SI FISHES OF SINALOA. 453 
121. Centropomus pedimacula Poey. RosaLiro, 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 Blas (Nichols) 
and Punta Arenas (Gilbert). 
We find but one difference between the Pacific form 
called Centropomus medius and its Atlantic analogue, 
Centropomus pedimacula Poey. Inthe Pacific specimens, 
Centropomus medius, the second anal spine is curved and 
1% to 12 timesin head. In Centropomus pedimacula it 
is straightish and longer, 1% to 1% in head. This dif- 
ference is of very doubtful value, and for the present we 
place medius in the synonymy of fedimacula. 
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 enszferus 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. 
