476 CALIFORNIA ACADEMY OF SCIENCES. 104 
dish brown below, showing faint dark cross bars, with no 
bright color anywhere, the yellowish green of the back 
being last to fade; behind the pectoral each scale has a 
white spot, these form white lines that run back to a little 
past the tip of pectoral. All fins dark except pectoral, 
which is colorless. 
174. Abudefduf declivifrons (Gill). 
This species occurs in rock pools in abundance every- 
where about Maxatlan, in company with Adudefduf saxa- 
felis, from which its duller color readily distinguishes it. 
In life, dusky brownish with many pale spots on edge 
of scales; these vary a good deal; cross bands blackish; 
no bright colors. Black spot at base of pectoral con- 
spicuous, a good mark, varying in size, larger in older 
specimens. 
175. Microspathodon bairdii (Gill). Plate xliii. 
Numerous small specimens taken in the rock pools in 
company with Hupomacentrus flavilatus, a species which 
the present one closely resembles in color, and which 
scarcely excels it in brilliancy. This species has been well 
described by Dr. Gill. It seems to reach only a small 
size, none of ours being more than two inches long. 
It differs from the other species of JZ¢crospathodon in 
its low fins and in color. The latter may be a matter of 
age only, but this does not seem likely, as the young of 
Microspathodon dorsalis (called by Dr. Gill guadrigutta) 
has essentially the coloration of the adult. Apparently 
four species of A/zcrospathodon exist on the west coast of 
Mexico, but it is possible that all are forms of one protean 
species, for which the earliest specific name is dorsalis. 
Head 3; ‘depth 2; dorsal 21); 16;> anal’ Tl, 135 ever, 
in head; pectoral 1%; anal % longer than head; soft 
dorsal and anal lobes equal 1% in head; caudal lobe 1% 
in head. 
