CoIeo2:>te7'oIogical Notices, IV. 443 



Texas (near Austin). 



A distinct species, easily distinguishable by its rather small size, 

 obese form and peculiar thick clavate bristles. Tog-ether with 

 diqjlex, it should be placed at the end of LeConte's group "I b," 

 but there are no described species with Avhich either of them can be 

 compared. 



The genera allied to Ryssematus, which have thus far occurred 

 within the United States, may be readily distinguished as follows: — 



Intermediate coxre narrowly separated ; second ventral segment not as long 

 as the next two combined. 

 Tarsal claws unequally cleft, approximate but not connate at base. 



Ryssematus 

 Tarsal claws simple, stout, subparallel, subconnate at base, the suture dis- 

 tinct Clialcoderniiis 



Intermediate coxse widely seijarated, the mesosternum between them depressed 

 and flat ; second ventral segment longer than the next two ; tarsal claws 

 small, slender, approximate at base but free Clialepoiiotus 



RYSSEMATUS Chey. 



B. pruinosus Sch. is somewhat aberrant in its more elongate-oval 

 form and in the longer flatter abdominal segments, also in its very 

 slender beak, joined at the lower part of the head at an obtuse angle. 



R. ovalis n. sp. — Evenly oval, strongly convex, shining, glabrous, dark 

 rufo-testaceous throughout. Head strongly convex, finely, densely punctate, 

 with a small interocular fovea ; eyes moderate, unusually distant, separated 

 by rather less than their own width above ; beak rather slender, evenly, 

 moderately arcuate, shining, finely, sparsely lineato-punctate, a little longer 

 than the head and prothorax ; antenna inserted just behind the middle, the 

 scrobes horizontal, nearly attaining the lower portion of the eye ; funicle long, 

 slender, all the joints longer than wide, the first almost as long as the next 

 three, second but slightly longer than the third, the club moderate, scarcely 

 longer than the three preceding joints, oval, abrupt. Prothorax not quite twice 

 as wide as long, the apex strongly constricted and tubulate, less than one-half 

 as wide as the base ; sides evenly convergent and arcuate from the base, the 

 latter transverse, broadly, feebly bisinuate and with the usual narrow decliv- 

 ous margin ; disk finely, deeply strigilato-punctate, the strigae externally 

 oblique anteriorly, the median line very fine and not distinctly cariniform. 

 Elytra slightly wider than the prothorax and nearly three times as long, 

 oval, the sides becoming parallel near the base, the humeri obliquely, feebly 

 rounded externally to the prothorax and not exposed at base; disk with 

 Annals N. Y. Acad. Sn., VI, Sept. 1892.— 30 



