510 TEETIABY INSECTS OF NORTH AMERICA. 



arising from shallow punctse. Abdomen beyond the elytra of the width of 

 the thorax, and retaining that width for four segments ; the four segments 

 beyond that, and especially the longer penultimate and antepenultimate 

 segments, tapering considerably, the last segment bluntly pointed, triangular. 

 From indications in the clearer parts the abdomen would appear to have 

 been faintly and rather distantly punctate. 



Length of body, 4.5 mm ; width at elytra, l.l mm . 



Green River, Wyoming. Two specimens, No. 78 (Dr. A. S. Packard), 

 No. 3996 (S. H. Scudder). 



STAPHYLINITES gen. nov. (Staphylinus, nom. gen.). 

 STAPHYLINITES OBSOLETUM. 



PI. 8, Fig. 32. 

 Staphylinites olsolelum Scudd., Bull. U. S. Geol. Geogr. Surv. Terr., II, 78 (1876). 



The single specimen obtained is too poorly preserved to determine 

 until further material is obtained to what genus of Staphylinidae it should 

 be referred. Following, therefore, the lead of Prof. Oswald Heer in similar 

 cases, it is referred to a provisional genus Staphylinites. The head, thorax, 

 and abdomen are of equal breadth ; the eyes are round and rather large ; 

 the posterior border of the pronotum is well rounded ; the elytra are simple, 

 about twice as long as broad, truncate, and very broadly rounded, with a 

 large, roundish, very dark spot occupying the whole of the tip. 



Length of fragment, 3.25 mm ; breadth of same, 1.25 mm ; diameter of 

 eyes, 0.45 uim ; length of elytra, 1.25 mm . 



Green River, Wyoming. One specimen, No. 15200 (Mr. F. C. A. 

 Richardson). 



Family HYDROPHILID^S Leach. 



CERCYON Leach. 

 CEKCYON ? TERRIGENA. 



PI. 2, Fig. 21. 

 Cercyon t terrigena Scudd., Rep. Progr. Geol. Surv. Can , 1877-1878, 179B (1879). 



A single elytron with the base broken off appears to represent a species 

 of Hydrophilidae, and perhaps is most nearly related to Cercyon, but of this 



