4G0 Mr. 0. T. Regan on 



2. Dorsal with free edge nearly straight, the first branched ray 

 the longest. 

 Origin of dorsal equidistant from end of snout 



and posterior edge of caudal tin, or nearer 



the former ; pectoral extending to above 



middle of pelvics; 30 to 33 scales in a [1866. 



longitudinal series 3. elongata, Giinth., 



Origin of dorsal nearer to posterior edge of 



caudal fin than to end of snout ; pectoral 



extending to base of pelvics ; 30 scales in a 



longitudinal series 4. retropinna, sp. n. 



II. Origin of anal below or a little behind that of the dorsal ; origin of 

 dorsal nearer to base of caudal fin than to end of snout. 



A. Depth of body 2§ to 3f in the length ; 26 to 30 scales in a longi- 



tudinal series. 

 Dorsal 8-11, rounded, the middle rays the [1840. 



longest 5. sphenops,Q\x\. & Yal.. 



Dorsal 8-9, with the free edge a little convex, 



the anterior branched rays the longest; eye 



small, its diameter 3j to 3§ in the length 



of head (in specimens of 32 to 52 mm.) . . 6. spilonota, sp. n.* 

 Dorsal 10-11, with the free edge straight, the 



first branched ray the longest ; eye rather 



small, its diameter 3j in the length of head [1907. 



(in specimens of 55 mm.) 7. sahatoris, Regan, 



Dorsal 9-10, with the free edge straight, the 



first branched ray the longest ; eye large, 



its diameter 2f to 3 in the length of head 



(in specimens of 00 to 100 mm.) 8. tropica, Meek, 1907. 



B. Depth of body 4 to 4A in the length ; 31 scales in a longitudinal 



series 9. tenuis, Meek, 1907. 



* Poecilia spilonota, sp. n. 



Poccilia sj)henops (part.), Regan, Biol. Centr.-Am., Pise. p. 102, t. xiii. 

 fig. 2 (1907). 



Depth of body 3 to 3§ in the length, length of head 3f to 4. Snout 

 shorter than eye, the diameter of which is 3} to 3§ in the length of 

 head. Interorbital width equal to or a little longer than the postorbital 

 part of head. 27 to 29 scales in a longitudinal series. Dorsal 8-9 ; 

 origin equidistant from end of snout and posterior part ( 9 ) or middle 

 (<£ ) of caudal fin ; free edge a little convex, the second branched ray the 

 longest. Anal 8-9 ; origin below or a little behind that of the dorsal. 

 Pectoral shorter than the head, extending to above anterior part of 

 pelvics ( $ ). Caudal rounded. Least depth of caudal f to f the length 

 of head. Olivaceous ; a black spot at the base of the dorsal fin. 



San Jose. 



Six specimens, 32 to 52 mm. in total length. 



This species may not be distinct from P. tenuis, Meek, which is 

 described as having a longer body (depth 4 to 4| in the length) and 

 smaller scales (31 in a longitudinal series). P. caucana, Steind., seems to 

 differ in the larger eye, 2\ to 3 in the length of head in specimens of 32 

 to 43 mm. 



