4 Emrmann and Goldsborovgh — Fishes from the Canal Zone. 



'Sir. Jennings says tliii^ species grows to a length of at least 8 inches, and 

 he did not observe it at any other point. 



Brycon striatulus ( Kner). 

 ^?ix specimens o to 334 inches. 



Astyanax fischeri Steindachner. 



( »ne specinu-n o inches long from Comacho River helow reservoir dam 

 at Empire, Jtme IS. 



Astyanax a^neus (Giinther). 



Two specimens 2% and l''f{ inches long from Comacho Kiver below res- 

 ervoir dam at P^mpire, Jnne 18 ; twelve specimens '^'g to 2% inches long, no 

 definite locality; one 13^ inches long from Tabernilla, taken in January; 

 anil two, 1^4 and l)^ inches long, from a shiggish stream emptying into a 

 dammed-up lake at Gatnn, August 15. The specimen from Tabernilla was 

 kept by Mr. Jennings in an aipiarium for more than o months. It ate 

 3o mosquito larvje in one day and 20 the next. 



Astyanax mexicanus (Filipi)i). 



Five specimens I's to 2i<, inches long; mi delinite data given. These 

 have the dorsal unifonnly with i> rays ; anal ll> or 14, + 2 or o short simple 

 rays; scales o3 to 35; teeth in maxillary in 2 rows, 2 teeth in outer and 

 4 in inner row; outside of this outer maxillary row is a single irregular 

 row of teeth in the ]ireinaxillary. These specimens agree well with typical 

 mciicanus, except in the number of anal rays; mexicanus is said to have 

 from 17 to 24 branched rays; none of ours has more than 14. 



Roeboides guatemalensis (Gimther). 

 Six specimens 2% tn '.)% inches long; no definite locality given. Dor- 

 .sal 10; anal 40 to 50; gillrakers (i -,-^0; scales 78-85, 



F.\.Mii.Y rcECTLIID.E. 



THE KILLIFIsriES. 



Rivulus isthmensis Garmau, 



One specimen 1 incli long from a swampy, freshwater pond l)y side of 

 railroad atGatun, .fuly 15. Lives on bottom. 



Qambusia nicaraguensis (iunther. 



.'~^ix specimens 1 to 1 r",^ inches long ^frrim Cristobal, August 4. Mr. .k'U- 

 uings says these liave a spot on side near vent. This spot is now evident 

 in l)nt two of the specimens. It is dusky brown and covers 3 or 4 scales 

 just above vent, it not being on tiie scale immediately over vent. Three 

 specimens % to I,',; inches long from Folks River Swamji at Cristobal, 

 July 8, and four ]14 to 1% inches long from same place, August 4. 



Gambusia episcopi Steindacliner. 



Fourteen specimens Ito 13^' inches long; no definite locality given. These 

 all show distinctly the black sj)ot at base of anal wliich seems to be char- 

 acteristic of this species. One si)ecimen 138 inches long from swampy 



