92 U.S. NATIONAL MUSEUM BULLETIN 2 59 



My studies of the syntypes of S. balconis have failed to reveal the 

 prominent peduncular spine on the female third uropod figured by 

 Hubricht (1943, pi. 8, fig. k). The two syntype females deposited by 

 Hubricht in the U.S. National Museum each had two apical spines on 

 the ramus of this appendage but did not possess the peduncular spine. 

 Hubricht (1943) also indicated that females of this species attained 

 the length of 12.50 mm, but the larger of the two syntype females in 

 the National Museum was only 9.75 mm long. 



Stygonectes bifurcatuSf new species 



Figure 22 



Stygonectes balconis Hubricht, 1943, pp. 706, 707 (in part). — Nicholas, 1960, 

 p. 129 (in part). — Reddell, 1965, p. 160 (in part).— Holsinger, 1966, pp. 

 113-116 (in part). 



Synpleonia clantoni Greaser. — Dearolf, 1953, p. 228 (in part). 



Material examined 



Texas. — San Saba Co.: Gorman Gave, male holotype, female allotype, 2 male 

 paratypes, J. Reddell and D. McKenzie, Mar. 15, 1963 (USNM). Additional 

 paratypes as follows (all from Texas) : San Saba Go. : Harrells Gave, G. Kunath 

 and J. Reddell, Aug. 31, 1963 (JRH) ; Goryell Go.: Tippits Gave, J. Reddell and 

 D. McKenzie, Mar. 9, 1963 (JRH); Lampasas Go.: Sullivan Knob Gave, 

 W. Russell, March 1963 (JRH). Other material (Texas) : Kendall Go.: GaveWith- 

 out-A-Name (Gentury Gaverns), L. Hubricht, May 15, 1940 (LH) ; Schneiders 

 Cave, K. Dearolf, June 17, 1938 (USNM). 



Diagnosis. — Relatively large troglobitic species bearing close 

 resemblance to S. balconis but differing from that species in four 

 important details as follows: Antenna 1 significantly shorter, only up 

 to 50 percent as long as body; propod palmar margins of gnathopods 

 slightly concave; lateral sternal gills bifurcate and 7th pereopod coxal 

 giUs present; telson with a few more apical spines in female. Largest 

 males, 14.25 mm; largest females, 14.25 mm. 



Male. — Antenna 1 nearly 50 percent as long as body, 45 percent 

 longer than antenna 2; primary flagellum with up to 27 segments; 

 accessory flagellum about as long as 1st 2 primary flagellar segments. 

 Antenna 2 with up to 13 segments in flagellum. Mandibular palpal 

 segment 3 with 8 or 9 long setae, segment 2 with 10 to 12 setae. 

 Maxilla 1, inner plate with 6 or 7 apical, plumose setae. Maxilla 2, 

 inner plate with 6 to 8 long, obliquely placed, plumose setae. Maxilli- 

 ped; outer plate not reaching to apex of 1st palpal segment; inner plate 

 with 4 or 5 thick, apical spines. Lower lip, inner lobes well defined 

 but only moderately broad. 



Gnathopod 1 : propod palmar margin slightly concave, armed with 

 a double row of about 10 spine teeth; posterior angle with 1 large 

 spine, 3 smaller spines and several setae on outside, 4 spines on inside; 



