XIPHOPHORUS. 107 
2. Least depth of caudal peduncle greater than the distance from anterior 
margin of eye to free edge of operculum. 
A blackish lateral stripe 2. 2 2. 1. 2... ew 8 strigatus. 
No well-marked lateral stripe . 2. 2. 2. 2. 1 1 ee ee 4 quentheri. 
B. Depth of body 23-23 in the length . . 2. 2 2. 1 2 1 1 1... BL brevis. 
1. Xiphophorus montezume. 
Xiphophorus montezume, Jord. & Snyder, Bull. U.S. Fish. Comm. 1900, p. 131, fig. 11!; Jord. & 
Everm. Bull. U.S. Nat. Mus. xlvii. 1900, p. 3156*; Meek, Publ. Columbian Mus., Zool. v. 
1904. p. 158, fig. 50°. . 
Depth of body about 3 in the length, length of head about 4. 27 to 29 scales in a longitudinal series. 
Dorsal 11-13. Anal 6-8. Yellowish; scales of upper part of body with dark edges; a more or less 
distinct dark stripe from eye to base of caudal. 
Hab. Mexico, Rio Panuco System, Rascon ! 28, 
Here described from a number of specimens from Rascon, measuring up to 60 mm. 
in total length. 
2. Xiphophorus helleri. 
Xiphophorus helleri, Heck. Sitzungsb. Ak. Wien, i. 1848, p. 291, t. 8’. 
Xiphophorus jalape, Meek, Publ. Columbian Mus., Zool. iii. 1902, p. 107’, and v. 1904, p. 1386, t. 11°. 
Depth of body 3 (2) to 4 (¢) in the length, length of head about 4. 27 to 29 scales in a longitudinal 
series. Dorsal 11-13. Anal 8-10. Dorsal rays, in the males, subequal from about the third to the 
ninth or tenth, thence increasing in length to the last. Least depth of caudal peduncle nearly equal to 
the distance from anterior margin of eye to free edge of operculum. Olivaceous ; a well-defined blackish 
lateral stripe from eye to base of caudal; males with a second stripe from axil of pectoral to the lower 
edge of the caudal peduncle. 
Hab. Mexico, Mountain Streams of Central Vera Cruz: 
Jalapa? °, Orizaba |. 
Here described from several specimens from Jalapa, measuring up to 70 mm. in 
total length. Heckel’s figures are not good, but the lower stripe distinctive of the 
males of this form is clearly shown. 
3. Xiphophorus strigatus. (Tab. XIV. fig. 7.) 
Xiphophorus helleri (part.), Giinth. Cat. Fish. vi. p. 349 (1866) *, and Trans. Zool. Soe. vi. 1868, 
p. 485, t. 87. fig. 6°; Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 68, t. 4. fig. 14, and 
t. 8. fig. 4°; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 701°. 
Xiphophorus hellert (non Heck.), Meek, Publ. Columbian Mus., Zool. v. 1904, p. 157°. 
Xiphophorus strigatus, Regan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 65°. 
Depth of body about 33 in the length, length of head 44 to 42. 28 to 30 scales in a longitudinal series. 
Dorsal 12-14. Anal 9-10. Dorsal rays, in the males, subequal from the second or third to the ninth 
or tenth, thence increasing in length to the last. Least depth of caudal peduncle greater than the 
distance from anterior margin of eye to free edge of operculum. Olivaceous; a blackish lateral stripe 
from eye to base of caudal; no additional stripe in the males. 
P2 
od 
