Jordan and Evermann. — Fishes of N'orth America. 3KU 
115; (<1). CHIROSTOMA DIAZI. Jordan & Snyder. 
Head 3|-; depth 5; depth of caudal peduncle 3} in head; eye 5|; snout 
2A; interorbital space -14-; height of spinous dorsal 4f ; soft dorsal 24; anal 
2f; length of pectoral 1|; ventral 3; caudal 1| ; D. V-11; A. 20; P. 15; 
scales 69-20, 22 between dorsals. Body long, deeper and more com- 
pressed than that of C. humioldtianum; head large, its dorsal contour 
straight from tip of snout to occiput; viewed from above, the head is 
much compressed, the upi^er jaw is sharply pointed and included by the 
lower; interorbital space slightly convex; eye nearer tip of snout than to 
edge of opercle by a distance equal to diameter of pupil; preorbital area a 
little wider than diameter of orbit; mouth oblique, its cleft extending to 
a horizontal from lower edge of orbit; lips thickened posteriorly, the 
lower forming a fold across the upper at angle of mouth; lower jaw pro- 
jecting, the teeth just passing the edge of the upper ; maxillary extending 
to a vertical from anterior edge of orbit, its distal end angular; teeth 
large anteriorly, growing gradually smaller posteriorly, canine-like, sharp, 
projecting backward, not arranged in definite rows, none on vomer or 
palatines; vertebr;e 41. Scales crenate, larger in region of lateral color 
band, growing smaller dorsally and ventrally, abruptly smaller and closely 
crowded together in a region anterior to the pectoral fin, extending from 
the isthmus to the occiput, also between the dorsal fins and along base.s of 
dorsals, anal and caudal; inter-radial membranes of the latter with scales 
extending f its length; head with scales except on jaws, upper part of 
snout, and on preorbital area; two anterior spines of dorsal longest, others 
a little shorter; first dorsal ray longest, others gradually shorter; anal 
similar to soft dorsal in shape, except that its base is much longer; inser- 
tion of anal on a perpendicular passing halfway between dorsals; caudal 
deeply forked, the lobes pointed; pectoral sharp, extending jjaist base of 
ventrals a distance eqnal to diameter of orbit; edge of pectoral, when 
extended, straight. Body, during life, translucent; in alcohol, greenish 
olive; a silvery lateral band, in which the silver is not underlaid with 
black pigment, extending from axil to base of caudal; dorsal scales nar- 
rowly edged with dusky ; upper part of eye dark. Jalisco, Mexico. 
Our specimens are all from the market at Guadalajara. The gill-arches 
and viscera had been removed. The flesh is somewhat shrunken, which 
probably causes the teeth to ajipear more prominent than in life. 
Chirostoma died may be easily distinguished from the other known 
species of the genus by the small scales crowded closely together between 
the dorsal fins. (Jordan <Sc Snyder.) 
Known only from the market at Guadalajara, Jalisco, 5Iexico. (Type, 
No. 6157, L. S. Jr. Univ. Mus. Coll. .1. O. Snyder.) 
(Named for Porfirio Diaz, the honored President of the Reiuiblic of 
Mexico, in recognition of his interest in the progress of .science.) 
Chirontoma diazi, Jokdax .Snyder, Bull. U. S. Fisli Com. lS9i» (190U), i:i7, Guadalajara, 
Mexico, 
