1916.] NATURAL SCIENCES OF PHILADELPHIA. 427 



Girardinichthys innominatus Bleeker. 



Act, Soc. Ind. Neerl. (Prodr. Ich. Arch, [nd.), I860, pp. Isl, 184 (on 

 (Jirard's description without a name. Proc. Acad. N Phila 



IS')!), p. US. City of Mexico.) 



No. 7,605, A. N. S. P., cotype. City of Mexico. Collection 

 Major W. Rich. Smithsonian Institution. 



Also seven examples from Lake Xochimilco in 1885 (E. D. Cope). 



ORESTIIN.E. 



Orestias cuvieri Valenciennes.- 



Tinta, Peru, and Lake Titicaca. 



Orestias pentlandii Valenciennes. 



Lake Titicaca. 



Orestias bairdii Cope. 



Journ. Acad. Nat. Sci. Phila., 1875, p. 185. Lake Titicaca. 



No. 21,554, A. N. S. P., type. Lake Titicaca, Bolivia. Prof. 

 James Orton. 1873. E. D. Cope. 



This species has been merged with the preceding by Carman, 

 though it appears to differ in the larger pectoral reaching half way 

 to the vent, besides the much larger predorsal scales. 



Orestias agassizii Valenciennes. 



O. ortonii Cope, 1. c, p. 186. Lake Titicaca. 

 O. frontosus Cope, 1. c. Lake Titicaca. 



No. 21,557, A. N. S. P., type of 0. ortonii Cope. 



Nos. 21,555 and 21,556, A. N. S. P., cotypes of 0. frontosus Cope. 



Also several other examples from Peru and Lake Titicaca. 

 Orestias cypho sp. nov. Fig. 3. 



Head 2f; depth 2f; D. i, 13; A. i, 13; P. I, 18; scales 35 in 

 median lateral series to caudal base and 5 more on latter; 14 scales 

 transversely between dorsal and anal origins; about 23? predorsal 

 -calcs; head width nearly equals its length; head depth at occiput 

 If; lower jaw 3|; fifth branched dorsal ray 2f; fifth branched anal 

 ray 2\\ least depth of caudal peduncle 2; caudal If; pectoral 1 | 

 snout 5^ in head measured from upper jaw tip; eye 5^: maxillary 

 3^; interorbital 3|. 



Body very robust, especially anteriorly, compressed behind, 

 - atesl depth about opposite middle of pectoral. Predorsal with 



vated rather stout and moderately convex median keel beginning 

 at occiput. Caudal peduncle well compressed, length about \ its 

 least depth. 



ffead very wide, robust, large, opercular regions swollen out 

 29 



