SUBTERRANEAN AMPHIPOD STYGONECTES 115 



Palmar margins of gnathopodal propods with larger spine teeth; dactyls of 

 pereopods 5-7 about 1/4 as long as corresponding propods; 3rd uropod 

 with 5 apical spines; spring in Comal Co., Tex. . . . S. peek!, new species 



FLAGELLATUS Subgroup 



Diagnosis. — Antenna 1 elongate, 75 to 100 percent as long as body. 

 Pereopod 5-7, segments rather slender. Pereopods 6 and 7 varying 

 from 60 to 70 percent as long as body. Telson with lateral spines. 



Stygonectes flagellatus (Benedict) 



Crangonyx flagellatus Benedict, 1896, pp. 616-617 [Type locality: artesian well at 

 San Marcos, Hays Co., Tex.].— Stebbing, 1906, pp. 371-372.— Banta, 1907, 

 p. 80. 



Crangonyx bowersii Ulrich, 1902, pp. 85-88, pi. 14 [Type locality: artesian well 

 at San Marcos, Hays Co., Tex.]. — Banta, 1907, p. 80. — Eigenmann, 1900, 

 pp. 301-302 (nomen nudum). 



Shjgonectes flagellatus (Benedict).— Hay, 1903, p. 430.— Weckel, 1907, pp. 51-53, 

 fig. 14.— Holmes, 1909, p. 79.— Uhlenhuth, 1921, p. 98 (in part?).— Mackin, 

 1935, p. 47.— Schellenberg, 1936, p. 38.— Shoemaker, 1938, p. 140.— Hubricht, 

 1943, p. 705 (in part).— Dearolf, 1953, p. 228.— Barnard, 1958, p. 74.— 

 Hubricht, 1959, p. 878.— Nicholas, 1960, p. 129.— Reddell, 1965, p. 160.— 

 Holsinger, 1966, pp. 103-107, figs. 1-22. 



Eiicrangonyx flagellatus (Benedict). — Spandl, 1926, p. 76. — Chappuis, 1927. 

 p. 77.— Mohr, 1948, p. 17. 



Material examined 



TEXAS. — Hays Co.: artesian well in San Marcos, 4 female syntypes, 3 male and 

 4 female paVatypes, U.S. Fish Comm., April 8, 1896 (USNM 19328); 1 male 

 topotype, L. Hubricht, May 14, 1940 (LH) ; Ezells Cave, 1 female, K. Dearolf, 

 June 21, 1938 (USNM). 



Diagnosis. — Distinguished from other species of the flagellatus 

 group by the oblique and convex palmar margins of the 1st gnatho- 

 podal propod, more spine teeth on palmar margins of both gnathopodal 

 propods, subtriangular shaped bases of pereopods 5-7 (especially 5) 

 which are distinctly broader proximally than distally, and by larger 

 size. Largest male, 12.00 mm; largest females, 14.00 mm. 



Corresponding to the recent redescription by Holsinger (1966) with 

 addition of the following : 



Antenna 1 between 85 and 90 percent as long as body, about 50 

 percent longer than antenna 2. Pereopods 6 and 7 about equal in 

 length, 60 to 65 percent as long as body in males and 60 to 70 percent as 

 long as body in females. Abdominal side plates: posterior margins 

 moderately convex near corners, gently rounded in plates 1 and 2, 

 broadly rounded in plate 3 : posterior corners more distinct on plates 

 1 and 2 than on plate 3. 



