116 Fretp Museum or NaturAL History — ZooLocy, Vor. X. 
male easily distinguishes this species from the Mollienisia s. tropica 
found in the same region. The specimens collected by me are as 
follows: 
La Junta (14), 38 to 70 mm.; Parismina (11), 58 to 70 mm.; Guapilis 
(18), 27 to 63 mm.; Virginia (4), 35 to 55 mm. 
Mollienisia sphenops (Cuvier & Valenciennes). 
Pecilia sphenops Cuvier & Valenciennes, Hist. Nat. Poiss., xvi, 
1846, 130, pl. 526 (Vera Cruz, Mexico) ;— Regan, Biol. Cent. 
Amer., 1907, 102, pl. x11, figs. 3-7, part. 
Mollientsia sphenops Regan, Ann. & Mag. Nat. Hist., 1913, 1or2 
(part). 
This species is widely distributed and varies greatly. The original 
types were taken at Vera Cruz, Mexico, probably in the salt-water 
pools there where it is very abundant, and where it grows comparatively 
large. I did not do any collecting in salt water in Costa Rica, and so 
did not obtain any specimens, but presume those occurring there are 
the same as those taken at Vera Cruz, Mexico. 
Mollienisia sphenops tropica (Meck). 
Platypecilia tropicus Meek, Pub. Field Mus,, Zool. Ser., vir, 1907, 
146 (Turrialba, Costa Rica). 
Pecilia tenuis Meek, Pub. Field Mus., Zool. Ser., vil, 1907, 147 
(Rio Maria Aguilar, Costa Rica). 
Pecilia tropica Regan, Biol. Cent. Amer., 1908, 191; Regan, Ann. 
& Mag. Nat. Hist., 1908, 459 (Rio Iroquois). 
Pecilia sphenops Regan, Biol. Cent. Amer., 1907, 102, part (San 
José, Costa Rica) ;— Regan, Ann. & fetes: Nat. Hist., 908; 458 
(Volcano of Tenorio). 
Pecilia spilonota Regan, Ann. & Mag. Nat. Hist., 1908, 460 (San 
José, Costa Rica). 
Pecilia caucana Regan (not Steindachner), Biol. Cent. Amer., 1908, 
190, pl. 13, fig. 2 (San José and Rio Maria Aguilar, Costa Rica). 
Pecilia caudata Meek, Pub. Field Mus., Zool. Ser., vil, 1909, 209 
(Turrubales, Costa Rica). 
Mollienisia sphenops Regan, Ann. & Mag. Nat. Hist., 1913, 1012 
(part). 
The inland or fresh-water forms of this species or variety found in 
Costa Rica are very variable, and as a result several species have from 
time to time been described. The upland forms in general are smaller 
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