1873.] "±bd [Horn. 



in our fauna, and the design formed by the cinereous pubescence is very 

 distinct, much more evident than in niger, but much less so than in 

 ephippiatus. 



Two specimens are before me from Illinois. 



O. ephippiatus Say. Cure. X. A., p. 16 ; Am. Ent. edit. Lee. Vol. I. 

 p. 283. 



Piceous, moderate^ robust. Rostrum rufous, cylindrical, moderately 

 punctured. Antennse pale rufo-testaceous. Head rugosely punctate, sub- 

 opaque. Thorax broader than long, apex narrower, sides moderately 

 arcuate, median line slightly impressed, surface rugosely punctured and 

 very sparsely cinereo pubescent. Scutellum white. Elytra moderately 

 robust, slightly longer than wide, at base one-third wider than the thorax, 

 striate, striae moderately coarsely punctured, intervals flat, rugulose, 

 clothed with dark brown pubescence and with a large irregular space 

 near the base, and a sub-apical irregular band densely clothed with 

 silvery-white hairs. Body beneath black, shining, sparsely punctured. 

 Legs pale rufous, hind femora piceous. Length .12 inch ; 3 mm. 



The surface color of the elytra is not entirely piceous, that covered by 

 the white hairs being rufous. The conspicuous character of the design 

 will make this species readily known. 



Two specimens are before me, one from Pennsylvania, the other 

 Illinois. 



O. pxiberulus Boh. Eug. Resa, 1839, p. 133. California. 



Unknown to me. 



The species of Orchestes, as far as known to me in our fauna, have the 

 femora unarmed. The larva undergoes its changes in a cocoon, which it 

 prepares in a manner still unknown to science. The same habit has also 

 been noticed by Mr. C. V. Riley in Prionomerus calceatus (Say), (car- 

 bonarius Gyll.), and Phytonomus comptus Say, of which full accounts 

 will doubtless soon appear. 



Rhtssomatus Schonh. 

 Our species are few in number, and are thus distinguished : 

 Body above black, sometimes with obsolete brownish elytral 

 spots. 

 Alternate elytral intervals more elevated; a short humeral 

 carina. 

 Thorax very obliquely strigose, elytra obsoletely macu- 

 late palmacollis. 



Thorax longitudinally strigose, elytra entirely black.. . . lineaticollis. 

 Elytral intervals equal, humeral carina attaining the apex. 



Thorax feebly obliquely' strigose ajqualis. 



Body above brown, surface sparsely pubescent ; humeral 

 carina entire. 

 Thorax obliquely strigose pubescens 



