234 



MEMOIRS OF THE CARNEGIE MUSEUM 



Six specimens, 60-116 mm. Warraputa. (C. M. Cat. No. 1534a-6; I. U. 

 Cat. No. 11956.) 



Four specimens, 80-143 mm. Rockstone. (C. M. Cat, No. 1535a-6; I. U. Cat. 

 No. 11957.) 



Head 3; depth 5.66-6 to end of middle caudal plate; D. 1,7; A. 1,5. Twenty- 

 five scutes, counting the one on the caudal; four pairs and an azygous plate be- 

 tween the dorsals; eleven plates behind the anal. 



Width of head equal to its length or very little narrower; eye 5 in head, inter- 

 orbital not quite 4; mandibular ramus but little less than interorbital; opercle in 

 the male (C. M. Cat. No. 1533) with a bunch of graduate bristles, the longest 2.66 

 in the head, not completely retractile and not hooked; marginal bristle in the 

 same male three-fourths the length of eye. Bristles scarcely evident in female. 

 Head and plates without keels; belly entirely naked; dorsal spine equal to snout 

 and eye or half eye. Base of dorsal equal to its distance from the caudal, last ray 

 scarcely adnate. Caudal obliquely emarginate; ventrals reaching past origin of 

 anal ; pectorals past origin (to second third) of ventrals. 



All but the ventral surface brown or slaty, with clear white dots. 



The alimentary canal in a specimen 100 mm. long is 855 mm. in length. 



101. Pseudancistrus nigrescens sp. nov. (Plate XXV, fig. 2.) 

 Pseudancistrus nigrescens Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 

 1910, 409 (name only). 



Fig. 35. Pseudancistrus nigrescens Eigenmann. Type. C. M. Cat. No. 1539. 



Type, 182 mm. Amatuk. (Carnegie Museum Catalog of Fishes No. 1539.; 

 Cotype, 149 mm. Amatuk. (I. U. Cat. No. 11960). 



