84 THE CYPRINODONTS. 
Gambusia patruelis. 
Heterandria patruelis B. & G., 1854, P. Phil. Ac., VI, 390. 
Gambusia patruelis Grd., 1859, P. Phil. Ac., 121, — Mex. Bd. Sur., Fishes, 72, pl. 39, fig. 1-7; Jor. 
& C., 1877, B. Buf. Soc., III, 142; Jor., 1878, B. U.S. G. Sur., IV, 434, — 1885, P. U. S. Mus., VII, 320, 
— 1887, R. U.S. F. Com., 338; Garm., 1881, B. M. C. Z., VIII, 93; Hay, 1883, B. U.S. F. Com., II, 66, 74; 
G. & B., 1883, P. U.S. Mus., V, 239; Jor. & G., 1882, B. 16 U.S. Mus., 345, —18838, P. U. S. Mus., V, 
957, — 1887, P. U. 8. Mus., IX, 8, 11, 14, 16, 17, 19, 21, 22, 24; Woolm., 1892, B. U.S. F. Com., X, 
263, 273; Everm., 1892, B. U.S. F. Com., 1891, p. 88; Garm., 1894, B. Essex Inst., XXVI, ext. p. 47; 
Kig., 1894, R. Ind. Biol. Surv., 94. 
Zygonectes patruelis Blk., 1860, Cypr., 486. 
Heterandria affinis B. & G., 1854, P. Phil. Ac., V1, 390; Blk., 1860, Cypr., 485. 
Gambusia affinis Grd., 1859, P. Phil. Ac., 120,— Mex. Bd. Fish, 72, pl. 39, fig. 12-15; Blk., 1860, 
Cypr., 485; Gth., 1866, Cat., VI, 336; Jor. & C., 1877, B. Buf. Soc., III, 142; Jor., 1878, B. U.S. G. Sur., 
LV, 434, —1887, R. U.S. F. Com., 838; Jor. & G, 1882, B. 16 U. 8. Mus., 346; Everm. & K., 1894, 
B. U.S. F. Com., 1892, pp. 66, 75, 76, 78, 79, 81, 83, 87, 89, 90, 92, 107, pl. 25, fig. 2. 
Ganbusia gracilis Grd., 1859, P. Phil. Ac., 121; Trosch, 1865, Verz. Wirb. Mex., 107; Jor. & C., 1877, 
B. Buf. Soc., III, 142; Hig., 1893, P. U.S. Mus., XVI, 57. 
Zygonectes gracilis Blk., 1860, Cypr., 486. 
Gambusia humilis Gth., 1866, Cat., VI, 335, Jor. & G., 1882, B. 16 U. S. Mus., 345; Jor., 1887, R. U. 
S. F. Com., 838. : 
Gambusia holbrookii Jor. & C., 1877, B. Buf. Soc., IIT, 142; Jor., 1878, B. U. 8. G. Sur., TV, 433. 
Zygonectes (Micristius) brachypterus (Cope) Jor., 1878, B. U.S. G. Sur., IV, 483; Jor. &G., 1882, B. 
16 U.S. Mus., 341. 
Zygonectes brachypterus Cope, 1880, B. 20 U. S. Mus., 34. 
B.6; D. 7; A. 10; V.6; P. 12-13; Ll. 30-31; Ltr. 9; Vert. 14+ 19: 
This species is distinguished from G. Holbrookii by a larger eye and a 
smaller dorsal fin. In outlines, squamation, and dentition, the two agree. 
The coloration of G. patruelis is lighter, has less of the brown, and possibly is 
more brilliant in life. The spots on the fins, and that below the eye, are 
fainter or more often absent than in G. Holbrookii. A faint silvery band 
along each flank is very common. 
The eye is large, longer than the snout, two thirds, of the interorbital 
space and two fifths to one third of the head. The normal number of dorsal 
rays appears to be seven, eight is rare, but frequently, especially in males, 
there are but six. In G. Holbrookii normally there are eight dorsal rays, 
rarely seven or nine. The variety gracilis does not differ in the number of 
fin rays, or of scales, but apparently is a trifle more slender and more uni- 
form in coloration, Specimens from the Arkansas and from St. Louis do not 
differ noticeably from those secured in Texas, Louisiana, and Mississippi. 
