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 



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. 



Fsmale 



Male 

 Fig. .54 



GAMBUSIA AFFINIS (Baird & Giraed) 



VIVIPAROUS TOP-MINNOW 

 (Map LXVI) 



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); J. & E., I, 680; J., 52 (Zygonectes menalops) ; F., 71 



(patruelis); L., 22. 



Length 13^^ to 2 inches; body robust and not much elongate, consider- 

 ably compressed; depth 3.7 to 4.3 in length; greatest width of body about 

 % 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 b^^ the black internal organs showing through 

 the skin; young specimens often uniformly yellowish; 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 1.6 in its length; interorbital space 2 to 2.5 

 in head; eye 2.6 to 3.2; nose 2.8 to 3.6; maxillary 2.8 to 3.4; mandible equal 

 to eye; lower jaw slightly longer than upper; teeth in broad villiform bands. 



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



