452 CALIFORNIA ACADEMY OF SCIENCES. 



117. Prionodes fasciatus Jenyns. 



Generally common in rocky islands on the Coast. 

 Obtained by Gilbert ±rom the islands about Mazatlan, 

 whence it was described as Serraniis calo^teryx. Not 

 taken by us. 



Serraniis bulleri, lately described by Dr. Boulenger 

 from Las Pehas, Jalisco, seems to be identical with Pri- 

 onodes fasciatus. 



118. Rypticus xanti Gill. Jabon. 



This species was found by Gilbert in some abundance 

 at Mazatlan. It was not seen by us. 



Family CENTROPOMID^. 



119. Centropomus viridis Lockington. Robalo. 



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- 

 alis 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 viridis. Recorded from Chiapam by Giin- 

 ther, and from Mazatlan, Panama and Punta Arenas by 

 Gilbert. 



