107 FISHES OF SINALOA. 479 
Hiead’'3°3: depthi23 DAI “16 ean Eras eve: (5 1n 
head; snout nearly 2; pectoral 1%; highest dorsal spine 
3 in body; ventral 2% in’length; anal lobe 2%; dorsal 
lobe 134 in body. 
Body compressed and deep; dorsal outline from snout 
to caudal peduncle uniform; breast prominent and well 
rounded, behind which the ventral outline is straight to 
anal spine, then slanting obliquely upward to caudal pe- 
duncle. Mouth wide with thick lips: the teeth flat, sharp 
and movable, in a single row in each jaw, those in the 
upper jaw are arranged in a crescent, in the lower jaw 
they are in a straight line in front, but at the sides they 
describe nearly a right angle and run back; isthmus with 
a notch made by the prominence of the breast. Tip of 
snout, maxillary and lower jaw naked; head everywhere 
else with scales, the scales on cheeks in about 5 rows; 
scales on body large, 3-28-99; all the fins with scales. 
Accessory scales very few. 
Lateral line running high and ending under last ray of 
soft dorsal; gill-rakers numerous, short and weak, about 
5-21. Pectoral short and rounded at the tip; ventrals 
with the middle rays produced, 2% times ventral spine, 
reaching past vent to anal; spinous dorsal low; with 
the exception of the first the spines are about equal; soft 
dorsal and anal falcate and filamentous, the dorsal lobe 
slightly the longer, not quite reaching to tip of caudal fin; 
caudal widely forked, the lobes falcate, the upper lobe the 
longer; the middle rays are contained 3% times in the 
upper caudal lobe. 
Specimens described twelve inches in length (Nos. 
GLO, 1626 and 2005, Lo. jr. Univ. Mus:). 
In life, deep indigo blue, with traces of olivaceous 
cross-shades. Pectoral, dorsal and caudal edged with 
bluish white. Eyes violet. : 
The species feeds on plants. 
