3174 Bulletin 4.7, United States National Museum. 



ventrals; curve of dorsal outline interrupted by a slight elevation above 

 eye and a rather rapid descent at base of soft dorsal ; ventral outline less 

 curved than dorsal; iuterorbital space convex; orbit somewhat elongate 

 laterally, located slightly nearer tip of snout than to posterior edge of 

 opercle, its lower edge a little above a horizontal from mouth to middle 

 of caudal peduncle; cleft of mouth almost horizontal; maxillary, except 

 distal end, concealed by preorbital; lips thick, the lower with a narrow 

 frenum; jaws equal, the upper moderately protractile; teeth in 2 series 

 on each jaw, outer series iu a single row, large, canine-like, far apart; 

 inner series minute, in bauds; tips of teeth brown-colored; no teeth on 

 vomer or palatines. Gill-membranes forming a fold across the isthmus; 

 gill-rakers on first arch 10, short and blunt. Body covered with large 

 weakly-ctenoid scales; head with cycloid scales; upper part of head 

 anterior to middle of orbit, snout, preorbital area, and ventral part of 

 head, naked; a single row of small scales along bases of dorsal and anal 

 fins; small scales on basal part of inter-radial membranes of caudal; lat- 

 eral line interrupted at the fourteenth scale, beginning again 3 scales 

 lower and extending to base of caudal ; first dorsal spine very short, others 

 gradually longer to the sixth or seventh, after which the spines are about 

 the same length; fifth and sixth dorsal rays longest, about 1| times the 

 length of longest spine, depressed fin extending to posterior edge of dark 

 caudal spot ; first anal spine shortest, one-fifth as long as fifth spine, third, 

 fourth, and fifth rays longest; depressed fin extending to anterior edge of 

 caudal spot; caudal fin evenly rounded; pectoral rounded, extending to 

 a vertical from vent; outer rays of pectoral longest, extending to vent. 

 Color in alcohol, light olive, darker above than below ; an indistinct, dark 

 lateral band extending from snout to caudal; 8 or 9 scarcely distinguish- 

 able dark vertical bands on side of body; irregular dark spots at inter- 

 section of lateral and vertical bands; a small, darkspot at base of caudal; 

 small, distinct dark dots on anterior dorsal region of head. 



The total length of the type is 61 mm. Younger examples measuring 

 about 43 mm. have the body a little deeper and the head shorter. The 

 vertical color bands on posterior half of body are more distinct on the 

 younger individuals. Rio Verde, Mexico. (Jordan & Snyder.) 



Cichlasoma steindachneri, JORDAN & SxYDER,Bull. U.S. Fish Com. 1899 (1900), 143, Rio Verde 

 near Rascon, Mexico. (Type, No. 6164, L. S. Jr. Univ. Mus. Coll. J. O. Snyder.) 



Page 1540. Before Theraps, Giinther, insert the following: 

 1948 (a). HEROS ISTLAXUS, Jordan & Snyder. 



Head 2| ; depth 2f; depth of caudal peduncle 7; eje 4| in head; snout 

 2; interorbital space 3-J; longest dorsal spine 2|, ray (without filament) 

 If; longest anal spine 2f, ray (without filament) 1; length of pectoral 

 11; ventrals 1; caudal li; D. XVI, 10; A. V, 7; P. 14; scales 28-18. 

 Body elongate, compressed, deepest above insertion of ventrals; dorsal 

 outline rising rapidly to origin of dorsal, falling gradually to base of last 

 spine, from which the descent to the caudal peduncle is more abrupt; 

 ventral outline evenly rounded; interorbital space convex; eye large, 

 orbit circular, equally distant from tip of snout and posterior edge of 



