GAMBUSIA 



215 



Dr. Eigenmann found ripe females in Turkey creek, Indiana, 

 June 27 ; and we have taken specimens greatly distended with eggs 

 between the 16th and the 27th of the same month. 



Genus GAMBUSIA Poey 



Bodv moderately elongate, becoming deep in the adult female; head 

 flat above; mouth moderate; lower jaw projecting; both jaws with bands 

 of pointed teeth; dorsal and anal fins rather short and small, the anal 

 more or less in advance of the dorsal and in the male much advanced and 

 modified into a long intromittent organ; scales as in Fundulus. 



,.<!?sX«Sl!^ 



Female 



Male 

 Fig. 54 



GAMBUSIA AFFINIS (Baird & Girard) 

 (viviparous top-minnow) 



Baird and Girard, 1853, Proc. Ac. Nat. Sci. Phila., 390 (Heterandria). 



G., VI, 334, 335, 336 (holbrooki, humilis, and affinis) ; J. & G., 345, 346 (patruelis, 



humilis, affinis), 340, 341, 892 (Zygonectes atrilatus, brachypterus, inurus) ; 



M. v., 87 (patruelis); }. & E., I, 680; J., 52 (Zygonectes menalops) ; F., 71 



(patruelis); L., 22. 



Length IJ to 2 inches; body robust and not much elongate, con- 

 siderably compressed ; depth 3 . 7 to 4 . 3 in length ; greatest width of body 

 about f of its depth; depth of caudal peduncle 2 . 1 to 2 .4 in its length. 

 Color "light olive, each scale edged with darker; a very narrow dark 

 streak* along sides; top of head dusky; a more or less distinct triangular 

 bluish-black bar below eye; sides and belly anteriorly dusky with dark 

 dots; a black blotch on each side of belly, caused by the black internal 

 organs showing through the skin ; young specimens often uniformly yel- 

 lowish ; fins dusky; the caudal usually with cross series of dots". Head 

 short, broad, and flat above, 3 . 7 to 4 in length; width of head 1.4 to 



*Not evident in our preserved material. — R. E. R. 



