258 PROCEEDINGS OF THE ACADEMY OF [1896. 



Comodesmns lanatas. 



Autenni>? distinctly clavate ; last segment decurved. the immedi- 

 ate apex small, projecting, truncate ; lateral carime pre;?ent only as 

 a longitudinal row of large tubercles, above which the tubercles are 

 gradually smaller ; length 8 mm., width 1 mm. 



Thelydesmus dispar. 



Antennie distinctly clavate ; first segment nearly as wide as the 

 second, scarcely concealing the head in front ; segments with four 

 regular transverse rows of conic piliferous granules ; carinoe moder- 

 ately broad, somewhat narrowed toward the margin. coai"sely den- 

 tate all around by reason of the prominent granules, the largest of 

 which is located at posterior corner ; last segment triangular in out- 

 line, the edges dentate with setiferous tubercles, the apex narrow, 

 with a small tubercle ; females nearly black above, 18 mm. long, 

 B.2o mm. broad ; males quite black above, less convex and more 

 slender than the female, and with proportionately broader carinte ; 

 length of male 15 mm., width 2.75 mm. ; locality, Mt. Coffee; females 

 not rare. 



Discodesmus senex. 



Smaller and more slender than Comode^mu? ; dorsum densely 

 granular-tuberculate, the prominences subequal in size and setiferous ; 

 lateral carinse nearly wanting, the segments slightly thicker at the 

 sides and with larger tubercles ; repugnatorial pore located above 

 the lateral row of tubercles ; color white. 



Prepodesmus tigrinus. 



This and its congeners have the copulatory legs with a large 

 needle-like straight or slightly curved spine from the ventral or 

 median face. The present species has the anterior margin of the 

 first segment, the anterior lateral apices of the second and third 

 segments, and the carinse, or at least the posterior part of the carina 

 of poriferous segments bright yellow, with the remainder of the body 

 black ; legs and antennie reddish-yellow ; length of female 42 mm., 

 width 5 mm. ; antennae and longest legs 9 mm. ; males distinctly 

 smaller. 



Prepodesmus mimus. 



Of the same form and size, but with the anterior margin of the 

 first segment, the carina of the second and third, and the whole pos- 

 terior subsegments of the poriferous segments blight red ; legs and 

 antenna reddish ; locality, Muhlenburg Mission. 



