1906.] NATURAL SCIENCES OF PHILADELPHIA. 305 



If; upper caudal lobe about 1. Rakers distinct. First branched ray 

 of dorsal longest, and reaching well beyond others, when fin is depressed, 

 or to origin of adipose fin. Adipose fin long, its length along posterior 

 margin but little less than length of its base. Anterior anal rays 

 elevated. Caudal long, deeply forked, and each lobe well pointed. 

 Pectoral long, pointed, and reaching origin of ventral. Ventral long 

 and pointed, and reaching origin of anal. 



Semitapicis laticeps (Valenciennes). 



Curimatus altamazonicus Cope, Proc. Amer. Philos. Soc. Phila., XVII, 

 1877-78 (May 17, 1878), p. 684. Xos. 21,118 (tj-pe) to 21,120, A. N. S. 

 P., cotypes. Peru\dan Amazon. Prof. J. Orton. Coll. of 1873. 



Head 3i; depth 2f ; D. ii, 9, i; A. in, 12, i; P. i, 16; V. ii, 8; scales 

 about 88 in lateral line to base of caudal (squamation injiu-ed), and 6 

 more on latter; width of head 2^ in its length; depth of head If ; snout 

 3f; width of mouth 3f ; interorbital space 2^; base of dorsal 2^ ; base 

 of anal 2 ; least depth of caudal peduncle 3 ; pectoral (damaged) 2 ; 

 ventral (damaged) 1*. No gill-rakers, and filaments H in eye. Color 

 in alcohol brown, paler on lower surface or below lateral line. Head 

 dark on top, like back, and sides and under portions pale. Fins all 

 brownish. Eye dusky. Length (caudal damaged) 7f inches. Type. 



The other cotypes show: Head 3 and 3,^; depth 2f; D. ii, 10, i; 

 A. II, 13, i; total length of body 6i and 7^ inches respectively (caudals 

 damaged). 



Psectrogaster ciliatus (MuUer and Troschel). 



Curimatus rutiloides Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 258. 



Amb\aacu River, Equador. John Hauxwell. (Xot of Kner.) 



Curimatus cyprinoides Cope, I.e., p. 291. Between the mouth of the Rio 



Negro and the Peruvian Amazon or Ucaj^ale River. Robert Perkins. 



(Not of Linna?us.) 



Head 3; depth 2J; D. iii, 9, i; A. iii, 7, i; scales 48 in lateral fine to 



l)ase of caudal, and 5 more on latter; 12 scales in an oblique series 



back from origin of dorsal to lateral line; 9 series of scales obliquely 



back from origin of ventral to lateral line; 9 series of scales obliquely 



forward from origin of ventral to lateral line; about 32 scales before 



dorsal; snout 3f in head; eye 3^; width of mouth 3f ; interorbital space 



2^ ; pectoral If ; ventral If ; least depth of caudal peduncle 2|. Rakers 



none. Gill-filaments about' f of orbit. Postventral carina well 



developed, scales strongly pectinate which form it. Scales on body 



all more or less ctenoid. Upper and lower profiles of body more or 



less evenly convex. Scales on trunk enlarged anteriorly on middle of 



side, so that longitudinal series are formed which are more or less 



parallel with course of lateral line above, and below converging as they 



