SUBTERRANEAN AMPHIPOD STYGONECTES 33 



which is about equal to pedimcle in length. Uropod 3: peduncle 

 usually armed distolaterally with 1 spinide; ramus about 1/3 length 

 of peduncle, armed apically with 2 or 3 spines. Telson about 35 to 

 40 percent longer than broad, apical margin with a shallow excavation, 

 each apical lobe armed with about 5 spines. 



Type locality. — Silers Cave, Berkeley Co., W. Va. The type 

 locality is a medium-sized, maze cave developed in Lower Devonian 

 limestone, which crops out as an isolated band west of North Mountain 

 in the vicinity of Back Creek. The two male specimens were taken 

 from a shallow, mud-bottom, seepage-fed pool distant from the 

 entrance. 



Distribution and ecology. — This species is presently known only 

 from its type locality where it is apparently rare. 



Remarks. — It is a pleasure to name this species in honor of Mr. 

 John E. Cooper, who assisted in its collection and who has also assisted 

 in the collection of many other cave forms from the Appalachians. 



Stygonectes stellmacki, new species 



FiGUEE 6 



Material examined 



PENNSYLVANIA. — Centre Co.: Millers Cave, male holotype, J. R. Holsinger and 

 J. Stellmack, May 18, 1965 (USNM). 



Diagnosis. — Moderately large, rather aberrant troglobitic species 

 differing significantly from all other species of Stygonectes by the 

 absence of distal pedimcular process on lU'opod 1. Distinguished 

 from other species of the emarginatus group by the more setose 4th 

 peduncular segment of antenna 2, presence of setae on posterior margin 

 of propod of gnathopod 1, small spines on outside margin of posterior 

 angle of 2nd gnathopod propod, shorter dactyl claws of gnathopods, 

 presence of rastellate setae on segment 5 of both gnathopods, and 

 larger coxal gills. Further differentiated from other species of the 

 emarginatus subgroup by having up to 18 apical spines on telson. 

 Known only from a single male. Length, 14.25 mm. 



Male (holotype): Antenna 1, 50 percent as long as body, about 

 40 percent longer than antenna 2; primary flagellum with 28 segments; 

 accessory flagellum reaching about 1/2 the length of 2nd primary 

 flagellar segment. Antenna 2: pedimcular segments 4 and 5 setose, 

 ventral margin of 4 with a number of long, bristle-like setae; flagellum 

 with 7 segments. Mandibular palpal segment 3 with 11 long setae; 

 segment 2 with 10 to 13 setae. Maxilla 1, inner plate with 6 plumose 

 setae apically. MaxUla 2, inner plate with 8 long, obliquely placed, 

 plumose setae. MaxUliped, outer plate not extending as far as apex 

 of 1st palpal segment. Lower lip, inner lobes distinct but small. 



