NEW XYSTODESMID MILLIPEDS — ^HOFFMAN 387 



Gonopods in situ lie parallel and directed cephalad between the 

 bases of the sixth pair of legs. Tips may be in contact or crossed. 

 Telopodite composed of two elements: a smaller spiniform mesial 

 process which projects from the inner side of the lateral process and 

 reaches distad almost to the end of the latter. Lateral process a cy- 

 lindrical, almost straight shaft, the distal third of which is bent 

 cephalad and is flattened and twisted on its axis. 



In life, tergites blackish, keels reddish pink on both corners as well 

 as margin, extreme edges of keels colorless. Underparts of body 

 whitish gray. Head yellowish gray, only the top black. Antennae 

 olive-gray, first and last articles white. 



Type specimens. — Ilolotype and male paratype in the U. S. Na- 

 tional Museum, No. 1808. Six additional topoparatypes in my per- 

 sonal collection. This material was secured by Hobbs, Walton, and 

 "Wilson in June and July 1947. 



Type locality. — Mountain Lake, Giles County, Va. The region is 

 described under Apheloria picta {q. v.) Most specimens taken in 

 the vicinity of the University of Virginia Biological Station. 



Remarks. — In addition to the type locality, Nannaria wilsom is 

 known from the following locality: Virgixia, Floyd County: Rocky 

 Knob Recreation Area, Blue Ridge Parkway, 6 miles southeast of 

 Floyd. Several males and females (RLH No. 7-347-lb) were ob- 

 tained by Hubert Kleinpeter and me on July 3, 1947. They were 

 found in leaf mold and under small stones in a dense thicket of rhodo- 

 dendron and mountain laurel at an elevation of about 3,000 feet. 



The gonopods of wilsoni are not similar to those of any presently 

 known member of the genus. 



Genus SIGMORIA Chamberlin 



Sigmoria Chamberlin, Bull. Univ. Utah, vol. 30, No. 2, p. 7, 1939. (Genotype : 8ig- 

 moria miinda Cliambeilin.) 



Telopodite of male gonopod an upright sigmoidally curved blade. 

 Base of telopodite with a lateral spur or spine. The species are 

 usually large with wide keels. 



SIGMORIA FURCIFERA, new species 



Plate 27, Figures 17, 18 



Diagnosis. — A medium-sized species, distinguished by the structure 

 of the male gonopod, the basal spine of which is bifurcated, and the 

 telopodite blade bearing a small tooth on the mesial margin, which is 

 produced into a large rounded lobe. 



DescHption. — ^Length of holotype, 40, width, 10.5 mm. Body 

 width averages 23 percent of length. Segments 4 through IG of full 



