1896.] NATURAL SCIENCES OF PHILADELPHIA. 261 



Pterodesmus brownellii. 



Last segment exceeded and included by the penultimate, the pos- 

 terior sinus of which is nearly square, longer than broad ; copulatory 

 legs excised at apex, the posterior lobe longer, laterally excised, the 

 anterior broad, with three or four short t^eth ; length 28 mm., width 

 7 mm. 

 Gypsodesmus prninosus. 



Dorsum very flat, the carinse curved gently upward toward the 

 posterior corners, and as high as the middle of the segments ; last 

 segment subequal to the penultimate in length, the sinus of the latter 

 broader, the sides diverging ; copulatory legs with the dorsal ramus 

 long, strongly decurved and turned mesad ; length 16 mm., width 

 4 mm. 



Lampodesmns volvatas. 



Dorsum distinctly convex, the carinse slightly decurved, nearly in 

 the direction of the dorsal arch ; last segment and copulatory legs 

 somewhat as in Gypsodesmus; male legs crassate, especially the 

 anterior ; two large and conspicuous processes from the sternum of 

 the sixth legs of males ; length 24 mm., width 5.7 mm. 



Compsodesmns pnlcher. 



About as convex as the last, but the sides sloping more directly 

 from the middle ; no processes from the sixth segment ; male legs 

 scarcely crassate ; copulatory legs very simple, apically somewhat 

 cup-shaped ; penultimate segment with sinus broader ; length 24.5 

 mm., width 6.5 mm. 



Clioridesmns citus. 



Last segment nearly or quite concealed under the penultimate ; 

 length 5.5 mm., width 1.5 mm. 



Scolodesmus grallator. 



Dark vinous, a narrow, poorly-defined median spot on each pos- 

 terior subsegment, giving the effect of a pale median line ; legs and 

 antenna? pinkish or yellowish ; length 28 mm., width 2.5 mm., the 

 first segment as broad as any, the other anterior segments distinctly 

 narrower ; locality, Monrovia. 



Habrodesmus laetns. 



Length of male 27 mm., width 2 mm.; width of female 3 mm. 

 Stylodesmas horridus. 



Length 10 mm., width 3.2 mm. ; the processes of the seventeenth 

 and eighteenth segments project far behind the nineteenth, which 



