770 rROCKKJUNGS OF THE XATlOXAL MVSKrM. v.il. xxx. 



much greater depth, a shorter aiiul, shorter maxillary barbels, and a 

 lig-ht, rather than a dark, lateral band. 



The type and one cotype were taken at Eten, Peru, in the llio Eten. 

 The type is 155 nun. in entire h^iuth and the eotype 110. The latter 

 is deposited in the U. S. National Museum, Cat. No. 5H^2; the eotype 

 in Stanford University JNIuscum. 



1 take pknisure in naming; this species for Dr. Tlieodore (Jill. 



13. CETOPSIS OCCIDENTALIS Steindachner. 



Four s])('ciiuens were taken at (Tuaya([uil, tln^ type locality oi" the 

 species. They arc from HI to 2() cm. in length. 



They ayree very well with Dr. Steindachner's descri])tion of the 

 t3'pe specimen exc(»pt that the teeth on the vomer are in a sino-lo row 

 anteriorly, and a double row posteriorly. In the type specimen they 

 are said to be in a double row antei'iorly and a triple row posteriorly. 



Family PYCJIDIID.E. 



14. PYGIDIUM DISPAR Tschudi. 



A single specimen IS cm. in length taken at Eten, Peru. 



Head contained 4| times in length without caiulal; its width less 

 than its length l)v nearh" 2 diameters of eye, and its depth at occi})ut 

 is half its length. Depth of body contained <> times in IcMigth. Body 

 slender, tapering but little to the wide, thin, caudal peduncle, the 

 depth of which is contained Ik times in body length. Eye eciuidistant 

 frt)m tip of snout and edge of opercle; its length ;U in post-or])ital 

 part of head, and 8 tinu\s in interocular space. AMdth of ])r(Mnaxillary 

 tooth patch one-sixth of its length; that of maiidil)h» a little nanower. 

 Lips, and a region a shoi't distance Ixdiind lower li]), slightly ])apillose. 

 U[)per maxillary barbel reaching just i)ast pr(H)})erch\ but scarcely to 

 gill opening. Nasal barbel of same length bnt much more slender. 

 Spines on lower edge of preopercle uncMpial in size; the longest ones 

 one-half diameter of eye. 



Dorsal with 12 rays, onl}' 7 or which are branched; the others not 

 evident until skin is dissected away in front of branched rays. Anal 

 with 1) ra3's, only .") ))ranched. Origin of dorsal behind middle of body 

 a distance eipial to length of dorsal basi^; its iirst ray just behind base 

 of ventrals, and its last ray a little in front of first anal ray. Distance 

 from base of last anal ray to base of median caudal rays (vpial to 

 length of head. Upper pectoral ray ])roduced in a tine lilament 

 slighth' l)eyon(l otluM- rays; its length (Mpial to length of head behind 

 posterior nasal opcMiing. Ventrals reaching a little more than half the 

 distance l)etw(M'n their ))ase and lii-st anal ray. C^audal ti'uncate when 

 tin is spi-i^ad. but when its rays are ])arall(d its posterior edge is slightly 

 concave. 



