474 CALIFORNIA ACADEMY OF SCIENCES. 102 
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 Awpomacentrus 
fuscus (Cuvier & Valenciennes), a species found on the 
Brazilian coast. Comparing specimens from Bahia with 
ours from Mazatlan, we note that in /. rectzfrenum the 
blue markings persist longer and that the scales on the 
head are smaller, more crowded and more mixed with 
small scales in /. rect¢frenum than in Eupomacentrus 
fuscus. 
Head.92 45 “depth! 22 (Da Wxnl, t2 36° 1A beri isealcs 
3-28-9; eye 4 in head; snout 23; D. lobe 12; C. upper 
loberr2 ss Vornas Pw tdes 
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 *eelated 
species is most excellent. The only error of importance 
contained in it is the failure to examine the teeth of 
‘*Pomataprion’’ bairdi and dorsalis. Pomataprion is 
identical with A/7crospathodon. 
172. Eupomacentrus flavilatus (Gill). PrEscApo AzuL 
DE Dos CoLorEs. Plate xlii. 
This little fish is equally abundant with the preceding 
in rock pools. It seems to reach a smaller size. The 
