Jordan and Evcrmann. Fishes of North America. 3151 



peduncle. Body deep, compressed, dorsal outline almost straight 

 snout to origin of dorsal, concave from the latter point 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 pupil ; mouth small, its width equal to 

 diameter of pupil; maxillary protractile; lower jaw projecting; teeth 

 in 2 series, the outer series small, bicuspid, in a single row, rather firmly 

 attached; inner series minute, in small patches; gill-opening restricted, 

 not extending above base of pectoral fin; gill-rakers slender, equal in 

 length to I diameter of pupil. Alimentary canal short; air-bladder large, 

 extending posteriorly to a point above origin of anal; dorsal fin inserted 

 halfway between tjp 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; pectoral extending to base of ventrals; ventrals extending to 

 vent. Scales on body large ; upper posterior part of head and a narrow 

 space below and posterior to eye with scales; other parts of head naked; 

 small scales on basal part of caudal fin; a row of large pores 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; upper 

 part of head dark ; upper half of orbit black ; opercles silvery ; dorsal fin 

 with a little dusky; other fins without dark color. 



This species somewhat resembles C. eiseni in appearance. It differs in 

 having more rays in the dorsal and anal fins, smaller scales, a more com- 

 pressed body, and less dark color on the body. (Jordan & Suyder.) 



Known only from Laguna de Chapala, near Ocotlan, Jalisco, Mexico, 

 where J. O. Snyder collected the type, a female, No. 6163, L. S. Jr. Univ. 

 Mus. (evKavtiros, branded.) 



Characodon encaustus, JORDAN & SNYDER, Bull. TJ. S. Fish Com. 1899 (1900), 126, Laguna 

 de Chapala, Mexico. 



Page 685. After Goodea atripinnis, Jordan, insert: 



313 (a). XENENDUM, Jordan & Snyder. 

 Xenendum, JORDAN & SNYDER, Bull. U. S. Fish Com. 1899 (1900), 127 (caliente). 



Body deep, not much compressed ; males and females of about the same 

 size. Eye normal; mouth vertical, lower jaw projecting; teeth loosely 

 attached, in 2 series, the first series flat, bicuspid, in 2 or 3 rows on each 

 jaw; the second series minute, in villiform bauds, sometimes absent; gill 

 opening not restricted, extending above the pectoral fin a distance equal 

 to the diameter of pupil. Alimentary canal long, with many convolu- 

 tions; air-bladder present, large. Scales large; no lateral line. Dorsal 

 and anal inserted posteriorly, 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 groups of rays; 

 ventral fins present ; caudal rounded, and not modified in male. 



Xencndnm differs notably from Characodon in having the bicuspid teeth 

 loosely attached :.ud in more than one series. Characodon has the bicuspid 



