1906.1 



NATURAL SCIENCES OF PHILADELPHIA. 



313 



2. Width of head greatest in postero-supraocular region. Gill-fila- 

 ments about f of orbit, Predorsal region apparently keeled. Pre- 

 ventral region apparently rounded, and postventral region keeled. 

 Color in alcohol more or less pale plmnbeous and somewhat silvered. 

 Back darker or dusky-plumbeous. Upper surface of head like back, 



Fig. 13. — Prochilodus cephalotes Cope. 



and lower surface like that of belly. Damaged dorsal with at least 4 

 series of deep brownish spots on rays. Caudal also with transverse 

 series of spots, other fins plain. Iris brassy. Length 2f inches. 

 Otherwise like the preceding. 



Frochilodas theraponura sp. nov. Fig. 14. 



Prochilodus insignis Cope, Proc. Acad. Nat. Sci. Phila., 1871 (January 16, 

 1872), p. 258. Ambyiacu River, Equador. John Hauxwell. 



Head 2|; depth 2i; D. iii, 9; A. iii, 8, i; P. ii, 11?; V. ii, 8; scales 

 about 40? (squamation damaged), and 5? more evidently on base of 

 caudal; about 10? scales obliquely back from origin of dorsal to lateral 

 line; about 8? scales obliquely forward from origin of anal to lateral 

 line; 14 scales before dorsal; width of head about 2 in its length; 

 depth of head 1^; snout 3^; eye 3; width of mouth 3; interorbital space 

 2^; length of fu-st branched dorsal ray 1^; base of dorsal 2^; base of 

 anal 2^; length of upper caudal lobe 1; pectoral If; ventral If; least 

 depth of caudal peduncle 3^. 



