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. 



Male 

 FIG. 54 



GAMBUSIA AFFINIS (BAIRD & GIRARD) 



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) ; P., 71 



(patruelis); L,., 22. 



Length 1^2 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 

 K 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 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. It. 



