.The Pselaphid^ of North America. 261 



Abdominal carina; separated by not more than one-half the seg- 

 mental width. Color, dark brown, elytra and base of anten- 

 n;e bright red. .-..-.. discolor. 



c- Prothorax punctulate. 



Abdominal carina: including less than one-half the segmental 

 width. $ femoral spine excessively long and sharp, in the 

 middle of the thigh. . - . . . formiceti. 



D. ABNORME, Lec. Black compact, not very visibly punct- 

 ulate, pubescence long, dark, erect. Elytra varying from 

 black to dark red, legs palpi and antenna dull red. Length, 

 1.5 mm, Plate VIII., Fig. 40. 



Head, excluding the eyes, quadrate above, frontal margin 

 slightly and broadly emarginate inter-antennai space concave, 

 occipital foveai large, connected with the frontal concavity by 

 faint convergent sulci, one on each side, which are sometimes 

 absolute. Eyes prominent, facets^ coarse. Palpi with the 

 third joint very stout, one half longer than thick, acutely 

 pointed. Antennce as long as the head and prothorax, the joints 

 nearly equal rounded, the basal ones more oblong. The fifth 

 to the eighth are more transverse, ninth and tenth gradually 

 increasing in width, also transverse, eleventh ovate, not 

 acuminate, one-third longer than wide. Prothorax fovea 

 small. Elytra one half longer than the prothorax, the width 

 across the high prominent shoulders but little less than the 

 sutural length; across the tip they are one-fourth wider. The 

 discal and sutural lines are very deep the intervals evenly 

 convex. Abdomen short, first dorsal three times as wide as 

 long, the carinse nearly entire including one-half of the entire 

 width, borders broad, parallel. Legs strong, intermediate 

 thighs with a rounded gouged channel from the upper edge 

 posteriorly to the distal end, leaving a small sharp spine. 



Habitat. Northern States east of the Missouri river. 

 Canada. 



D. EXSECTUM, Brend. Reddish - piceous, robust, some- 

 what more slender than D. abiiori)ie, pubescence semi-erect, 

 grayish-brown. Length 1.7 mm. Plate VIII., Fig. 41. 



