452 CALIFORNIA ACADEMY OF SCIENCES. 8o 
117. Prionodes fasciatus Jenyns. 
Generally common in rocky islands on the Coast. 
Obtained by Gilbert trom the islands about Mazatlan, 
whence it was described as Serranus calopteryx. Not 
taken by us. 
Serranus bullert, lately described by Dr. Boulenger 
from Las Pejnas, Jalisco, seems to be identical with Prz- 
onodes fasciatus. 
118. Rypticus xanti Gill. JAxon. 
This species was found by Gilbert in some abundance 
at Mazatlan. It was not seen by us. 
Family CENTROPOMID/E. 
119. Centropomus viridis Lockington. Rosato. 
A common and valued food fish at Mazatlan, where it 
was also taken by Dr. Gilbert. 
This Pacific Coast fish seems to be really a species dis- 
tinct from Centropomus undecimalis, with which it has 
hitherto been identified. The only differences we find 
are these: In Centropomus viridis the anterior append- 
ages to the air-bladder are two to three times diameter of 
orbit (in C’. undecimalis not longer than orbit), and the 
third anal spine projects beyond second. In C. undecim- 
alts the second spine is the longer. 
Color in life olivaceous, the sides dull silvery, a very 
little yellow on ventral, none elsewhere; ventrals not 
black. 
120. Centropomus. nigrescens Giinther. RoBaLo 
PRIETO. 
Rather common; a food fish of some importance, 
reaching a length of about two feet, less common than 
Centropomus virid’s. Recorded from Chiapam by Giin- 
ther, and from Mazatlan, Panama and Punta Arenas by 
Gilbert. 
