124 TERTIARY RIIYNCIIOrHOROUS COLEOl'TERA. 



ally to refer it here. UiitVirtuiiatelv it is in it complete, but it is apparently 

 about two and a third times long-er tlian liroad, tapers rather rapidly in the 

 iipical third by the stronii' curvature of the outer marg-in, has a rectangular 

 apex, and is furnished with ten series of impressed ])unctate stria', the })uncta 

 rather large, rather dee]), but not sharp, and the interspaces smooth and 

 alternately flat and strongly arched so as then to form didl carinae, a feature 

 reminding one somewhat of Kliyssomatiis. 



Length of elytron, 4-(;"""; breadtli. 2™™. 



Roan mountains, western ('olora(h>, from the richest beds at summit of 

 bluffs facing head of East Salt creek. ( )ne specimen. No. lU2(j, U. S. Geo- 

 logical Survey. 



RHYSOSTERNUM (pu(j6?,GT£pvov), gen. nov. 



Having the general aspect of Rhyssomatus (to which the late Dr. Le- 

 Conte called my attention), but with an unusually long l)eak, pi-ominent 

 postocular lobes, and altogether different sculpturing of tlie elytra ; it would 

 appear, liowever, to l)elong in tlie same group. Body ovate, somewhat 

 elongate. The beak is longer tliau tlie head and thorax together, sometimes 

 more than twice as long as the prothorax, and strongly arcuate. The an- 

 tenna? are not very clearly ])i-eserved, but the funiculus and club together 

 are fully two-thirds as long as the l^eak, and apparently the first joint of the 

 former is long, while the succeeding are much shorter and subequal, the final 

 ones lialf as broad again as the second. The prothorax is nuudi liighertlian 

 long, with prominent postocular lol)cs, due largely to a dee}) angular rounded 

 emarffination at the middle of the sides; its surface is sinuateh' and loiio-i- 

 tudinally strigose, as in Rhyssomatus. The elytra are simply but \cr\- dis- 

 tinctly punctato-striate, without carination; tlie tenth stria is alilireviated. 



Two species are known, botli from Florissant. 



Table iif thi' sjx'cirs of h'hi/sosteniiirn. 



Beak more than twice as loug as tlic prothorax, leacbiug tlie eiul of the iiietasteiiuiiu; 



piuicta of the elytral stria* distiuctly longitudinal loit(/iroxire. 



Beak less tliaii twice as long as the prothorax, reaching the end of the inesosteiiunn; 



puucta of the elytra! stiia' distinctly circular wteiinthilv. 



