52 THE CYPRINODOXTS. 



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 M. Mipinna. 



Mollienisia Jonesii- 



MoUienesia Jonesii Gthr., 1S74, Ami. Mag. Nat. Hist, (4), XIV, 371 ; Jor. & G., 1SS2, B. 16 U. S. 

 Mus., 347 ; Eig.. 1893, P. U. S. Mus., XVI, 57. 



" D. 12 ; A. 10 ; LI. 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 innnaculate. 



" This species was discovered by T. M. Rymer Jones, Esq., in a volcanic 

 lake, Alcohuaca, 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." 



PCECILIA. 



Poecilia Bl. Schn., 1801, Syst., pp. lii, 452 ; Cuv., 1817, K Au., II, 198, — 1829, R. An.,n, 280, — 1836, 

 R. An., I, 532 ; Aiisl., 182S, Syst. Besch., IV, 319 ; Val., 182S, Hunib. Obs., II, 156,-1846, C. V. Poiss., 

 XVIII, 112, — 1840, R. An., cd. iU., Poiss., 227 ; Wagn., 1828, Isis, XXI, 1054 ; Scliinz, 1S36, Abb. Fisclic, 

 216; Poey, 1855, Mem., I, 381; Blk., 1860, Cypr., 483,485; Gtli., 1S66, Cat., VI, 339 — 1880, lutr., 

 317; Jor., 1887, P. U. S. Miis., IX, 564. 



Gambiisia Blk., 1860, Cypr., 485. 



Heteraiidria Jor., 1887, P. U. S. Mus., IX, 563. 



In eacli of the foregoing, species belonging to other genera were included. The followi-g mention only 

 species liere retained in the genus. 



Ptecilia Flcm., 1822, Phil. Zool., II, 386; M. & Tr., 1848, Schomb. Guiana, III, 632; Blk., 1863, 

 Atl., Ill, 140; Kner, 1867, Novara Fisciie, 345. 



Limia Poey, 1855, Mem., I, 383, 390,-1861, Mem., II, 383,-1868, Repert., 11, 209, 411, — 1S76, 

 An. See. Esp., V, 141. 



Lebistes Filippi, 1861, Arch, per la Zool., Canestr., I, 69. 



