115 FISHES OF SINALOA. 487 
but much smaller, scattered over posterior half of body; 
most numerous about the other spines. Gill-rakers ex- 
tremely small and weak. Caudal evenly lunate. Pecto- 
ral not falcate; anterior profile concave before eye then 
convex, the short conic snout projecting; lower jaw in- 
cluded. Preopercle obliquely placed, its bony edge 
slightly roughened. 
Color in life olive green, slightly paler below, every- 
where evenly covered with small round black spots, close- 
set and not confluent, the largest about equal to nostril. 
Caudal peduncle and fin abruptly bright yellow, unspotted. 
Other fins colored like the body and similarly spotted, the 
spots more sparse, the edges dusky with few spots. Large 
caudal spines whitish, their bases black; other spines all 
black. 
Among the young two different styles of coloration 
were noticed, but all probably belong to the same spe- 
cies: 
I. Specimens with the caudal yellow are more dusky, 
the dark spots much smaller and more distinct than in 
the others. Ground color of back light steel blue gray, 
lighter below head. Caudal canary yellow, clouded with 
dark at base, the yellow running forward on caudal pe- 
duncle. 
2. Specimens with the caudal white have ground color 
lighter, more milky in general, much more silvery below 
eye, the silvery forming an irregular triangular patch on 
breast and opercle; caudal gray and white, black at base, 
white running forward slightly on caudal peduncle; dark 
spots on body forming pale reticulations, above lateral 
line white patches. Body deeper than in yellow-tailed 
specimens. 
Both have the first dorsal and anal black at base, other- 
wise mostly white: white line bounding the back: dark 
