neio Freshwater Fishes. 259 



Pimehdus Rogersi. 



Depth of body 6 in the length, length of iieal 5. Head l\ 

 as long as broad. Diameter of eye 6 in the length of head, 

 interorbital width 3, length of snout 3. Head covered with 

 smooth skin ; fontanel not extending beyond the level of 

 posterior margin of eye ; occipital process short. Maxillary 

 barbel extending to middle of pectoral fin. Dorsal I 6, the 

 spine slender, the fin rounded, higher than long. Adipose 

 fin as long as or a little longer than its distance from the 

 dorsal, about | the length of the fish. Anal 12-14. Pectoral 

 spine nearly 5 the length of the fin and nearly | the length of 

 head, its inner edge with a series of rather small denticula- 

 tions, Ventrals originating behind the last dorsal ray, ex- 

 tending ^ the distance from their base to the origin of anal. 

 Caudal with a sliallow notch. Least depth of caudal peduncle 

 I the length of head. Brownish. 



I^ah. Costa Rica, Irazu (//. Rogers). 



Four specimens, measuring up to 130 mm. in total length. 



Allied to P. JSalvini, Gthr., which has a longer adipose 

 fin (f the length of the fish), a shorter pectoral spine (less 

 than ^ the length of head), a shorter anal fin with 11 rays, 

 and the caudal more deeply notched. 



Gamhusia annectens. 



Depth of body 3 to 3?, in the length, length of head 3^ to 

 3|. Snout as long as or shorter than eye, the diameter of 

 which is 3 to 3q in the length of head ; interorbital width 

 equal to the distance from middle or posterior part of eye to 

 free edge of operculum. 28 to 31 scales in a longitudinal 

 series. Dorsal 10-12; origin equidistant from tip of snout 

 and middle or posterior part of caudal ; free edge of the tin 

 convex. Anal 9-10, pointed, originating a little in advance 

 of the dorsal. Pectoral about ^ the length of head. Caudal 

 rounded or subtruncatc. Least depth of caudal peduncle 

 about § the length of head. ^Scales with dark edges, forming 

 series of spots on the lower part of the side ; often a series of 

 short dark vertical bars along the middle of the side; a series 

 of dark spots on the lower part of tiie dorsal fin. 



Ilab. Costa Kica, Carrullo and Juan Vefias {Underwood) ; 

 Iiazu {Rogers). 



Numerous specimens, measuring up to 70 mm. in total 

 length. 



This species is very close to O. episcopi, Steind., from 

 Panama, which has only 8 or 9 dorsal rays and also ditfers in 

 having a blackish spot on the anal fin. It is also close to 



