The Fresh Water Fishes of the Island of F'ormosa. 257 



The present description is from a specimen from Shori, collected by 

 T. Aoki in February, 1917. 



Habitat: The present species is very common in rice-fields and pools 

 on the island. My specimens came from Shori; Ako; and Giran 

 (Kizanto and Taiko). 



Measurements of Oryzias latipes. 



Genus Gambusia Poey. 

 1855. Gambusia Poey, Mem. Cub., I, p. 382. (Type Gambusia punctata Poey.) 



Body moderately elongate, becoming deep in the adult female. 

 Mouth moderate, the lower jaw projecting, the bones well joined; 

 both jaws with a band of pointed teeth which are not movable; snout 

 not produced. Eyes normal, not divided. Scales large. Gill- 

 openings not restricted. Dorsal and anal fins both rather short and 

 small, the anal more or less in advance of the dorsal; anal fin of the 

 male much advanced and modified into a long intromittent organ, 

 which is about as long as head. Intestinal canal short. Six branchios- 

 tegals. X'ertebrae about thirty-two. (Jordan & Evermann.) 



Distribution: Mexico; Cuba; Southern States of North America. 



48. Gambusia affinis (Baird & Girard). 

 Top-minnow. 



1853. Heterandria affinis Baird & Girard, Proc. Ac. Nat. Sci. Philad., p. 390; 



Texas. 

 1859. Gambusia speciosa Girard, Proc. Ac. Nat. Sci. Philad., p. 121; Rio San 



Diego, New Ulm, Mexico. 

 1859. Gambusia gracilis Girard, Proc. Ac. Nat. Sci. Philad., p. 121; Mexico. 

 1866. Gambusia humilis GOnther, Cat. Fish., VI, p. 334. 

 1866. Gambusia affinis Gunther, Cat. Fish., VI, p. 336; Texas. — Evermann & 



Kendall, Bull. U. S. Fish. Comm., XII, 1892, p. 107, PI. 25; Fig. 2. — 



Jordan & Evermann, Bull. U. S. Nat. Mus., 47, 1896, p. 680 (in part). 



18 — dec. 19, 19 19. 



