103 FISHES OF SINALOA. 475 
differences between the two are comparatively slight but 
very persistent, and we believe that the two species are 
fully distinct from each other. In life Aupomacentrus 
flavilatus is the most beautiful fish found on the coast of 
Mexico, showing a most intense shade in the blue of its 
back and the orange of its sides. Both this species and 
the preceding were found at Cape San Lucas, but only 
Evupomacentrus rectifrenum has been taken at Panama. 
An irregular line from snout below eye to soft dorsal 
divides the fish into two parts; below this line all is bril- 
liant yellow with an orange shade, deepest on anal; above 
allis the brightest sky blue. Scales darker, but all edged 
with sky blue, six sky blue stripes on upper part of head. 
An indigo spot on base of first soft dorsal and _ last dorsal 
spines extending on back, this surrounded by a ring of 
sky blue; a similar smaller ocellated spot on back of 
caudal peduncle. 
173. Abudefduf* saxatilis (Linnzus). 
Common in rock pools about Mazatlan, where it was 
obtained in abundance by Dr. Gilbert and by us. The 
largest specimens were taken by dynamite off the Vena- 
dos Islands. 
Careful comparison of these specimens with others 
from the West Indies shows no difference whatever. 
Glyphisodon troscheli Gill, the name given to the Pacific 
Coast form, is therefore fully synonymus with A dbudefduf 
(or Glyphisodon) saxatilts. 
In life, bright greenish yellow above with steel blue 
bands. Dorsal like back; other fins dusky; axillary spot 
faint. 
In alcohol, the color is a slaty brown tinged with red- 

* Abudefduf Forskal seems to be identical with Glyphisodon and is en- 
titled to priority, notwithstanding its barbarous form. 
