Oct., 1907. Fresh-water Fishes — Meek. 145 



Family Charaeiiiidae. 



Astyanax oerstedii (Kroyer). 



Head 4.16; depth 2.82; base of anal 3.09; anal rays 29; longest 

 dorsal ray equalling length of head; pectoral fin 1.15 in head, its tips 

 reaching ventral; ventrals to anal fin; diameter of eye 2.80 in head; 

 interorbital 2.69. 



Color greenish olive, a dark silvery lateral band becoming quite 

 black on its posterior half. 



Turrialba, 600 meters (i), 78 mm.; Rio Siguires (i), 115 mm.; Rio 

 Machuca, 200 meters (i), 116 mm. 



Astyanax sneus (Giinther). Sardinia. 



Head 4.15; depth 3.19; base of anal 3.60; anal rays 25; longest 

 dorsal ray i.ii in head; pectoral fin 1.25 in head, its tip not reaching 

 ventrals. Ventrals not to anal fin; diameter of eye 3.33 in head; in- 

 terorbital 2.50. 



Color olivaceous, lateral band bluish silven,', not darker on its pos- 

 terior half. 



Costa Rica, Pacific side (i), 83 mm.; Rio Siguares, Turricares (i), 

 94 mm. • 



Roeboides g^uatemalensis (Giinther). 



Santo Domingo, 200 meters (2), 103 and no mm. 



Family Pci^ciliidjv. 



Rivulus flabellicauda Regan. Barbudo Roquero; Rimora. 



Centers of scales the darker; fins uniform dark, without dark 

 spots; caudal ocelus present. 



Mr. Regan's description of this species is so brief that I make this 

 identification with some doubt.* 



El Guayabo (3), 54 to 63 mm. 



Qambusia annectens Regan. Olomina. 



Type No. 6025, F. M. N. H.; length 50 mm.; Turrialba, Costa 

 Rica. 



Head 3. 8 to 3. 9 ; depth 3.3 to 3.6; D. 9 one; A.Sor9;scales3i. Body 



♦The specimen described by me as Cynodontichthys (misprinted Cynodonich- 

 this) tenuis, Field Col. Mus. Pub., Zool. Ser., v, 101, is apparently a Rivulus. 



