8l FISHES OF SINALOA. 453 



121. Centropomus pedimacula Poey. Robalito, or 

 Constantino de las Aletas Prietas. (Centro- 

 pomus medius Giinther.) 



Rather common, reaching a length of a little more than 

 a foot; found at Chiapam (Giinther), San Bias (Nichols) 

 and Punta Arenas (Gilbert). 



We rind but one difference between the Pacific form 

 called Centropomus medius and its Atlantic analogue, 

 ( 'entropomus pedimacula Poey. In the Pacific specimens, 

 Centropomus medius, the second anal spine is curved and 

 \y 2 to i| times in head. In Centropomus -pedimacula it 

 is straightish and longer, i % to i% in head. This dif- 

 ference is of very doubtful value, and for the present we 

 place medius in the synonymy of pedimacula. 



Color greenish, the sides bright silvery. Ventral pale 

 yellow, black at tip, a little yellow on anal, none else- 

 where. Upper fins dusky; dusky on anal behind the 

 spine. 



122. Centropomus robalito Jordan & Gilbert. Constan- 

 tino, or Robalito de las Aletas Amarillas. 



Rather common in the estuary and freely ascending the 

 fresh waters, numerous specimens being taken by us in 

 various places in the Rio Presidio. The species was 

 found by Gilbert at Mazatlan and at Panama; it is prob- 

 ably generally common along the coast. 



At our request, Dr. Evermann has compared speci- 

 mens of the Pacific form called Centropomus robalito with 

 Centropomus ensiferus from Cuba. He is unable to find 

 any differences, and probably the two are identical. Cen- 

 tropomus armatus Gill from Panama is, however, distinct 

 from ensiferus or robalito. 



Olivaceous with bluish reflections ; sides silvery, bright- 

 est above; ventrals bright yellow, not black at tip. Anal 

 more or less bright yellow; upper fins dusky. 



