The PselaphidvE of North America. 41 



third as long as the segment and separated by one-fourth of 

 the width. Length 1.4 mm. 



A. TESTACEUM, Cascy. ? abdomen more pointed, head 

 longer than in A. 7'obustnlum, elytral discal Hne one-half the 

 length; abdominal basal carina; one-third of the segmental 

 length and separated by one-third of the width; otherwise like 

 A. robustidum. Length 1.2 mm. 



Rhexidius, Casey. (Euplectus Lee.) 



Head very transverse, frontal margin crenate, prothorax 

 with linear grooves, antenna; straight, their insertion distant, 

 posterior coxce contiguous, tarsi with two unequal claws. 

 Elytra with three abbreviated discal Hues and a subhumeral 

 fovea. 



R. GRANULOSUS, Casey. Depressed, of the color of new 

 leather, pubescence thin, short, coarse, the body granulated 

 over the entire surface with minute tubercles. Length i mm. 

 Plate XI, Fig. 100. 



Head twice as wide as long; base slightly sinuate, occiput 

 feebly impressed in the middle, tempora straight, convergent; 

 eyes coarsely granulated, distant from the lateral margin of 

 the vertex, frontal margm broadly arcuate and crenulated by 

 fine longitudinal impressions; occipital fove^e far apart, near 

 the tempora, connected by a fine arcuate sulcus parallel to the 

 frontal margin. Antemuv. slightly shorter than the head and 

 prothorax together, first and second joints cylindrical, as long 

 as wide; second smaller, more rounded;- third to eighth nar- 

 rower, transverse; eighth tw'ice as wide as long; ninth and 

 tenth gradually larger, transverse, trapeziform; eleventh as 

 long as the live preceding together, scarcely wider than the 

 tenth, conical from the middle of its length, base truncate. 

 Prothorax widest in the middle, as wide as the head, sides 

 nearly straight toward the base and the neck, arcuate in the 

 middle; base arcuate, two-thirds as wide as the disk, and one- 

 half wider than the neck; disk as wide as long, median sulcus 



