The Pselaphid^ of North America. 271 



Frontal fovea normal. S antennne in some specimens with the 

 front joint very small, triangular, fifth more than twice as 

 wide as the first, transverse, hemispherical or cup-shaped, 

 sixth of the same form but a little smaller, seventh to ninth 

 subequal, smaller of the same shape, tenth as large as, and 

 like the sixth, the last obovate and as wide as the tenth. In 

 others the fourth joint is larger, the fifth only one-half wider 

 than the first, sixth to ninth a little narrower, tenth and 

 eleventh in proportion. The posterior tibise are more or less 

 flattened. Two forms are recognized by authors. Elytra 

 more red; Washington, Idaho, Vancouver's Island, British 



Columbia. - albtnica. 



El}tra usually darker. Manitoba, Canada, and adjoining 

 regions. fropinqna. 



2* Orange or ferruginous. 



Dark red, elytra red, antenna; and legs paler, prothorax and 

 elvtra minutely feebly punctuate, foveie very small impres- 

 sed on the sides. ^ antennae with joints two and five equal, 

 larger, fourth and eighth smallest, sixth to ninth subequal, 

 decreasing in size and obliquely truncate. Eleventh obliquely 

 pointed. Length 1.4 mm. . - - - informis. 



Ferruginous foveie very small, length 1.2 mm. (2) - subtilis. 

 (Unknown to us — perhaps identical with ijiformis.) 



Piceous elytra red, legs and antennce darker, punctulate, male 

 antennre with joints one to three obconical, decreasing in 

 size, fourth to seventh transverse, differently formed, increas- 

 ing in width, the seventh widest. Eighth joint transverse, 

 equal to the fifth. Ninth joint equal to the second, obconical 

 like the tenth; eleventh long. Length, 1.2 mm. tninidecornis. 



Red, elytra, and legs paler, impunctate. <^ antennae with the fourth 

 joint four times wider than long, fifth and sixth gradually 

 narrower, seventh equal to the first, eighth smallest, quadrate. 

 The remaining three joints gradually increase in size, the 

 ninth and tenth being obconical, the eleventh long. Length, 

 1.4 mm. tiimorosa. 



Frontal fovea normal, {l':) antennje with the fifth and sixth joints 

 stouter, elongate oval, ninth and tenth nearly as wide as the 

 last joint. Hind tibire curved and flattened. May be identical 



with tumida. complecteus. 



1 8 Frontal fovea at the bottom of a transverse impression; in the male it is 

 very minute or entirely wanting. 



Elytra and prothorax densely punctured, pubescence long, dorsal 

 lines convergent, basal abdominal carina not visible, anten- 

 nse stout; in the J the joints sixth to eighth are narrower 

 than the fourth and fifth. Color, light brown, legs paler. 

 Length, 1.2 mm. California. ... - compar. 



