116 U.S. NATIONAL MUSEUM BULLETIN 2 59 



Remarks. — ^This species is known only from the type locality and 

 nearby Ezells Cave. A limited discussion on the taxonomic history 

 and general ecology of this well-known but rare species can be found in 

 Holsinger (1966). 



Stygonectes longipes Holsinger 



Stygonectes flagellatus (Benedict). — Hubricht, 1943, p. 705 (in part). 

 Stygonectes species. — Reddell, 1965, p. 160. 



Stygonectes longipes Holsinger, 1966, pp. 107-111, figs. 23-42 [Type locality: 

 Cave Without-A-Name, 11 miles NE of Boerne, Kendall Co., Tex.]. 



Material examined 



Texas. — Kendall Co.: Cave Without-A-Name (Century Caverns), male holotype 

 (USNM 112357), female allotype (JRH), J. R. Holsinger and R. Norton, June 

 20, 1964; 1 female paratype, L. Hubricht, May 15, 1940 (LH). 



Diagnosis.- — -Closely allied to S. flagellatus but differing from that 

 species in having antenna 1 up to 3 times the length of antenna 2, by 

 the proportionately longer 1st antenna of the female, less oblique and 

 less convex palmar margin of 1st gnathopodal propod, fewer spine 

 teeth on propods of both gnathopods, proximally less expanded bases 

 of pereopods 5-7, proportionately longer dactyls of pereopods, less 

 convex posterior margins of abdominal side plates, and by the more 

 slender 3rd uropod and telson. Largest male, 9.00 mm (known only 

 from a single specimen); largest females, 10.50 mm. 



The following additions to the original description by Holsinger 

 (1966) are noted: 



Antenna 1 of male (holotype) 75 percent as long as body, that of 

 female varying from 85 percent as long to just slightly longer than 

 body. Mandibular palpal segment 3 with 8 to 10 long setae, segment 

 2 with 9 to 11 setae. Maxilla 1, inner plate with 4 or 5 apical, plumose 

 setae. Maxilla 2, inner plate with 5 or 6 long, obliquely placed, plu- 

 mose setae. Maxilliped, inner plate with 4 or 5 thick, apical spines. 

 Lower lip, inner lobes small. Pereopod 7 equal to or slightly shorter 

 than pereopod 6, between 60 and 70 percent as long as body and 25 

 to 30 percent longer than pereopod 5. Abdominal side plates: poste- 

 rior margins only slightly convex, generally straight in plates 1 and 2, 

 weakly convex in plate 3; posterior corners distinct; ventral margins 

 armed with 2 or 3 spines each. Pleopod 1, inner ramus up to 40 

 percent longer than peduncle. 



Remarks. — 'This species is known only from the type locality where 

 it is apparently rather rare and has been collected only twice from a 

 stream in the lower level of the cave over the past 26 years. 



PECKi Subgroup 



Diagnosis. — Antenna 1 only 50 to 60 percent as long as body. 

 Pereopods 5-7, segments not especially slender. Pereopods 6 and 7 



