52 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



tiire near the humerus. Abdomen above less finely and more regu- 

 larly punctured than elytra, penultimate segment with transverse 

 row of larger punctures; beneath as above, with numerous large 

 bluntly muricate punctures on the apical segments. Male unknown. 

 Eighth tergite of female 4-lobed, the median incisure two-thirds 

 as deep as laterals, median lobes narrow, lateral triangular, equal 

 in length; eighth sternite broadly rounded, with a single series of 

 silken hairs. 



Ty'pe locality. — Oregon. 



Types.— Ro\oiy]iQ (a female from Oregon collected by C. V. Riley) 

 and 5 paratypes, U.S.N.M. no. 50892; 1 paratype in collection of the 

 writer. Paratypes from Oregon (Corvallis, Scio, Klamath County) 

 and California (Eureka). 



Other specimens. — One other specimen from Placer County, Calif., 

 is assigned to this species. It has the pronotum not distinctly 

 clouded and the elytral spot less definite and regular. 



TACHYPORUS ACAUDUS Say 



1834. Tachyporus acaudus Say, Trans. Amer. Phil. Soc, vol. 4, p. 467. 



1866. Tachyporus maculicollis LeConte, Proc. Acad. Nat. Sci. Philadelphia, vol. 



18, p. 374. 

 1877. Tachyporus chrysomeUnus var. maculicollis LeConte, Hokn, Trans. Amer. 



Ent. Soc, vol. 6, p. 126. 

 Tachyporus heterocerus LeConte, MS. 

 Tachyporus angusHcolUs Faxxvel, MS. 



Form robust and convex. Piceous; antennae, trophi, prothorax, 

 elytra, and legs testaceous ; apical half of antennae fuscous ; prono- 

 tum clouded at middle. Antennal segments all longer than wide, 

 eleventh not quite twice as long as tenth. Third segment of maxil- 

 lary palpi feebly enlarged, fourth acicular and more than half as 

 long as third. Pronotum with sides straight in apical half; not 

 distinctly wider than elytra. Elytra very finely, irregularly, and in- 

 distinctly submuricately punctured; without sutural series; lateral 

 series variable but with an additional discal puncture near humerus. 

 Abdomen above more distinctly and regularly punctured, the punc- 

 tures excavated behind; beneath punctures still coarser, and with 

 numerous large bluntly muricate punctures on the apical segments. 

 Eighth tergite of male produced into an obtusely rounded lobe; 

 eighth sternite triangularly notched, the notch a little wider than 

 long, the apex rounded, angles distinct. Eighth tergite of female 

 4-lobed, the median pair narrower and separated two-thirds to base; 

 eighth sternite rounded and with a single series of silken hairs. 



Type locality. — Quebec, Canada. 



Localities represented. — The following localities are represented 

 in the present collections: Massachusetts, Connecticut, New York, 



