S7 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). (Hcemulon mar- 

 garitiferum Giinther.) 



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 Guav- 

 mas to Panama. 



134. Lythrulon opalescens Jordan & Starks, n. sp. 

 Plate xl. 



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

 ticed elsewhere; all the specimens of Lythrulon from 

 other localities examined by us being referable to Lythru- 

 lon -flaviguttatum. 



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

 37^ in head; maxillary reaching slightly past front of 

 pupil, 2% in head; orbit 2-jj-; interorbital 2% '■> longest dor- 

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

 pectoral ij\; ventrals iy£ ; 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 obliquelv 

 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. 



