174 WILLIAM G. DIETZ, M.D. 



from the preceding species aside from coloration, by the stouter an- 

 tennae and tarsi, the short fourth joint of the latter and the small 

 connate claws. 



S. wickltami n. sp. — Narrowly oblong, black, legs rufous, coxse, knees and 

 tarsi blackish, densely clothed with large, broadly oval imbricate scales, grayish 

 white, underside a shade darker. Beak less robust, curved, as long as head and 

 prothorax, scaly in its basal half, shining and more finely punctured beyond- 

 Antennse moderate, inserted two fifths from the apex, second joint of funicle 

 nearly twice the length of the third joint, outer joints not niucli wider. Head 

 wide, subopaque, thinly squamose. Prothorax distinctly wider than long, nar- 

 rowed anteriorly, rounded on the sides, broadly and distinctly constricted at the 

 apex. Elytra about one-fourth wider at the base than the prothorax, nearly 

 twice as long as wide, humeri prominent, sides straight, subparallel for one-half 

 their length, then gradually rounded to the apex, strise entirely concealed by 

 the very dense, scaly vestiture, interstitial setiB snberect, white, squamiform and 

 very conspicuous. Thighs strongly clavate, tibiae moderate, subparallel, terminal 

 hooks small; tarsi slender, third joint broadly bilobed, fourth projecting much 

 more than the length of the preceding joint; claws small, connate fully one- 

 half their length. Length 2.0 mm. ; 0.08 inch. 



Hab. — Arizona (Riverside), Wickham. 



A small specimen in my collection. Readily distinguished from 

 either of the preceding species by the broader prothorax, the elytra 

 but little wider than the former, the conspicuous elytral setfe and its 

 smaller size. 



PROMECOTARSUS Casey. 



Beak curved, moderately robust, separated from the head by a 

 fine transverse groove ; basal tufts obsolete ; scrobes oblique. An- 

 tennae as in Smicronyx, club ovoidal, first joint less than one-half its 

 mass. Head spherical ; eyes narrowly oval, more widely separated 

 beneath than in iSmicronyx. Prothorax constricted at the apex, 

 postocular lobes distinct. Scutel very small, scaly. Elytra subcy- 

 lindrical, not conspicuously wider than the prothorax. Prosternum 

 broadly emarginate, without antecoxal ridges. Legs moderately 

 stout, all the tibiae unguiculate at the apex ; tarsi very long, slender, 

 third joint not broadly bilobed, lobes rather narrowly oval ; fourth 

 joint subequal to the preceding three joints ; claws moderately long, 

 slender, divergent, connate at base only. 



The species are cylindrical in form and densely clothed with large, 

 imbricate scales, intermixed with suberect setae and readily distin- 

 guished from Smicronyx by their general habitus and the great length 

 of the fourth tarsal joint. 



