2G0 On new Freshwater Fishes. 



G. terrabensis, Ht'<i;an, and ( r. Jonesii, Giiniliev*, an 1 with 

 lluMU tonus a series tVoin G. episcopi to (}. {Paeudchcipko- 

 j'horus) bivutcititta, Heck., so tliaf the genus Pseudoxipho- 

 fihui'us ean no longer be maintained. 



Gamhusia terrabensis. 



Depth of body 3^ to 3^ in the length, length of head 3|- to 

 3i. 8nout shorter than eye, the diameter of which is 3 to 3;^ 

 in the length of head ; interorbital width equal to the distance 

 iVom posterior margin of pupil to free iidge of operculuuK 29 

 to 31 scales in a longitudinal series. Dorsal 12-14; origin 

 equidistant from tip of snout and base of caudal or a little 

 nearer the latter. Anal 9-10 ; origin below or a little in 

 advance of the middle of dorsal. Pectoral nearly | the 

 length of head. Caudal subtruncate. Least depth of caudal 

 ])eduncle nearly 3 the length of head. Scales of the upjier 

 part of the body w ith dark edges ; an interrupted dark lateral 

 .stripe; dorsal tin with a basal series of vertically expanded 

 blackish spots and with a second series of smaller spots ; anal 

 dark at the base and also distally ; posterior part of caudal 

 dusky. 



IJab. Costa Rica, Rio Grande de Terraba, Pacific Slope 

 (//. Pit(i'er). 



Sis specimens, measuring up to -48 mm. in total length. 



Sicydium Pittieri. 



Depth of body 6 in the length, length of head 5.\ to 5^. 

 Diameter of eye 5^ to 6 in the length of head, interorbital 

 width 4 to 4.^. Snout obtuse ; mouth subterminal, with 

 lioriz'Uital cleft, extending to below the middle of e3e; uj)per 

 teeth bicuspid ; teeth of the outer series in the lower jaw 

 sometimes concealed. Occipital region covered with small 

 scales; 75 to 80 scales in a longitudinal series; abdomen 

 with a median naked area or strip. Dorsal VI, 1 10; rays 

 of first dorsal (in the males) produced into filaments, the 

 longest, when laid back, nearly reaching the end of the base 

 ot second dorsal ; longest rays of second dorsal a little longer 

 than the head. Anal I 10 ; origin equidistant from eye and 

 base of caudal. Pectoral longer than the head, twice as long 

 as the ventrals. A dark spot on each scale ; dorsal tins witli 

 dark vermiculations ; anal with a daik edge. 



Jlab. Costa Rica, Rio Grande de Terraba (//. Pittier). 



Two specimens (males), VlO and 135 mm. in total length. 



This species is nearest to S. Salvinf, Giant, tVoiu Panauia 

 and Western Ecuador. 

 * MoUienisia Joneifii, (jthr. = rscndoxiphophonis pai/ciiadiatua, Regan. 



