THE CYPRINODONTS. 121 



1876. B. 1 111. Lab., 42 ; Jor., 1877, P. Phil. Ac, 07,-1878, B. 2 111. Lab., 52, — 1SS7, R. U. S. F. Com., 

 837; Jor. & C, 1877, B. Buf. Soc, III, 142; Porb., 1878, B. 2 111. Lab, 78, 85, — 1883, B. 6, 72, 93; Hay, 

 1883, B. U. S.F. Com., II, 66; Gilb., 18S5, P. U. S. Mus., VII, 208 ; Everm. & J., 1889, P. U. S. Mus., 

 XI, 55 ; Eig., 1894, R. Ind. Biol. Surv., 94. 



Zygonedes (Jdkristius) dispar Jor., 1878, B. U. S. G. Sur., IV, 433,-1878, Man. Vert, 264; Jor. & 

 G., 1882, B. 16 U. S. Mus., 341. 



Zygonedes hierogli/phkus Ag., 1854, Am. Jour., 353, — Fish. Tenn. B,., 15 ; Bile., 1860, Cypr., 485; Jor. 

 & C, 1877, B. Buf. Soc, III, 142 ; Jor. & B., 1878, B. 12 U. S. Mus., 48 ; Jor. & G., 1882, B. 16 U. S. 

 Mus., 341. 



Zi/gonedes (^Micristius) hieroglt/pkicus Jor., 1878, B. U. S. G. Sur., IV, 433. 



Zygonedes melanops Jor., 1878, B. 2 111. Lab., 52 ; Hay, 1881, P. U. S. Mus., Ill, 501 ; Bean, 1882, 

 B. TJ. S. F. Com., I, 206. 



Zygonedes inums Jor. & G., 1882, B. 16, U. S. Mus., 892, — 1883, P. U. S. Mus., V, 143 ; Forb., 1883, 

 B. 6 111. Lab., 71, 93. 



Zygonedes craticula G. & B., 1883, P. U. S. Mus., V, 433 ; Jor., 1887, R. U. S. F. Com., 837. 



Zygonedes zonifer Jor. & M., 1885, P. U. S. Mus., V, 482; Jor., 1887, R. U. S. F. Com., 837. 



Zygonectes Escambia: Bollm., 1887, P. U. S. Mus., IX, 463; Everm., 1893, B. U. S. F. Com., 1891, 

 p. 87 ; Everm. & K., 1894, B. U. S. F. Com., 1892, 78, 83, 90, 92, 107. 



B. 5; D. 8-9; A. 10-11 ; V. 6 j P. 14-12; LI. 34-36; Ltr. 11-12; 

 Vert. 15 + 18. 



Form a little shorter than that of Z. olivacem. Compressed from the 

 head backward ; depressed on the head, crown and nape flattened. Outline 

 less arched from snout to dorsal than from snout to anal. Head broad, about 

 two sevenths of the length to the base of the caudal or two ninths of the 

 total. Snout nearly or quite as long as eye, varying with age, slightly nar- 

 rowed at the mouth, blunt. Mouth of moderate size, a trifle oblique ; lower 

 jaws longer, firmly united ; upper shorter, protractile. Teeth in bands, coni- 

 cal, hooked, outer series larger; pharyngeal with a shoulder. Eye large, 

 about as long as the snout, one third or less of the head, two thirds of the 

 forehead. Scales large, extending upon the base of the caudal. Intestine as 

 long as the body excluding head and caudal. Dorsal and anal of medium 

 size and rounded margins, opposed, behind the middle of total length ; dorsal 

 smaller and originating a little farther back than the anal, the comparative 

 position of the origin varying slightly with age and sex. The base of the 

 dorsal extends little if any nearer the caudal than that of the anal. Caudal 

 large, median rays longer, posterior border convex, almost pointed. Ventrals 

 small, not reaching the anal. Pectorals small, reaching to, or a little beyond, 

 a vertical from the bases of the ventrals. 



The northern variety, Z. lineoMus Ag., shows a tendency to more scales 

 and fin rays than the .southern or typical forms. 



Olivaceous, greenish, yellowish, reddish or brownish, lighter to silver}' 

 below, each scale with a brown more or less distinct spot, forming vitta?. 



16 



