FISHES FROM ECVADOR AND PERU—STARKS. 771 



I 



» 



Body covorod with lavoe, nearly round, dark-brown spots, as large, 

 or usually nuu-li laro-er, than lonj^ diameter of eye. On head and 

 caudal tin the}" nvv suuiller; on ventral surface just behind oill open- 

 iiio" they arc nearly fadi^d out, ])ut still evident. Anteriorly they are 

 more crowded than toward the tail. Frequently two or more of them 

 run together and form oblong s[)ots. 



15. PYGIDIUM PUNCTULATUM Cuvier and Valenciennes. 



Five specimens were collected at Callao. J\ jnoKialatuiii appears 

 to ditt'er from J*. dlsjKir in little but color. It is thickly covered with 

 small, dark-brown spots not over half as large as in the latter species 

 and a})out twice as numerous. 



All of our specimens have one mor(> branched ray in the dorsal, and 

 the caudal peduncle scarcely so deej) or compressed. 



16. PYGIDIUM RIVULATUM Cuvier and Valenciennes. 



A few half -grown specimens taken at Lake Titicaca agree very well 

 with the description published by Eigenmann." 



The dorsal ra3^s number 12, of which only 7 are branched and evi- 

 dent without dissecting. The anal has 11 rays, (5 or 7 of which ai-e 

 branched. The dark markings on the bod}^ have a decided purplish 

 cast. 



Family ARGID^E. 



17. ARGES SIMONSII Regan. 



There are four specimens of this species taken in the Peruvian Andes 

 at an altitude of 7,200 feet. The label is so disintegrated that the 

 exact locality can not be deciphered. The type locality (Iluaras, Peru) 

 is 10,700 feet in altitude. 



These specimens agree very well with the original description of 

 the species. The teeth are incisor-like and with entire edges in the 

 front of l)oth jaws. There are 5 or teeth in the outer series on each 

 side of the premaxillary and 1 or 5 on each side of the mandible. 

 One specimen, a male, 75 mm. in length, is much deeper than the 

 othei-s, agreeing very well in this, as in other respects, with Regan's 

 plate. The depth is 5^ in the length. The others, a male of about 

 the same length and 2 females 90 mm. in length, have a depth of from 

 6| to 7 in the length. There is no other essential difference between 

 them. No spine was found in the adipose dorsal, though the skin was 

 dissected away in this region in tw^o specimens. There is no difference 

 in the position of the ventrals between the sexes such as Evermaim 

 and Kendall report in Cyclophdn vyclopxiwJ' 



«Cal. Acad, of Sci., Occasional i)aiwrf>, T, 1890, p. 832. 

 '^ProcBiol. Sue. Waah., XVIJl, p. i)l. 



