288 PROCEEiDINGS OF THE NATIONAL MUSiE-UM vol.94 



16. No fleshy keel at posterior edge of supraoccipital plate; if dark color bars 

 present on dorsal fin, color occurring on rays, not as round dark spots ou 

 membranes between rays; dorsal surface of head and of body without 

 dark spots. 

 3a. Anal rays I, 4; dorsal I. 8; about 4 or 5 hooked spines on interopercle. 

 4a. A dark spot on membrane between dorsal and first soft ray; upper 

 surface of head with some pale areas; pectoral fin with 2 or 3 cross 

 bars; eye 5 to 7 times in head. 



Chaetostoma guairensis ^^ Steindachner 

 46. Eye diameter 10 times in head; no black spots anywhere along base of 



dorsal fin Chaetostoma stanni Ltitken 



36 Anal rays usually I, 3 or I, 4, rarely I, 5; dorsal rays I, 7 to I, 9; about 5 to 

 10 spines on the interopercle, these spines nearly straight, except a little 

 hooked in pearsei. 

 5a. Dorsal rays I, 8 or I, 9; anal I, 4 occasionally T, 3. 



6a. A distinct black spot on membrane between dorsal spine and first soft 

 ray, but no such spots near base of following soft rays. 

 7a. Usually 3 (2 to 4) dark bars across upper rays of caudal fin; eye 

 contained in interorbital space 2.3 to 3.0 times; Rio Motatdu 

 system, Maracaibo Basin. 



Chaetostoma anomala sovichthys, new subspecies 

 76. Usually 4 (3 to 5) dark bars across upper rays of caudal fin; eye 2.6 

 to 3.2 in interorbital space. 



Chaetostoma anomala anomala Regan 



66. No black spots at bases of dorsal rays; dorsal fin rays I, 9, anal I, 4; 



upper parts with faint light spots. _ Chaetostoma pearsei Eigenmann 



56. Dorsal I, 7, anal I, 4; a black spot on membrane between dorsal spine 



and next ray and on membrane near base of each following ray. 



Chaetostoma nudirostris Ltitken 



CHAETOSTOMA TACHIRAENSIS. new species 



corroncho 

 Plate 7, B, C 



Holotype. — ^U.S.N.M. No. 121052, a specimen 58.6 mm. in standard 

 length collected by Leonard P. Schultz in the Rio Tachha 7 km. north 

 of San Antonio, Estado de Tachira, Venezuela, on April 1, 1942. 

 The Rio Tachira is a tributary of the Rio Zulia, Catatumbo system, 

 Maracaibo Basin. 



Para^?/p0.— U.S.N. M. No. 101612, a specimen 87.0 mm. in standard 

 length collected by Niceforo Maria in the Rio Pamplonita, near 

 Cucuta, Colombia, Catatimibo system, Maracaibo Basin. 



Description. — Based on the holotype and paratype; all measure- 

 ments are given in hundredths of the standard length, those for the 

 paratype in parentheses. Standard length (in mm.) 58.6 (87.0) ; total 

 length 83.0 (—) mm. 



M Although I have not seen material of this species, I am inclined to believe that it was based on an im- 

 mature specimen and may be the same as milesi or my tachiraensis. 



