688 Bulletin 47, United States National Museum. 



terminal, slightly oblique; lower jaw slightly projecting; jaws each 

 with a series of small, pointed, movable teeth; gill membranes united. 

 Dorsal fin short, on posterior part of body, its origin above, on a verti- 

 cal from middle of anal, and about midway between end of snout 

 and tip of caudal fin ; anal in males considerably in advance of dorsal, 

 and transformed into an intromittent organ; caudal fin rather long, 

 about 5 in body, slightly dusky at its tip. Color in spirits, brownish 

 olive; a dark band about as wide as eye from mouth through eye and 

 along middle of the side, terminating in a black spot at base of caudal ; 

 band crossed by 6 to 9 brownish-black vertical streaks which become 

 fainter with age, the anterior ones the less prominent ; these markings 

 made up of small dark dots; a black spot on base of dorsal and anal 

 fins. Length, female 1 inch, male f inch. South Carolina to Florida ; 

 exceedingly abundant in the black water of swamps and in ditches, in 

 company with Gambusia affims; said to be the smallest known fish. 

 (formosus, comely.) 



Heterandria formosa, AGASSIZ MS, 1853 ; GIRARD, Proc. Ac. Nat. Sci. Phila., 1859, 62, Charles- 

 ton, South Carolina; Palatka, Florida. 



Girardinus formosus, GUNTHEB, Cat., vi, 354, 1866; JORDAN & GILBERT, Synopsis, 349, 1883; 

 JORDAN & GILBERT, Proc. U. S. Nat. Mus., 1884, 236. 



1014. HETERANDRIA PLEUROSPILUS (Giinther). 



Head 4; depth 3. D.8; A. 9; V. 6; scales 28-8. Eye more than length 

 of snout, 3 in head, and 1 in interorbital space, which is slightly 

 concave. In the female the origin of dorsal is at middle of total length, 

 and conspicuously behind that of anal; caudal fin large, longer than 

 head, subtruncate behind ; free portion of tail somewhat elongate, length 

 of base of anal of its distance from caudal; pectoral fin not quite as 

 long as head and not extending so far backward as the ventral fins, 

 which reach vent; in the male the origin of dorsal is somewhat nearer 

 tip of caudal than that of snout ; the anal process quite straight, nearly 

 twice as long as head, and ending in a simple tapering point; caudal 

 very short. Reddish olive ; a series of 6 or 7 round blackish spots, each 

 about the size of the eye, along the middle of the side; a black line 

 along the base of the anal fin and on lower and upper margins of the 

 tail; caudal fin with 2 indistinct dark cross bands. Females 2 inches 

 long, males 1. Guatemala. (Giinther.) (nfovpov, side; amhos, spot.) 



Girardinus pleurospilus, GUKTHER, Cat., vi, 353, 1866, Lake of Dueftas. (Coll. Salvin.) 

 1015. HETERANDRIA VERSICOLOR (Giinther). 



Head 3f ; depth 3f. D. 8; A. 8; V. 6; scales 27-8. Eye longer than 

 snout, 2i in head, and 1 in interorbital space, which is nearly flat. In 

 the female the origin of dorsal is nearer tip of snout than tip of caudal 

 and opposite second ray of anal; caudal moderate, as long as head, rounded 

 behind; free portion of tail somewhat elongate; length of base of anal 

 f its distance from caudal; pectoral shorter than head, extending some- 

 what beyond root of ventrals, which reach vent. Reddish olive above, 

 sometimes with indistinct silvery crossbars on the side of the tail ; an. 



