EEVISIOlSr OF GENUS TACHYPORUS — BLACKWELDER 43 



Size 2 to 3 mm, depending chiefly on the degree of extension of the 

 abdomen. Head above smooth, shining, extremely minutely and in- 

 distinctly punctate ; beneath opaque, gula smooth, shining, and some- 

 what elevated. Antennae a little longer than the head and pronotimi, 

 segments gradually expanded apically, last segment obliquely trun- 

 cate. Pronotum smooth, shining, impunctate except for the marginal 

 punctures. 



TACHYPORUS NITIDULUS (Fabricius) 



1781. Staphi/Iinus niUdulus Pabkicius, Species insectorum . . . , vol. 1, p. 337. 

 1792. Oxyporus brunneus Fabricius, Entomologia systematica . . . , vol. 1, 



pt. 2, p. 535. 

 1834. Tachyporus faher Say, Trans. Anier. Phil. Soc, vol. 4, p. 468. 

 1877. Tachyporus scitulus Erichson, Horn, Trans. Amer. Ent. Soc., vol. 6, 



p. 105. 

 1877. Tachyporus hrunneus (Fabricius) Horn, Trans. Amer. Ent. Soc, vol. 6, 



p. 105. 

 1916. Tachyporus niUdulus (Fabricius) Be31nhaiter and Schubert, Coleopte- 



rorum catalogus, pars 67, p. 475. 



Form depressed, narrow, and parallel. Uniformly rufotestaceous, 

 varying to rufopiceous occasionally, head frequently darker and the 

 elvtra usually paler. Antennae with segments 7 to 10 wider than 

 long. Third segment of maxillary palpi short and expanded dis- 

 tally, fourth very short but conical and large at base. Pronotum 

 with sides regularly arcuate ; slightly wider than the elytra. Elytra 

 very finely irregularly punctured, the punctures indistinctly or 

 bluntly submuricate; a row of two or three large punctures along 

 the suture; lateral series with four punctures, and an additional 

 discal puncture near the humerus. Abdomen above punctured like 

 the elj^tra or a little less distinctly ; beneath with a few larger muri- 

 cate punctures on the apical segments. Eighth tergite of male with 

 a feeble, rounded lobe; eighth sternite with a triangular notch, 

 about as deep as wide, with the apex rounded. Eighth tergite of 

 female divided into four lobes equal in length, the median pair 

 narrower and separated one-half toward base; eighth sternite very 

 feebly emarginate at middle and with a group of silken hairs on 

 each side of the emargination. 



Type locality. — Not recorded in original description. 



Localities represented. — Massachusetts, New York, New Jersey, 

 Pennsylvania, Maryland, District of Columbia, Virginia, Kentucky, 

 Ohio, Michigan, Indiana, Iowa, Nebraska, North Dakota, Louisiana, 

 Kansas, Colorado, Texas, New Mexico, Wyoming, Utah, Idaho, Cali- 

 fornia, Oregon, Washington, Ontario, Lake Superior, Alberta, 

 Saskatchewan, British Columbia, Europe. 



Remarks. — A widespread species, probably occurring throughout 

 our territory, though no specimens from the Southeastern States 



