26 U-S. NATIONAL MUSEUM BULLETIN 2 59 



River. Three ovigerous females, ranging is size from 9.75 mm to 

 13.50 mm, were collected from Com"t Street Cave in August 1965. 

 Two females were carrying eight and ten eggs each, whUe the third 

 had eight newly hatched yoimg in the brood pouch. The young 

 measured 3.00 mm m length. 



Remarks. — All but one specimen (1 out of 39) of the collection 

 made by Leslie Hubricht in Court Street Cave in August 1939, were 

 of a different species (S. spinatus). My own collection from this 

 cave in August 1964, residted in 17 specimens of S. emarginatus and 

 only one specimen of S. spinatus. Hubricht's figure (1943, pi. 9) 

 of an "immature telson" may not belong to ^S*. emarginatus, but 

 might have been figured from a specimen of S. spinatus. 



Stygonectes mundus, new species 



Figure 3 



Material examined 



VIRGINIA. — Bath Co.: Witheros Cave, holotype female, V. B. Sheflfer, Mar. 22, 

 1941 (USNM); 1 male and 1 female paratype, J. P. E. Morrison, Mar. 23, 1941 

 (USNM). Additional material: one female, tributary to the Cow Pasture River, 

 4 miles SE of Clifton Forge, Alleghany Co., by R. L. Hoffman, June 1, 1950 (LH). 



Diagnosis. — Distinguished from S. emarginatus by smaller size and 

 from all species of the emarginatus subgroup by having fewer spines 

 on posterior angle of 1st gnathopodal propod and the convex and 

 imexcavated apical margin of the telson. Sexes generally similar. 

 Largest male, 8.00 mm; largest female, 8.25 mm. 



Antenna 1 about 40 percent longer than antenna 2, approximately 

 50 percent as long as body; primary flagellum with up to 18 segments. 

 Antenna 2: peduncular segments 4 and 5 not as setose as in S. 

 emarginatus; flagellum of 6 segments. Mandibular palp segment 3 

 rather slender, with about 8 long setae; segment 2 with 7 or 8 setae. 

 Maxilla 1, inner plate with 7 apical, plumose setae. MaxUla 2, inner 

 plate with 7 long, obliquely placed, plumose setae. Maxilliped, 

 outer plate reaching nearly to apex of 1st palpal segment. Lower 

 lip with small inner lobes. 



Gnathopod 1: propod palmar margin slighly convex, oblique, 

 armed with a double row of 9 or 10 spine teeth; posterior angle with 

 2 large, unequal spines on outside, 2 smaller spines on inside; posterior 

 margin short and without setae; lateral setae in transverse rows, 

 singly inserted; claw of dactyl long. Gnathopod 2: propod palmar 

 margin less convex, less oblique, armed with a double row of 9 or 10 

 spine teeth; posterior angle with 1 large spine on outside, 2 smaller 

 spines on inside; posterior margin with 3 sets of setae; lateral setae 

 singly inserted; dactyl claw long. Coxal plates of pereopods 2 and 3 

 with about 5 or 6 marginal setae and spinules each: that of pereopod 4 



