Goleoptei-ological Notices, VI. 605 



detached from them except at base, the tarsi moderate in length, 

 with the first and second joints eqnal, clothed with long erect 

 hairs above and long dense and coarse hairs beneath, and the an- 

 terior tibiae have a few long slender external spines. The maxil- 

 lary palpi are long, with the last joint large and in the form of a 

 right-angled triangle, abont twice as long as wide, the terminal 

 joint of the labial palpi being moderately dilated and transversely 

 trnncate at apex. The antennae are long, serrate, with the joints 

 elongate and acutely pointed internally at apex, and the eyes are 

 large, entire, sparsely setose and with the facets very large and 

 convex. The epistoma is large, bisinuate at base, coriaceous at 

 apex, and the labrum strongly transverse, arcuately truncate at 

 tip and with the surface somewhat impressed at the apex. The 

 epipleurre are moderate in width, flat and horizontal, with the 

 plane gradually inflexed posteriorly-, not attaining the apex of the 

 elytra. 



The two species may be distinguished as follows : — 



Eyes separated on tlie front by much less than twice their own width ; pro- 

 thorax very mucli narrower than the elytra 1 . testaceus 



Eyes very much smaller, separated on the front by nearly three times their own 

 width ; prothorax almost as wide as the elytra 2. lecoiitei 



The punctures of the head and pronotum are coarse, irregular, 

 sparse and unevenly distributed, and each is e;j;cavated in the 

 summit of an elevated tubercle, this form being evidently evolved 

 gradually from the asperate puncture, having its anterior margin 

 elevated. 



This genus seems to be confined largely to the desert regions 

 of southern Arizona. 



1. R. testaceus Lee— Ann. Lye. Nat. Hist., N. Y., V, p. 212. 



Elongate, subparallel, strongly convex, pale brown in color, 

 the antennae, legs and under surface, except the sterna, still paler 

 and more flavate ; integuments shining and smooth between the 

 punctures ; pubescence very long, erect, pale yellowish in color, 

 rather sparse but very conspicuous on every part of the body 

 and legs. Head only slightly narrower than the prothorax, 

 blackish at base ; antennae very slender, not incrassate, about 

 one-half as long as the body. Prothorax transversely elliptical, 

 fully three-fourths Avider than long, the sides parallel and evenly, 

 strongly arcuate ; disk evenly convex, very sparsely and coarsely 

 punctate. Elytra nearly twice as long as wide and about one- 



