52 THE CYPRINODONTS. 
The figures of this species show the caudal on females to be nearly or quite 
truncate, while on the male it is indented in the lower half and the lower 
edge is produced in a sharp angle that bears a remote resemblance to the 
prolongation on the male of Xiphophorus. The transformations of dorsal 
and ventrals due to age and sex in this species are similar to those obtaining 
on MM. latipinna. 
Mollienisia Jonesii. 
Mollienesia Jonesii Gthr., 1874, Ann. Mag. Nat. Hist., (4), XIV, 371; Jor. & G., 1882, B.16 U.S. 
Mus., 347; Hig., 1898, P. U. S. Mus., XVI, 57. 
“Dp. 12; A. 10; Ll. 29; Ltr. 9: 
“ Female. The height of the body is two sevenths or one fourth of the total 
length (without caudal), the length of the head one fourth. The diameter of 
the eye is rather shorter than the snout, one fourth of the length of the head, 
and one half of the width of the interorbital space. The length of the dorsal 
fin is one fourth of the distance between the eye and the root of the caudal ; 
it is much longer than high. Anal fin small, opposite to the middle of the 
dorsal. Lateral line none. Brownish, each scale with a deep-black hind 
margin; a black band between the eye and scapula; a round black spot on 
the upper half of the root of the caudal. Dorsal fin with two or three series 
of black spots ; anal with a black line behind and along each ray ; the other 
fins immaculate. 
“This species was discovered by T. M. Rymer Jones, Esq., in a volcanic 
lake, Aleohuaca, near Huamantla, in Mexico, 8000 feet above the level of 
the sea. Several specimens were presented by him to the British Museum ; 
all are females ; and the largest exceeds somewhat the length of 3 inches.” 
PCCILIA. 
Pecilia Bl. Schn., 1801, Syst., pp. lii, 452 ; Cuv., 1817, R. An., IT, 198, — 1829, R. An, IT, 280, — 1836, 
R. An., I, 532; Ansl., 1828, Syst. Besch., [V, 319; Val., 1828, Humb. Obs., I, 156, —1846, C. V. Poiss., 
XVIII, 112, — 1840, R. An., ed. ill., Poiss., 227; Wagn., 1828, Isis, XXI, 1054; Schinz, 1836, Abb. Fische, 
216; Poey, 1855, Mem., I, 381; Blk., 1860, Cypr., 483, 485; Gth., 1866, Cat., VI, 389 — 1880, Intr., 
317; Jor., 1887, P. U. S. Mus., TX, 564. 
Gambusia Blk., 1860, Cypr., 485. 
Heterandria Jor., 1887, P. U. S. Mus., IX, 563. 
In each of the foregoing, species belonging to other genera were included. The followi~g mention only 
species here retained in the genus. 
Pecilia Flem., 1822, Phil. Zool., IT, 386; M. & Tr., 1848, Schomb. Guiana, ITT, 632; Blk., 1863, 
Atl., II, 140; Kner, 1867, Novara Fische, 345. 
Limia Poey, 1855, Mem., I, 383, 390, — 1861, Mem., II, 888, —1868, Repert., II, 209, 411, — 1876, 
An. Soc. Esp., V, 141. 
Lebistes Filippi, 1861, Arch. per la Zool., Canestr., I, 69. 
