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), (Hceiniilon mar- 

 ga rit ifer iim G ii n th e r , ) 



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 xl. 



Rather common in the estuary at Mazatlan, not yet no- 

 ticed elsewhere ; all the specimens of Lythrulon from 

 other localities examined by us being referable to Lythru- 

 lon Jiavigiittatum. 



Head 3^; depth 2^ ; dorsal XII, 16; anal III, 9; snout 

 3^ in head; maxillary reaching slightly past front of 

 pupil, 2}4 in head; orbit 2|; interorbital 3^ ; longest dor- 

 sal spine 2; longest dorsal ray 4; second anal spine 2}4 ; 

 pectoral i-j^^-; ventrals i}4 ; 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. 



