54 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



regularly and evenly punctured; beneath more strongly excavated, 

 and with numerous large bluntly submuricate punctures on the apical 

 segments. Eighth tergite of male feebly obtusely triangular but 

 rounded; eighth sternite rather strongly triangularly notched, the 

 notch about as wide as deep with the angles narrowly rounded. 

 Eighth tergite of female equally 4-lobed, the median pair narrower 

 and separated to base; eighth sternite broadly rounded but very 

 minutely notched at center, series of silken hairs apparently 

 continuous. 



Type locality.— Oswego^ Clackamas County, Oreg. 



Types.— HoMype (a male from OsAvego, Oreg., collected by J. A. 

 Allen, George M. Greene collection) and 1 paratype (same data), 

 U.S.N.M. no. 50894; 1 paratype (same data) in collection of the 

 •writer. 



Remarks.— The three specimens all lack both antennae. They 

 are very similar to the specimens assigned to Sharp's species 7mxi- 

 canus from northeastern Mexico. 



TACHYPORUS MEXICANUS Sharp 



1883. Tachyporus mexicantis Sharp, Biologia Centrali-Ainericana, vol. 1, pt. 

 2, p. 311, pi. 7, fig. 12. 



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

 elytra, and legs testaceous; distal half of antennae infuscate; pro- 

 notum clouded at center, elytra with humeral stripe clouded. An- 

 tennal segments all longer than wide, eleventh less than twice as 

 long as the tenth. Third segments of maxillary palpi feebly en- 

 larged, fourth acicular. Pronotum smooth, shining, impunctate; 

 sides straight in apical half; not wider than the elytra. Elytra very 

 finely and irregularly submuricately punctured, punctures frequently 

 arranged in transverse groups; without sutural series; lateral series 

 of four punctures; and with an additional discal puncture near the 

 humerus. Abdomen above punctured a little less finely and more 

 sparsely and regularly than elytra; beneath similarly bu.t with 

 numerous of the large bluntly submuricate punctures on the apical 

 segments. Eighth tergite of male rather narrowly rounded ; eighth 

 sternite triangularly notched, notch a little wider than deep, apex 

 rounded, the angles rather obsolete. Eighth tergite of female 4-lobed, 

 the median pair narrowly separated only two-thirds to base ; eighth 

 sternite with an exceedingly feeble emargination at middle, but with 

 a single continuous series of silken hairs. 



Type locality.— SaltiWo, in Coahuila, Mexico. 



Other specimens. — One specimen each from northern Mexico and 

 western Texas have been tentatively assigned to this species. They 

 do not carry any other data. 



U.S. GOVERNMENT PRINTING OFFICE: I93S 



