Coleopterological Notices, IV. 601 



basal joint of the club with a short acute erect tooth on the inner 

 side. This is a very distinct and interesting species. 



The female from Colorado is very densely squamose above, and 

 the species probably varies in vestiture to as great a degree as 

 salebrosus. 



CENTRIXOPUS n. gen. 



In this genus the beak is long, very slender and strongly arcuate, 

 with the antennae inserted near basal third, the scape short and ex- 

 tending almost to the eyes, the basal joint of the funicle long, the 

 second short and the club rather small, with its basal joint unusually 

 large. 



The mandibles are well developed, quite distinctly notched within 

 near the apex, but with the external outline nearly straight; when 

 closed they are scarcely at all decussate and form together an ante- 

 riorly prominent ogive. The prosternum is deeply canaliculate 

 along the middle in the female, and with a still deeper elongate- 

 oval excavation in the male, being armed in the latter sex before 

 each coxa with a well-developed, abruptly bent, corneous process. 

 The anterior coxae are somewhat prominent and narrowly separated, 

 being appreciably more approximate in the male than in the female. 

 The mes-epimera are exposed from above and the scutellum is very 

 small and densely squamose. The pygidium is completely covered 

 in both sexes, and the met-episterna moderately wide and generally 

 more densely squamose than the adjoining surfaces. 



The form of the bod}^ is somewhat oblong-oval, the humeral callus 

 feebly developed, and the general habitus reminds us considerably 

 of Limnobaris grisea. In the male the abdomen is broadly im- 

 pressed in the middle toward base, the impressed area clothed with 

 more slender, sparser but recumbent squamules. Our two species 

 may be identified by the following characters: — 



Prothorax feebly transverse ; pronotum not conspicuously trivittate, the scales 

 uniform in coloration but not in size and density ; elytra abruptly much 

 wider than the prothorax, the alternate intervals simply more broadly 

 squamose 1 lielvilillS 



Prothorax more transverse ; pronotum with three distinct vittse, the squam- 

 ules of the intermediate regions not only finer and sparser but darker in- 

 color ; elytra but slightly wider than the prothorax, with the alternate 

 intervals much more broadly, densely and conspicuously clothed with 

 paler scales 2 alternatus 



