344 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
reaching the front of the anal, in the females reaching the vent; pecto- 
rals reaching past front of ventrals in both sexes. Color olivaceous, 
the scales Avith dark edgings; a very distinct black band in both sexes 
running through eye and snout straight to the base of the caudal, 
Avherc it ends in a round black spot; this band is about as wide as a 
series of scales, although developed on parts of two series; a conspicu- 
ous black band in both sexes along the lower edge of the caudal pedun- 
cle, from the root of the caudal to the vent, dividing and passing on 
each side of the anal fin; tins in the female plain; in the male, basal 
half of dorsal and anal jet Idack, outer half pale with a black edge; 
jiectorals and especially ventrals also dark-edged ; caudal tin faintly 
mottled ; vertical fins with more or less red in life. Head 4 ; dejith 4^. 
I). 0; A. 0. L. IJ inches. Arlington Itiver, Florida, a tributary of the 
Saint John’s. 
(Jorclau, Proc. U. S. Nat. Mus. 1879, 240.) 
101.— GAItIBUSIA Poey.* ** 
(Hcterandria Agassiz.) 
(Poey, Mem. Cuba, i, 382, 1851: type Gambusia punctata Poey, from Cuba.) 
Fody moderately elongate. Mouth medium ; both jaws with a baud 
of conical teeth; snout not produced; the lower jaw prominent. Eyes 
* PSEUDOXIPHOPHORUS Bleeker. 
{rccciUodes Steindaebner.) 
(Bleeker, lebthyol. Ind. Prodr. Cypr. 1860, 483: type Xiphophorus bimaculatus Heckel.) 
This genus has the general characters of Gambusia, differing in the larger size of 
the dorsal fin, which has 14-16 rays instead of 6-10. Mexico, {tpevdo?, false; Xipho- 
phorus.) 
* Anal process ending in a small hook. 
r. bimaculatus (Heckel) Gunther. 
Each scale with a brown orescent; a black spot behind upper end of gill-opening, 
and a round blackish spot on upper half of root of caudal. Head 4 |; dejith 4b B. 6; 
D. 14; A. 10; scales 29-8. L. 4 inches. Mexico. (Gunther.) 
(Xiphophorus bimaculatus Heckel, Sitzgsber. Akad. Wiss. Wien, 1848, 169; Gunther, 
Vi, 332.) 
** Anal process without hook. 
P. reticulatus Troschel. 
Coloration as in the preceding; caudal fin entirely blackish. Depth 6 in total 
length. D. 16; A. 8. Mexico. (Gunther.) 
(Troschel, MUllePs Reise Mexico, iii, App. 104; Giinthcr, vi, 333.) 
BELONESOX Kner. 
(Kner, Sitzgsber. Akatl. Wiss. Wien, 1860, xl, 419: type Belonesox belizanus Kner.) 
Cleft of the mouth much developed laterally, the jaw bones being much i)roduced. 
The iutermaxillaries form together an elongate triangular plate, but are not anchy- 
