GAMBUSIA 



215 



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

 June 2 7 ; and we have taken specimens greatly distended with eggs 

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



Genus GAMBUSIA Poey 



Body 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. 



Female 



Male 

 Fig. 54 



GAMBUSIA AFFINIS (Baird & Girard) 

 (viviparous top-minnow) 



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



<i , VI, 534, 335, 536 (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; [., 52 (Zygonectes menalops); F., 71 



(patruelis); L., 22 



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

 siderably compressed; depth 3.7 to 4 .3 in length; greatest width of body 

 aboul ; 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 anteriorlv dusky with dark 

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



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

 lowish ; (ins dusky ; the caudal usually wil h en >ss series of d< its". 1 lead 

 short, broad, and flat above, 3.7 to 4 in length; width of head I .4 to 



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



