87 FISHES OF SINALOA. 459 
Fins all golden yellow; body dark bronze, with rows 
of pearly blue spots; a large black blotch at base of 
caudal. 
133. Lythrulon flaviguttatum (Gill). (//@mulon mar- 
| garitiferum Ginther. ) 
This species is not very common in the estuary at Ma- 
zatlan, a few specimens having been taken by Dr. Gil- 
bert. It is widely distributed along the coast from Guay- 
mas to Panama. 
134. Lythrulon opalescens Jordan & Starks, n. sp. 
Plate oxi: 
Rather common in the estuary at Mazatlan, not yet no- 
ticed elsewhere; all the specimens of Lythru/on trom 
other localities examined by us being referable to Lythru- 
lon flaviguttatum. 
Head 3%; depth 2%; dorsal XII, 16; anal III, 9; snout 
3% in head; maxillary reaching slightly past front of 
pupil, 2% in head; orbit 2%; interorbital 3% ; longest dor- 
sal spine 2; longest dorsal ray 4; second anal spine 2% ; 
pectoral 1,;1,; ventrals 1%; scales 7-54-13. 
Body deep, compressed, the back well elevated, the 
dorsal outline nearly uniformly curved from tip of snout 
to caudal peduncle; ventral outline curved from chin to 
breast, thence straight to anal spine, and slanting obliquely 
upwards to caudal peduncle. 
Snout small and pointed; mouth small and oblique, the 
lower jaw slightly projecting; teeth all small, the outer 
scarcely enlarged; preopercle finely serrate, the posterior 
limb somewhat concave, the angle broadly rounded. | 
Gill-rakers short and slender, about half the diameter of 
pupil, 8+-15; scales above lateral line arranged in oblique 
series; tip of snout, chin and maxillary naked; scales on 
head small and crowded: soft fins scaled. 
