Oct., 1907. Fresh-water Fishes — Meek. 137 



This species much resembles the former. It differs from that 

 species in having a deeper and more robust body and in having a more 

 uniform coloration. In this species the lateral band is less prominent 

 and there are no, or very few, spots on caudal peduncle and none on 

 dorsal and caudal fins. Head 3.4 to 3.6 in body; depth 2.9 to 3.1; 

 origin of dorsal to snout 1.3 to 1.5; snout 3.4 to 3.6 in head; diameter 

 of eye 3.4 to 3.6; interorbital 2.1 to 2.2; base of dorsal 1.7 to 2.1; 

 base of anal 1.6 to 2.0; pectoral 1.6 to 1.8; ventral 2.3 to 2.5; length 

 of caudal peduncle 1.5 to 1.6; depth of caudal peduncle 1.7 to 1.9; 

 scales 11-35. 



Lake Amatitlan (53), 50 to 90 mm.; Atitlan (i) 54 mm. 



Qambusia fasciata Meek. 



Abundant in lowland streams near Caballo Rlanco The vertical 

 bands on sides vary from 4 to 9. 



Caballo Blanco (100), 40 to 70 mm. 



Heterandria pleurospilus (Gimther). 



Very abundant in lowland streams. The large black spots on the 

 sides distinguish this species from H. lutzi, which it most resembles. 

 This species is only known from the western slope of Isthmus of Te- 

 huantepec and Guatemala. 



Mazatenango (75), 33 to 60 mm.; San Jose del Idolo (180), 30 to 

 75 mm.; Caballo Blanco (18), 35 to 75 mm. 



Heterandria lutzi Meek. 



Mr. Miller found this species to be very abundant in the lower 

 course of the Rio Motagua. It is not known to occur on the Pacific 



slope. 



El Rancho (24), 30 to 75 mm. 



Poecilia sphenops Cuvier & Valenciennes. Pescadito. 



Pcecilia sphenops Cuvier & Valenciennes, Hist. Nat. Poiss., xviii, 

 130, 1846, Vera Cruz: Giinther, Cat., vi, 344, 1866, Vera Cruz: 

 Garman, (part) Mem., Mus., Comp. Zool., 1895, 59- P^- iv, 

 fig. 13, Mexico and Central America: Jordan & Evermann, 

 Bull. 47, U. S. Nat. Mus., 1896, 694: Meek, Field Col. Mus. Pub., 

 Zool. Ser., v, 153, 1904, Monterey and Rio Balsas to Isthmus of 

 Tehuantepec: Miller, Bull. Amer. Mus. Nat. Hist., 1907, 107, 

 Rio Motagua from El Rancho to its mouth. 



