694 Bulletin 47, United States National Museum. 



to root of caudal, behind that of the anal, above the twelfth scale of the 

 lateral series ; dorsal fin higher than long, its longest ray shorter than 

 head ; enlarged anal ray without terminal appendage. Eight longi- 

 tudinal series of scales on each side of the tail. Caudal rather short, its 

 basal half covered with scales. Uniform greenish, with golden reflec- 

 tions ; dorsal and caudal black. Length 3| inches. Rio Chisoy, Vera 

 Paz. (Gunther.) 



Pcecilia chisoyensis, GUNTHER, Cat., vi, 342, Rio Chisoy, Vera Paz, in basin of Rio Usumacinta. 

 (Coll. Godman & Salvin.) 



1027. PGECILIA PETENENSIS, Gunther. 



Head 4 in male, 5 in female; depth 3i in male, 4 in female. D. 11; 

 A. 8 ; scales 29-30-8 or 9 ; vertebrae 16 -f- 14. Eye equal to snout, 3i in 

 head, somewhat more than half interorbital width. Origin of dorsal fin 

 farther from root of caudal than from occiput, over eleventh or twelfth 

 scale of lateral series : origin of anal opposite fourth ray of dorsal fin (in 

 the female); dorsal fin of moderate size; anal rather small, but pointed ; 

 caudal scaly on its basal third ; free portion of tail compressed, rather 

 high, its least depth half its length, equal to length of head without snout. 

 Seven longitudinal series of scales on each side of the tail. Male with the 

 dorsal fin somewhat elevated, the longest ray being rattier longer than the 

 head; anal fin modified into an intromittent organ, and advanced to 

 between the ventrals, in front of the dorsal. Tail strongly compressed, 

 and much higher than in the female, its least depth being equal to the 

 length of the head. Greenish, each scale with a black vertical spot; 

 dorsal and basal half of the anal irregularly and finely marbled with 

 brown. Length 6 inches. Lake Peten. (Gunther.) 

 Pcecilia pelenensis, GUNTHER, Cat., vi, 342, 1866, Lake Peten in Guatemala. (Coll. Salvin.) 



1028. P<ECILIA SPHENOPS, Cuvier & Valenciennes. 



Head 3f ; depth 3i. D. 9; A. 8; scales 28-8. Eye equal to snout, 3| in 

 head, a little more than half interorbital width. Origin of dorsal midway 

 between root of caudal and occiput, over thirteenth scale of lateral 

 series; origin of anal opposite that of dorsal (in the female); dor- 

 sal of moderate size anal small; caudal scaly at the base only. Tail 

 compressed, rather high, its least depth equal to length of head without 

 snout. Eight longitudinal series of scales on each side of the tail. 

 Greenish, each scale darker at the base ; back of the tail with narrow, 

 irregular, silvery crossbars. Male with the dorsal flu somewhat elevated, 

 but the longest ray scarcely as long as the head without snout; this 

 fin is ornamented with round, black spots ; anal fin modified into an 

 intromittent organ, and advanced to between the ventrals. Tail strongly 

 compressed, and comparatively higher than in the female. Caudal fin 

 with oblong black spots on the interradial membrane of the basal half, 

 with a broad, whitish, posterior marginal band, and narrow black edge. 

 The female has the dorsal only spotted with black. Length 3 inches. 

 Vera Cruz, Mexico. (Giiuther.) (o<j>qv, wedge; ui/;, face; " museau en 

 coin," peaked-face.) 



Pcecilia sphenops, CUVIER & VALENCIENNES, Hist. Nat. Poiss., xvm, 130, 1846, Vera Cruz; GON- 

 THER, Cat., vi, 343, 1866. 



