50 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



segments paler. Antennae with all segments longer than wide, 

 eleventh less than one-half longer than tenth. Third segment 

 of maxillary palpi moderately enlarged, fourth distinctly coni- 

 cal but acicular. Pronotum with sides nearly straight in apical 

 two-thirds ; not distinctly wider than elytra. Elytra very finely but 

 rather evenly submuricately punctured; without sutural series, mar- 

 ginal series of four punctures; and with additional discal puncture 

 near humerus. Abdomen above very indistinctly punctured ; beneath 

 a little more coarsely than elytra, with numerous large bluntly 

 muricate pu.uctures on the apical segments. Eighth tergite of male 

 rounded; eighth sternite triangularly notched, the notch a little 

 wider than deep, apex broadly rounded, angles distinct. Eighth 

 tergite of female 4-lobed, the lobes about equal in length, the median 

 pair narrower and separated almost to base ; eighth sternite broadly 

 rounded, with a single series of silken hairs. 



Type locality. — Buena Vista, Colo. 



Types. — Holotype (a male from Buena Vista, Colo., 4^7, collection 

 of Hubbard and Schwarz) and 2 paratypes, U.S.N.M. no. 50890; 1 

 paratype in collection of the writer; paratypes from Colorado (Red 

 Cliff), Nevada (Lake Tahoe), and Saskatchewan (Swift Current). 



Remarks. — This species also probably owes its rarity to lack of 

 collecting. It has been found only at considerable altitudes. 



TACHYPORUS JOCOSUS Say 



1834. Tachyponis jocosus Say, Trans. Amer. Phil. Soc, vol. 4, p. 4G6. 



1840. Tachyporns arduus Ekichson, Genera et siJecies staphylinorum . . ., 



p. 237. 

 1877. Tachyporus jocosus Say, Horn, Trans. Amer. Ent. Soc, vol. 6, p. 104. 



Form robust and convex. Rufotestaceous, head darker; base of 

 antennae, trophi, prothorax, elytra, and legs generally paler. An- 

 tennal segments expanded from the sixth but all longer than wide, 

 last about one-half longer than the tenth. Third segment of max- 

 illary palpi enlarged throughout its length but more apically, fourth 

 segment acicular but short and a little larger at base. Pronotum 

 with sides arcuate throughout; not distinctly wider than elytra. 

 Elytra very finely and rather irregularly submuricately punctured, 

 without sutural series. Abdomen above more sparsely punctured, 

 beneath more coarsely and with a few of the large bluntly muricate 

 punctures on the apical segments. Eighth tergite of male prom- 

 inently evenly rounded; eighth sternite triangularly notched, notch 

 a little wider than deep with the apex narrowly rounded, angles 

 rounded. Eighth tergite of female 4-lobed, lobes equal in length; 

 the middle lobes narrower and separated nearly to base; eighth 

 sternite prominently evenly rounded, with a single series of silken 

 hairs. 



