104 HAPLOMI. 
5. Pecilia salvatoris. (Tab. XIV. figg. 2, 3.) 
Pecilia thermalis (non Steind.), Giinth. Cat. Fish. vi. p. 341 (1866)*; Jord. & Everm. Bull. U.S. 
Nat. Mus. xlvii. 1896, p. 693 *. 
Pecilia salvatoris, Regan, Ann. Mag. Nat. Hist. (7) xix. 1907, p. 65°. 
Depth of body 33 to 33 in the length, length of head about 33. Snout shorter than eye, the diameter of 
which is 32 in the length of head. Interorbital width equal to the distance from anterior part or middle 
of eye to free edge of operculum. 27 to 30 scales in a longitudinal series. Dorsal 10-11; origin 
equidistant from tip of snout and middle or posterior part of caudal (2); anterior angle rectangular, 
free edge of the fin straight, the rays gradually decreasing in length from the first branched ray 
backwards (9). Anal 8-9; origin below or a little behind that of the dorsal. Pectoral a little 
shorter than the head. Caudal subtruncate. Least depth of caudal peduncle from 3 ( 2 ) to 4 (¢) the 
length of head. Olivaceous; males with more or less distinct cross-bars ; dorsal fin, in the males, with 
2 series of vertically expanded blackish spots, which may or may not be present in the females ; 
caudal, in the males, with oblong spots. 
Hab. Satvavor (Dow 1 8). 
Here described from several specimens, measuring up to 55 mm. in total length. 
6. Pecilia petenensis. 
Pecilia petenensis, Giinth. Cat. Fish. vi. p. 8342 (1866) ', and Trans. Zool. Soc. vi. 1868, p. 484, 
t. 85. figs. 3 & 42; Jord. & Everm. Bull. U.S. Nat. Mus. xlvii. 1896, p. 694°. 
Depth of body 34 (4) to 44 (2) in the length, length of head 42 to 44. Snout as long as eye, the diameter 
of which is 31 to 3 in the length of head. Interorbital width equal to the distance from the middle 
or posterior part of eye to the free edge of operculum. 28 to 30 scales in a longitudinal series. 
Dorsal 10-11; anterior angle rectangular, free edge straight (2); origin equidistant from tip of snout 
and base of caudal(?). Anal 8-9, acutely pointed; origin below the fourth or fifth dorsal ray (2). 
Pectoral as long as the head. Caudal rounded. Least depth of caudal peduncle nearly equal to the 
length of head (3) or about 3 the length of head (Q). Greenish; scales on the upper part of the body 
with dark edges; dorsal and caudal blackish (3) or with small dark spots ( @ ). 
Hab. Guatemata, Lake Peten (Salvin! °). 
Here described from the types, five specimens measuring up to 150 mm. in total 
length. 
7. Pecilia couchiana. (Tab. XIV. fig. 1.) 
Limia couchiana, Girard, Proc. Ac. Philad. 1859, p. 116°. 
Pecilia couchii, Giinth. Cat. Fish. vi. p. 347 (1866) °. 
Pecilia couchiana, Jord. & Everm. Bull, U.S. Nat. Mus. xlvii. 1896, p. 695°; Meek, Publ. Columbian 
Mus., Zool. v. 1904, p. 152°. 
Depth of body about 2% in the length, length of head about 4. Snout a little shorter than eye, the diameter ~ 
of which is 3 in the length of head. Interorbital width equal to the distance from anterior part of eye 
to free edge of operculum. 24 to 27 scales in a longitudinal series. Dorsal 9-11; origin equidistant 
from tip of snout and anterior part of caudal (Q); free edge of fin nearly straight, the branched rays 
subequal (Q). Anal 7-8, pointed, opposite to the posterior half of the dorsal (@). Pectoral nearly as 
long as the head. Caudal rounded or subtruncate. Least depth of caudal peduncle ? to + the length 
of head. Upper half of body dark brownish or blackish, the colour especially dark at the edges of the 
scales: lower part of body usually yellowish and sharply separated from the darker upper part, at 
the lower edge of which there may be a blackish longitudinal band. 
