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



Description from specimens 120 to 140 mm. in length, Virginia 

 River. Eggs small, one female contained about 7,000 eggs. 



Cheirodon eigenmanni sp. nov. 



Type No. 7583, F. M. N. H.; length 67 mm.; La Junta, Costa Rica. 



Head 4.2 to 4.4; depth 2.5 to 2.6; D. 1,9; anal 2, 29 to 31; scales 46 to 

 48; 17 or 18 between dorsal and ventrals. 



Body elongate, much compressed; profile evenly convex; top of 

 head convex; fontanelle large; margin of upper lip slightly above level 

 of middle of eye; mouth rather large; jaws subequal; maxillary to first 

 third of eye, its length 2.3 to 2.4 in head; diameter of eye 2.6 to 2.9; 

 snout 3.5 to 3.7; entire edge of maxillary toothed, 2-2 anterior ones 

 denticulate, the remaining 6-6 canine; premaxillary teeth 5-5, denticu- 

 late, in one series; teeth of lower jaw denticulate, in one series of 

 6-6, these followed by 2-2 canine teeth; gill rakers 6+8; dorsal fin high 

 its longest rays about 2.8 in body; base of anal 2.5 to 2.7; pectorals 4.3 

 to 4.7; ventrals 4.3 to 4.5, their tips reaching past origin of anal; caudal 

 peduncle 2.1 to 2.2 in head, lateral line present on about 10 scales. 



Color silvery, a black spot about half as large as eye mostly above 

 and near termination of lateral line; lateral band very narrow anteriorly, 

 becoming darker and broader and ending in an elongated black caudal 

 spot which extends to end of middle caudal rays. 



Named for Dr. C. H. Eigenmann, who has done more than any one 

 else to increase our knowledge of the Characins, the most interesting 

 family of fishes in the fresh waters of the Americas. 



Gambusia umbratilis sp. nov. 



Type No. 7584, F. M. N. H.; length 51 mm.; Guapihs, Costa Rica. 



Head 4.1 to 4.5; depth 3.6 to 3.7; D. 1.7; A. 2.6; scales 7-28. 



Body elongate, profile slightly convex, mouth small, the lower jaw 

 the longer; outer series of teeth the larger; snout short, 4.2 to 4.7 in head; 

 eye 2.5 to 2.8; gill rakers 15; pectoral 1.2 to 1.3; origin of dorsal slightly 

 in advance of anal, midway between base of caudal and eye. Anterior 

 anal rays the longest, i 2 to 1.3 in head; caudal peduncle 1.4 to 1.6 in 

 head. 



This description from females 40 to 58 mm., two males 46 mm. have 

 head 4.0; depth 3.7; eye 2.4 in head, snout 3.8; caudal peduncle 1.4; 

 modified anal reaching slightly more than half way to base of caudal, 

 .73 in head. 



Color dark olivaceous, 6 to 10 dark bars on posterior part of the 

 body much narrower than the interspaces ; dorsal fin with a broad black 

 bar near base and a second one at tip. 



