474 '- CALIFORNIA ACADEMY OF SCIENCES. 



is in the greater uniformity in coloration of the adult, in 

 which the blue shades become obscure, and the ocelli, so 

 conspicuous in the young, are more or less lost. 



This species is exceedingly close to Eupomacentrus 

 ficsctts (Cuvier & Valenciennes), a species found on the 

 Brazilian coast. Comparing specimens from Bahia with 

 ours from Mazatlan, we note that in £. rectifrcBnum the 

 blue markings persist longer and that the scales on the 

 head are smaller, more crowded and more mixed with 

 small scales in E. j-ectifrcenuin than in Eupomacentrus 

 fuscits. 



Head 3>^ ; depth 2; D. XII, 13; A. II, 11; scales 

 3-28-9; eye 4 in head; snout 2|; D. lobe if; C. upper 

 lobe If; V. i ^^ ; P. i>^. 



Preorbital and preopercle strongly serrate. Teeth 

 firm, flattened, not notched. Lateral line ending under 

 ninth dorsal ray. Caudal lunate, the upper lobe the 

 longer. Dorsal and anal rounded, ventral filamentous. 

 Gill-rakers short, slender, weak, numerous. 



Color of adult (5)^ inches) nearly uniform blackish 

 olive, darker on head, back and fins, paler on pectoral 

 and on axil, where is a yellowish area below the small 

 axillary spot. 



The coloration of the young and partly grown has been 

 well described by Dr. Gill. Dr. Gill's last account 

 (Proc. Ac. Nat. Sci. Phila., 1863) of this and related 

 species is most excellent. The only error of importance 

 contained in it is the failure to examine the teeth of 

 ^'Poniataprion'" bairdii and dorsalis. Poviataprion is 

 identical with Microspathodon. 



172. Eupomacentrus flavilatus (Gill). Pescado Azul 

 DE DOS CoLORES. Plate xlii. 

 This httle fish is equally abundant with the preceding 

 in rock pools. It seems to reach a smaller size. The 



