472 CALIFORNIA ACADEMY OF SCIENCES. IO0O 
The specimens recorded by Eigenmann from San Diego 
Bay as Gerres cinereus var. (Amer. Nat., 1891, 156) 
seem to be Hucznostomus californiensis. 
166. Xystema cinereum (Walbaum). Mojarra BLANCA. 
Very abundant at Mazatlan, being one of the staple 
food fishes, and reaching a length of nearly two feet; its 
flesh is of an excellent quality. The species was found 
by Dr. Gilbert at Mazatlan and Panama, and seems to be 
generally common along the coast. Like the rest of the 
genus, it occurs in shallow water on sandy bottoms, away 
from the surf. 
167. Gerres peruvianus Cuvier & Valenciennes. Mo- 
JARRA DE LAS ALETAS AMARILLAS. 
This small species is abundant at Mazatlan, although 
less common than Lucinostomus californiensis, and A‘ys- 
tema cinereum. It rarely exceeds six inches in length. 
Gerres brevirostris Sauvage, from Rio Guayas, near 
Guayaquil, is not evidently different from this species. 
168. Gerres lineatus (Humboldt). Mojyarra CuInNa. 
( Gerres axillaris Ginther ). 
Rather common at Mazatlan, with the preceding, but 
reaching a rather larger size, from eight to twelve inches, 
and frequently used as food. It was found by Dr. Gilbert 
at Mazatlan, and has been recorded from Acapulco by 
Humboldt and Bradley, from San Blas by Nichols, and 
from Chiapam by Giinther. 
Family CIRRHITID. 
169. Cirrhites betaurus Gill. 
The young of this species, from two to six inches in 
length, are very abundant in rock pools about Mazatlan, 
where numerous specimens were obtained by us, as well 
