1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 139 



rals are longer than bead by one-four tb tbe length of tbe head, reach- 

 ing to tbe middle of veutrals. Ventrals about reaching vent, 1.9 in 

 head; scales firm, large; pores developed on scales on various parts 

 of the body; 4 rows on tbe cheeks. Peritoneum black. 



Tbis species is allied to A. affinis Avers, from which it differs in the 

 longer pectorals, larger scales, and in the position of the spinous dor- 

 sal, which in this species is mucb nearer tbe bead. 



Tbis species is common in tbe bay at Guaymas, where rnany specimens 

 were obtained. 



Measurements. 



4. Centropomns grandoculatus, sp. uov. (Type, No. 39630, U. S. N. M.) 



I Head in length of body to base of caudal, 2.7; depth of head, 5; 

 width, 9; depth of body iu lengtb, 3.4; width of body, 9; dorsal, VII, 

 jl — 10; anal III — 7; scales, 8—52 — 10; scales in front of the dorsal, 121. 



Allied to Cpedimacula Poey; the body elongate; the back somewhat 

 elevated; profile concave; nuchal region convex, maxillary reaching 

 a vertical line through the pupil ; 3 in bead. The snout is 3.7 in the 

 bead ; eye large, and is 5 iu tbe head ; preorbital with small sense on 

 the posterior portion, directed backwards; preopercle with nearly 

 equal, distinct teeth on tbe vertical limb; a series of graduated teeth 

 on the horizontal limb; a strong spine at the angle, aud a strong spine 

 next above tbe angle, sometimes bifid ; two flat spines at the angle of 

 the anterior ridge; suprascapula with four strong spines; opercular 

 flap about reaching the vertical from tbe front of the dorsal. 



Gill-rakers G+16 on anterior arch, in lengtb equaling the diameter 

 ', of the pupil. 



Dorsal spines strong, the third beiug tbe highest and strongest; 1.8 

 in the head; the fourth but little shorter, but more slender, their tips, 

 when depressed, scarcely reaching tbe tips of the ventrals. The inser- 

 tion of the first dorsal spine is midway between tip of snout aud last ray 

 of second dorsal. The fourth dorsal spine is U in bead. 



