60 THE CYPRINODONTS. 
Pecilia petenensis Gth., 1866, Cat., VI, 342, — 1868, Tr. Zool. Soc. Lond., VI, 484, pl. 85, fig. 3, 4; 
Hig., 1893, P. U.S. Mus., XVI, 57. 
Pecilia dovii Gth., 1866, Cat., VI, 344; Gill, 1877, P. Phil. Ac., 187; Hig., 1893, P. U. S. Mus., 
ass spilurus Gth,, 1866, Cat., VI, 345; Hig., 1893, P. U. S. Mus., XVI, 57. 
Pecilia Butleri Jor., 1889, P. U. 8. Mus., XI, 330; Eig., 1893, P. U. 8. Mus., XVI, 57. 
(Mollinesia fasciata Pet., 1844, Ber. Ak. Wiss. Berl., 36 ; Blk. 1860, Cypr., 485 ; Pecilia fasciata Hig. 
1893, P. U. S. Mus., XVI, 57, may refer to this species. Whether it does.can only be decided by the origi- 
nal specimen. “D.8; A. 9; mit dunkeln Querbinden; Mexico,” is all that was said of it.) 
B.6; D.10-9; A. 9-10; V.6; P.15; LI. 25-28; Ltr. 9-8; Vert. 
14+ 14. 
Body not much elongate, greatly compressed, depth of large specimens 
near one third of the length to the base of the caudal; caudal pedicel deep. 
Head three and two thirds times in the length of the body without the cau- 
dal, not as wide as deep, slightly arched across the crown. Snout moderate, 
blunt ; chin steep. Mouth rather small, directed upward ; lower jaws longer, 
loosely joined; upper short, protractile. Teeth in the outer series slender, 
movable, broadened and hooked toward the apex; inner teeth in bands, 
tricuspid. Eye large, longer than the snout, more than half of the inter- 
orbital space, four thirteenths of the head. Dorsal larger than anal, first 
ray about midway from occiput to base of caudal. First ray of anal below 
second or third of dorsal, base or tip not reaching as far backward as those 
of the latter. Anal modified on the male, much advanced, between the ven- 
trals, hardly as long as the head. Caudal deep, as long as the head, slightly 
convex, scaly toward the base. Scales large. Intestine long. 
Olivaceous, light or yellowish to dark, edges of scales darker, with or 
without irregular blotches of black scattered over back and sides ; sometimes 
clouded or blotched with brownish or with faint vertical bands of lighter. 
Lower half of head and belly silvery to golden. Dorsal usually marked 
with rather large to very small spots of black, scattered or in transverse 
series. Caudal plain or marked with spots like the dorsal. Fins commonly 
darkened toward the tips. Top of head dark. Male with larger fins and 
more spots than the female. Young with transverse markings which persist on 
some of the older ones. This species is subject to considerable variation. A 
larger collection than we now possess is necessary to determine what varieties 
are included. 
Mexico to Central America. 
