a long erect pale scale. Elytra inflated, declivous at 

 apex; the latter slightly inflexed and acutely angulate; disk convex, 

 one-third longer than wide, in the middle twice as wide as the pro- 

 thorax, connate, suture entirely invisible and covered by the vestiture, 

 finely striate; striae rather deeply impressed, finely and not closely 

 punctate; intervals feebly convex, each with a single or partially double 

 row of long, erect, distant scales, which are cinereous and brown inter- 

 mixed. Legs rather short and robust. Abdomen with the first suture 

 broadly, feebly arcuate; second segment equal in length to the next 

 two together. Length 5.5 mm. 



California (Los Angeles 1). 



The antennal scrobes are lateral, deep, nearly straight, and 

 directed upon the eyes which they do not attain. It is the 

 largest species of the genus. 



THIN-OXEXUS Horn. 



T. nevadensis n. sp. — Form oblong-elongate, convex, clothed very 

 densely with small rounded scales, dark brown, feebly and unevenly 

 mottled paler and darker ; abdomen covered throughout with a dense 

 crust of similar scales, with intermixed elongate squamiform hairs. 

 Head and beak conical, flattened ; occiput convex ; beak with a short 

 median stria in the basal half, and a small triangular impressed glabrous 

 area at apex, the sides of which are in the form of acute ridges ; sur- 

 face densely covered with scales, with short erect scales intermingled ; 

 eyes very distant, on the sides, rounded, rather small, moderately con- 

 vex ; scrobes widely distant, more open laterally, narrow and deep near 

 the apex, broad and evanescent well before the eyes, the alee very wide 

 but not dilated ; antennae inserted nearly at the apices of the scrobes ; 

 scape densely scaly, feebly arcuate and extremely feebly contorted, at- 

 taining the prothorax ; first joint of funicle one-half longer than the 



