NO. 1468. FISHES FROM ECUADOR AND PERV—STARKS. 769 



12. RHAMDIA GILLI, new species. 

 Plate LXV, fig. 1. 



Head, 4 to 4^ in length without caudal; depth, 4i to 4f. Eye, 5 in 

 head; interorbital space, 3; bony part of interorbital space, 3f ; width 

 between angles of mouth, 3; width of head, 1^; dorsal spine. If; longest 

 dorsal ray, li; pectoral spine, If; longest pectoral ray. If; longest 

 ventral ray. If; base of dorsal. If; base of anal, 2; length of upper 

 caudal lobe, 1; length of median caudal ra3^s, 2; depth of caudal 

 peduncle, 2. Dorsal, I, (>; anal, 11; ventral, 6. 



Occipital process long and narrow, failing to reach the dorsal buckler 

 by a space equal to half a diameter of pupil. Fontanel extending 

 behind eye a distance equal to 1^ times diameter of eye. Its posterior 

 portion separated from its anterior by a narrow bridge of bone oppo- 

 site the posterior margin of eye. Snout rather narrow, and projecting 

 sligbtl}^ beyond tip of mandible; equal in length to postorbital part of 

 head. Eye at middle of length of head and having a free border. 

 Width of premaxillary band of teeth one-fourth its length; the band 

 is not interrupted at its middle. Maxillary barbel reaching just past 

 base of ventrals; mental barbel to base of pectoral tin; and postmental 

 barbel to middle of pectoral spine. 



Distance from tip of snout to insertion of dorsal contained 2f times 

 in length to base of caudal. Dorsal spine ending in a short ray-like 

 filament that does not, reach to tips of soft rays. When dorsal is 

 reclined, the tips of its rays just fail to reach the front of adipose dor- 

 sal. The adipose dorsal is a very thin, high, fold of skin on a raised 

 pedicle; its length contained 3i times in the body length, and its 

 height from the pedicle is one-fourth of length of head. The poste- 

 rior end of its base is a little behind the tips of the anal rays, and it 

 projects backward in a rounded lobe considerably beyond its base. 

 The pectoral rays extend beyond the pectoral spine to below the base 

 of the first dorsal ray. The ventrals extend two-thirds of the distance 

 from their base to front of anal. Anal fin rounded behind, the dis- 

 tance from its base to base of median caudal rays is equal to length of 

 head less half the diameter of eye. Upper lobe of caudal sharp and 

 longer than the lower rounded lobe by a diameter of eye. Vent oppo- 

 site middle of length of ventral rays. 



Color dark brown with a ditiused, rather wide, light band following 

 lateral line; a large dark spot on opercle; fins all dusky; a dark line 

 on membrane before each dorsal ray; adipose dorsal darker toward 

 outer edges; anterior edge of maxillary barbel white, contrasting 

 strongly with dark posterior edge; other barbels colorless. ^ 



This species seems to be more closely related to Rhamdla jenynsii 

 ((Tiinthef) than to any other. It diflers in having a larger head, a 

 Proc. N. M. vol. XXX— 06 49 



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