Jordan and Evermann. — Fishes of North Amei'ica. 3151 
peduncle. Body deep, compressed, 'dorsal outline almost straight from 
snout to origin of dorsal, concave from the latter i>oint to base of caudal; 
ventral outline evenly curved from snout to posterior part of base of anal; 
eye very large, nearer snout than to posterior edge of opercle by a distance 
equal to longitudinal diameter of j)upil; mouth small, its ■^vidth equal to 
f diameter of impil; maxillary protractile; lower javr projecting; teeth 
in 2 series, the outer series small, bicuspid, in a single row, rather firmly 
attached; inner series minute, iu small patches; gill-opening restricted, 
not extending above base of i^ectoral fin; gill-rakers slender, equal in 
length to ^ diameter of pupil. Alimentary canal short; air-bladder large, 
extending 250steriorly to a ftoint above origin of anal; dorsal fin inserted 
halfway between tip of snout and base of caudal, length of base a little 
less than height of fin; anal inserted below middle of dorsal, its edge 
rounded; i>ectoral extending to base of ventrals; ventrals extending to 
vent. Scales on body large ; upper i^osterior jiart of head and a narrow 
siiace below and jiosterior to eye with scales; other jiarts of head naked; 
small scales on basal jiart of caudal fin ; a row of large iiores above eye 
and at- lower edge of suborbital patch of scales; no lateral line. Color 
in alcohol light, yellowish olive; 9 short and narrow vertical bands on 
median part of body, the first above base of pectoral, the ninth at base of 
caudal; scales on dorsal region of body edged with black dots; ujii^er 
part of head dark; upper half of orbit black; opercles silvery; dorsal fin 
with a little dusky; other fins without dark color. 
This sjaecies somewhat resembles C. eiseni iu app)earauce. It differs iu 
having more rays in the dorsal and anal fins, smaller scales, a more com- 
pressed body, and le.ss dark color on the body. (Jordan & Snyder.; 
Known only from Laguna de Chajiala, near Ocotlau, Jalisco, Mexico, 
where J. 0. Snyder collected the tyjje, a female, Ko. 6163, L. S. Jr. Univ. 
Mus. {avKav6rd<:, branded.) 
Characodon cncaustus, Jordan & Snyder, 1!u 11. U. S. Fish Com. 1899 (1900), 126, Laguna 
de Chapala, Mexico. 
Page 685. After Goodea airijyinnis, Jordan, insert: 
313 (a). XENENDUM, Jordan & Snyder. 
Xenendum, Jordan &. Snyder, Bull. F. S. Fish Com. 1899 (1900), 127 (caliente) . 
Body deeji, not much compressed; males and females of about thesame 
size. Eye normal; mouth vertical, lower jaw projecting; teeth loosely 
attached, in 2 series, the first series flat, bicustiid, in 2 or 3 rows on each 
jaw; the second series minute, in villiform bauds, sometimes absent; gill 
oi>ening not restricted, extending above the pectoral lin a distance c(]ual 
to the diameter of jmjiil. Alimentary canal long, with many convolu- 
tions; air-bladder i)resent, large. Scales large; no lateral line. Dorsal 
and anal inserted jiosteriorly, the one directly over the other, their bases 
short; anal very slightly modified in male, first rays shorter, edge double- 
convex — the notch being between smaller and larger groui)s of rays; 
A'entral fins 2)resent; cauilal rounded, and not modified iu male. 
Xeiinuhnn difiers notably from Characodon in having the bicuspid teeth 
loosely attached :iud in more than one series. Characodon has the bicuspid 
