470 * Mr. C. T. Regan on the Fishes of 



33. CJuetostomus palmeri ', Regan. 

 R. Tamana (Palmer). 



34. Chatostomus Upturns, Regan. 

 31. Taraana (Palmer) ; R. Condoto (Spurrell). 



35. Cha>tostomus paucispinis, Regan. 

 R. San Juan (Palmer). 



36. Chcetostomus margin atus i Regan. 

 R. Condoto (Spurrell). 



37. Ancistrus centrolepis, sp. n. 



Depth of body 5 in the length, length of head 2f . Breadth 

 of head 3^ in its length, depth 2, length of snout 2, diameter 

 of eye 7 to 8, interorbital width 2. Length of mandibular 

 ramus 3^ to 3^ in interorbital width. Snout with tentacles, 

 its upper surface nearly covered with bony plates, leaving 

 only a narrow naked margin ( ? ). fnteroperculum with 30 

 or 32 spines; longest nearly § length of head. 24 scutes in 

 a longitudinal series ; lateral scutes with the middle 2 or 3 

 series of spinules enlarged, ending in quite strong spines at 

 the posterior edge of each scute. Dorsal I 7 ; base as long 

 as its distance from tip of spine of adipose fin ; first ray | or 

 | length of head, last reaching adipose fin when laid back. 

 Anal 3 4. Pectoral spine reaching anterior ^ or middle of 

 pelvics. Caudal obliquely truncate. Caudal peduncle 2| to 

 2^ as long as deep. Uniformly blackish. 



Two specimens ( ? ), 350 and 395 mm. in total length, the 

 larger from Choco, R. San Juan (Palmer). 



This species is near A. hoplogenys, differing in the structure 

 of the scutes and the narrower naked margin of the snout. 



38. Loricaria magdalence, Steind. 

 R. San Juan (Palmer) ; R. Condoto (Spurrell). 



39. Sturisoma tamanee, Regan. 

 R. Tamana (Palmer) ; R. Condoto (Spurrell). 



40. Sturisoma panamensis, Eigenm. 

 31. San Juan (Palmer) ; 31. Condoto (Spurrell). 



