Jordan and Ever mann. Fishes of North America. 635 



qq. Body rather slender, the depth 4% to 5 in length; 12 scales in a cross- 

 series; color olivaceous, with numerous crossbars, either black or 

 silvery. DIAPHANUS, 939. 



pp. Anal rays 13; body elongate, the depth 5% in length; olivaceous, with very 

 faint dark crossbars. EXTENSUS, 940. 



oo. Scales very small, about 60-21. 



r. Dorsal rays 14 or 15; anal 13 or 14;' color olivaceous, sides with many dark 

 crossbars; depth 4% in length. ZEBRINUS, 941. 



rr. Dorsal fin very long, of 17 rays; anal rays 13; scales small, about 52 in longitu- 

 dinal series; depth about 4; olivaceous, many scales usually with a dark 

 spot, these forming longitudinal streaks; sometimes faint dark cross- 

 bands. SEMINOLIS, 942. 

 aa. Dorsal fin inserted over or slightly behind front of anal fin; branchiostegals4 or 5; bright 



colored species with orange or brown spots, inhabiting mountain springs and brooks. 

 XENISMA (|ei/i<r/xa, a surprise): 

 s. Scales small, 50 to 53 in lateral line; dorsal and anal large, of 13 to 15 rays each. 



t. Orange spots on sides in regular series, replaced m the female by brown horizon- 

 tal dashes; branchiostegals 5; D. 14; A. 15; depth 4% in length. 



CATENATUS, 943. 



. Orange spots on sides irregularly scattered; branch ioetegals 4; D. 13; A. 13; depth 

 5 in length. STELLIFER, 944. 



GAMBUSINUS (Spanish Gambusino, a fish not worth bringing home. See Gambusia): 

 ss. Transitional species. Scales large, 36 to 42 in lateral line; dorsal and anal small, each 

 of lOorll rays; small species, intermediate between Xenisma or Fundulus&nd Zygo- 

 necles, the dorsal fin small, but not distinctly behind anal. 



H. Anal rays 14; scales 36. Color brownish, finely dotted; lips, top of head, and line 

 along middle of back dark; tail with faint cross-streaks; depth 4% in length. 



LINEATUS, 945. 

 MM. Anal rays 9 to 11. 



v. Scales 38 to 42; body without black crossbars. 



w. Scales 38; olivaceous, with horizontal oblong brownish spots scattered over 

 back and sides; depth 4% in length. RATHBTJNI, 946. 



ww. Scales 42; rows of scales with whitish streaks in males, or narrow black 

 lines in females, forming lines along the rows of scales; depth 4% in 

 length. ALBOLINEATUS, 947. 



w. Scales about 45; body with about 14 irregular dark crossbars; rows of scales 

 of upper parts with longitudinal lines. D. 10; A. 10; depth 3% in 

 length. CONKLUENTUS, 948. 



vvv. Scales about 35, 24 before dorsal; body with about 15 well-marked black 

 crossbands, as in Fundulus similis or F. cingulatits, between which this species 

 seems to find its place; fins plain. D. 9 or 10; A. 9. FUNDULOIDES, 949. 



II. ZYGONECTES (vyov, yoke; VC'KTJ;?, swimmer, the species being said to swim at the surface 

 in pairs). Species with the dorsal fin small, of 7 to 11 rays, its insertion distinctly behind 

 front of anal fin; small species with large scales (29 to 40); surface swimmers, "Top min- 

 nows," seeking insects at the surface of water, 

 a. Anal fin long, of 14 to 25 rays; vomer sometimes with minute teeth. 



I. Anal rays 14; dorsal rays 8; scales 31-8; depth 5 in length; olive, the body plain; dor- 

 sal and anal with dark crossbands; base of caudal with round pale spots. 



DOVII, 950. 

 aa. Anal rays 8 to 13. 



c. General coloration olivaceous, either plain or with pearly or orange spots paler than 

 the ground color, or blackish spots not forming distinct series; no sharply defined 

 black crossbars or longitudinal black stripes. 

 d. Anal rays 12 or 13; body slender, the depth 4 to 5 in length. 



e. Scales 35-12; dorsal 11 or 12; ventrals very small; coloration plain, the fins 



reddish. MACDONALDI, 951. 



ee. Scales 31-10; dorsal rays 10; scales bordered with orange; fins yellow, edged 



with crimson. FLORIPINNIS, 952. 



