(.52 CALIFORNIA ACADEMY OF SCIENCES. 80 



117. Prionodes fasciatus Jenyns. 



Generally common in rocky islands on the Coast. 

 Obtained by Gilbert irom the islands about Mazatlan, 

 whence it was described as Serranus caloftteryx. Not 

 taken by us. 



Serranus bulleri, lately described by Dr. Boulenger 

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

 on odes fascia/ as . 



118. Rypticus xanti Gill. Jabon. 



This species was found by Gilbert in some abundance 

 at Mazatlan. It was not seen by us. 



Family CENTROPOMID^E. 



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 Ceniropomas 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 

 ( 'entropomus viridis. Recorded from Chiapam by Giin- 

 ther. and from Mazatlan. Panama and Punta Arenas by 

 Gilbert. 



