SUBTERRANEAN AIVIPHIPOD STYGONECTES 95 



with 3 apical spines. Telson about 20 to 25 percent longer than 

 broad, not appreciably tapered distally; convex apex armed with about 

 12 untined and undeflected spines. 



Variation. — Out of a total of 14 females, two specimens had one 

 of the two 3rd uropods \\Tith three apical spines. The remaining 

 specimens possessed two apical spines on the third uropod. 



Type locality. — Gorman Cave, San Saba Co., Tex. The type 

 locality is situated about 16 miles south-southeast of San Saba on the 

 western side of the Colorado River. Type material was collected 

 from shallow pools containing organic debris and troglobitic asellid 

 isopods (J. Reddell, pers. comm.). Gormans Cave is essentially a 

 3,000 foot-long passage that opens into the Colorado River (Reddell, 

 1964a). It has been developed in Ordovician, Ellenberger limestone, 

 which crops out in the Llano Uplift area of central Texas. 



Distribution and ecology. — This species is distributed from 

 Kendall County northward to San Saba and Lampasas Counties and 

 eastward to Coryell County. A range disjunction of 75 miles occurs 

 between recorded localities in Kendall and San Saba Counties. Five 

 collections pertaining to S. bifurcatus have been made from cave pools, 

 most of which were stream fed and most of which contained organic 

 debris. In three caves (Gormans, Harrells, and Tippits) this species 

 was found to occur syntopically with S. russelli. Although a number 

 of females had well-developed brood plates, only two were ovigerous 

 and occurred as follows: 13.50 mm specimen wAth. eight eggs, August 

 collection from Harrells Cave; 11.50 mm specimen with five eggs. May 

 collection from Cave Without-A-Name. 



Remarks. — In a recent paper (Holsinger, 1966) I included all of 

 the above material under S. balconis, but as already mentioned, the 

 present study indicated S. bifurcatus to be a distinct species. Hu- 

 bricht's record of S*. balconis from Cave Without-A-Name (Hubricht, 

 1943) was also S. bifurcatus. Most of the variation attributed to 

 S. balconis in my earlier paper (Holsinger, 1966) regarding bifurcate 

 sternal gills, palmar margin concavity, and telson spines, was because 

 of failure to initially separate these two closely allied species. Dearolf 's 

 record for S. clantoni from Schneiders Cave (Dearolf, 1953) was based 

 on an erroneous determination. I have examined the same material 

 and found it conspecific with S. bifurcatus. 



Stygonectes russelli, new species 



Figures 23, 24 



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

 Stygonectes species. — Reddell, 1965, p. 160 (in part). — Holsinger, 1966, p. 119. 

 Stygonectes balconis Hubricht. — Holsinger, 1966, pp. 113-116 (in part). 



