OF PHILADELPHIA. 27 



at their bases, nor separated by a contraction ; eyes black, lon- 

 gitudinally sublunate ; ultimate segment unarmed, longer than the 

 penultimate one, rounded at tip and blackish. 



Length nearly half an inch. 



Resembles ./. im^nxsiis in the character of lateral impressed 

 lines, but is distinct by tlic unarmed terminal segment; I found 

 it rather common on the Eastern shore of Virginia under the 

 bark of Pinus variabilis. 



Genus POLYDESMUS Latr. 



Body elongated, linear depressed, segments with a pronunent 

 margin; eyes oboletc; feet many; antennae, second joint shorter 

 than the third. 



1. P. SERUATUS. — Segments with a double transverse series 

 of slightly raised squamiform elevations. 



My Cabinet. 



Segments depressed above, with four minute scrratures each 

 aide, first segment transversely oblong oval, somewhat angulated 

 on each side behind, second, third and fourth segments with but 

 three scrratures [107] first rather longer than the second, and with 

 a single obsolete serrature near the posterior angle, each segment 

 with a double transverse series of twelve slightly elevated, squami- 

 form divisions, anterior segment with but a single series ; head 

 glabrous, an impressed longitudinal line on the vertex ; antennae, 

 feet and terminal segment hairy; color, above reddish-brown, 

 beneath yellowish white. 



Common in similar situations with the preceding. 



Julus viryinicnsLs of Drury, is also rather common ; it appears to 

 be synonymous with ./. tridentata of authors. I have found spe- 

 cimens double the usual size in the Southern States. It seems 

 also to vary in having only the second joint of the feet mucro- 

 nate, and in being destitute o^ the robust ventral spines between 

 the feet. 



2. P. GRANULATUS. — Segments granulated, granules subequal, 

 arranged in four series. 



My Cabinet. 



Body with short hair, pale tinged with red beneath, and feet 

 paler ; head dusky, with short dense hairs ; labrum whitish ; seg- 

 ments somewhat convex, granulated, granules rounded, or longi- 

 1821.] 



