86 Field Museum of Natural History — Zoology, Vol. X. 



Family P(ECILIID.E: 



Rivulus brunneus sp. nov. 



Type No. 7593, F. M. N. H.; length 41 mm.; Toro Point, Canal 

 Zone, Panama. 



Head 3.4 to 3.6; depth 4.7 to 4.8; D. 8 or 9; A. 12 to 14; scales 38 to 

 40. 



Body robust; head rather broader than deep; diameter of eye 3.2 

 to 3.4 in head; origin of dorsal over posterior third of anal; last ray 

 of anal about opposite sixth ra}^ of dorsal; origin of dorsal to base of 

 caudal 2.5 in its distance from eye, about midwaj'^ between tip of caudal 

 and anterior margin of opercle; pectoral 1.4 to 1.5 in head, their tips 

 not reaching ventrals. 



Color bro^vTiish, sides sHghtly speckled with darker; tip of anal rays 

 black; a black stripe from tmder side of caudal peduncle to end of lower 

 caudal rays, in some specimens the upper caudal rays ^with a similar 

 bar, these not prominent in the smaller specimens; caudal and dorsal 

 with few faint spots. In life the upper parts of the body gra\4sh with 

 shades of pink; belly pale wnth shades of pink, fins all reddish; base 

 of caudal and anal deep red. 



Atlantic slope of central Panama. 



Gambusia cascajalensis sp. nov. 



Type No. 7594, F. M. N. H.; length 55 mm.; Rio Cascajal, Porto 

 Bello, Panama. 



Head 3.7 to 3.8; depth 3.7 to 3.8; D. I, 6; A. II, 7; scales 8-26. 



Body elongate, compressed; the dorsal region slightly elevated; 

 mouth small, the gape extending about y^ distance to eye; lower jaw 

 the longer; the teeth in both jaws in several series, the outer shghtly 

 enlarged; snout 3.1 to 3.2 in head; eye 2.9 to 3.1; origin of dorsal over 

 last anal rays, its distance from base of caudal 1.9 to 2.1 in its distance 

 from tip of snout, about midway between tip of caudal fin and eye; 

 anal falciform, its anterior ra>'^ the longer, their length about 1.2 in 

 head, their tips reaching beyond tips of last rays when the fin is deflexed; 

 ventrals reaching nearly to anal; caudal fin rounded; giU-rakers 12; 

 caudal peduncle 1.8 in head, 13 scales before dorsal fin. 



Color olivaceous; base of anal and anterior rays black, tip of dorsal 

 rays black; a broad dark curved bar at base of caudal rays, rather in- 

 distinct in some specimens. 



Rio Cascajal, Atlantic slope of Panama. 



