EIGENMANN: the freshwater fishes of BRITISH GUIANA 



161 



Cotype, one specimen, 89 mm. Waratuk. (C. M. Cat. No. 16o8a.) 



Cotypes, two specimens, 67 and 68 mm. Konawaruk. (C. M. Cat. No. 

 1659a; I. U. Cat. No. 12046.) 



Cotypes, twelve specimens, 38-83 mm. Warraputa. (C. ^i. Cat. No. 1660 

 a-c; I. U. Cat. No. 12046.) 



One specimen, 60 mm. Warraputa. (C. M. Cat. No. 1661a.) This may 

 prove to be distinct. 



Very similar to Leptoglanis. 



Fig. 33. Chasmocranus longior EiKenmann. Tifpe. C. M. Cat. No. 1655. 



Head 4.5-5; depth 9-10; D. 7; A. usually 11 or 12, rarely 10; width of head 

 less than its length, its depth 2 or 3 in its length; eye 6-7 in head, 2-2.66 in snout, 

 1-1.33 in distance between the eyes. 



Head depressed, tail compressed; tip of occijiital crest about equidistant from 

 snout and dorsal; anterior nostril nearer the snout than to posterior nostril; lips 

 thin, plicate; mouth terminal, its angle about midway between anterior and pos- 

 terior nostrils; depth of premaxillary patch of teeth about 1.5 in the length of its 

 outer margin; maxillary barbel extending to or a little beyond origin of pectoral; 

 outer and inner mental barbels in a straight line, their distance from the edge of 

 the lower lip equal to the distance between the inner barbels. 



Distance of dorsal from tip of snout 2.5-2.66 in the length, the rays from the 

 second to the sixth of about equal height; ventrals and dorsal equidistant from 

 tip of snout; pectorals rounded, equal to head less snout in length; origin of anal 

 under origin of adipose, its base long, last but fourth ray highest or of equal height 

 with those immediately in front of it; caudal slightlj^ forked, the lobes rounded, of 

 nearly equal length, considerably less than length of head. 



Dark brown to black; sometimes a light streak across back from gill-opening 

 to gill-opening; a light spot at base of first dorsal ray; fins light brown or blackish 

 with white margins. 



