Coleopterological Notices, VI. 833 



Elytra in great part blackish, with small feeble rufescent markings to 

 which the unevenly distributed pubescence is principally confined. 

 Intermediate intervals of the elytra not at all carinate ; pronotal rugse 



long and oblique paliuacollis Say 



Intermediate intervals feebly and incompletely' carinate; pronotal rugse 



less oblique niedialis n. sp. 



Elytra in great part pale, the pubescence longer, more evenly distributed 

 and very conspicuous ; pronotal rugse oblique pul>esceiis Horn 



Alternate intervals not at all carinate. 



Sermysatus n. sg. 



Eyes rather narrowly separated on the front prtlinosus Boh. 



Eyes widely separated, the beak less elongate and less slender. 



Body rather broadly oval, the abdomen distinctly punctate OTaliS Csy. 



Body narrowly oval and much smaller, paler in color, the abdomen only 

 slightly punctate parvuliis n. sp. 



In the United States the genus Ryssematus is confined to the 

 eastern faunal regions, extending into the Sonoran province. No 

 species is known to occur within the true Pacific coast region. 



- R. graiidicollis. — Broadly oval and very convex, deep black through- 

 out, the antennseand tarsi only slightly piceous; setse along the elytral ridges 

 very minute and inconspicuous. Head scarcely one-third as wide as the pro- 

 thorax, deeply, densely punctate and with short fulvous hairs, the eyes large, 

 bi'oadly sinuato-truncate anteriorly' and margined with a deep groove behind, 

 rather narrowly separated on the front; beak thick, as long as the head and 

 prothorax, feebly arcuate, slightly thinner and somewhat bent near the apex, 

 strongly carinate above from the interocular fovea to the anteunse, finely, rather 

 sparsely punctate toward apex, longitudinally rugose, dull and more densely 

 punctate thence to the base especially at the sides; autennaj inserted just be- 

 yond the middle, the basal joint of the funicle about as long as the next 

 two. Prothorax large, about twice as wide as long, strongly rounded at the 

 sides, the latter becoming parallel and arcuate in about basal third, strongly 

 convergent anteriorly ; apex arcuate and distinctly less than one-half as wide as 

 the base, the latter transverse; disk closely, longitudinally rugose, the ruga» 

 much disintegrated at the sides and on the flanks beneath, becoming much 

 confused, more feeble and somewhat dull, the feeble apical constriction more 

 coarsely and deeply sculptured as usual. Elytra distinctly longer than wide, 

 only very slightly wider than the prothorax, the sides slightly convergent and 

 feebly arcuate from the large and moderately prominent humeral protuberances 

 to the apex, the latter somewhat narrowly rounded; disk very dull, the obtuse 

 crests of the feebly elevated carinse alone polished ; punctures rather shallow, 

 elongate and distant, connected by fine, scarcely impressed but more shining 

 lines and becoming very small toward apex. Abdomen coarsely punctate at 

 base, thence finely, rather densely so to the fifth segment, which is very 



