Mr. G. A. Boulenger on two neio Fishes. 1G9 



Ouiraca cyanoides, the two nearest allied forms, although it 

 possesses cliaractcrs of both, being an intermediate phase 

 wliich might readily be taken for a hybrid. 



I append dimensions of four species. 



It atfords me much pleasure in naming this new species 

 after the Honourable Walter Rothschild. 



Guiruca argentinn, Sharpe. 

 (Bill robust, culnieu slightly curved.) 



No. Length. "NVing. Tail. Tarsus. Culmeii. 



1. cJ, Coyquin, Cordova, 



Argeutiue Rep. {^E, JJ'. 



White) G7 3-6 3G 



2, $ , Cataraarca, Arg. 



Eep. {E. W. White) . . 6-6 34 3-3 



Guiraca cyanea (Linn.). 

 (Culmeu much curved.) 



1. c?, Brazil 5-9o 2-9 27 



2. „ „ 5-85 2-9 2-8 



3. „ „ 5-4 2-9 2-65 



4. S ) Central America . . o-5 29 285 



5. $, Brazil 5-5 26 26 



Guiraca Rothschildii, sp. n. 

 (Culmen straight.) 



1. cJ, River Carimang .. 6-0 305 2-85 



2. 5, „ „ .. 5-75 2-95 2-o5 



Guiraca cyanoides. 

 (Culmen slightly curved.) 



1. cJ, Panama " 6-2 3-2 2-85 



2. $,Antioquia 6-3 3-0 27 



XIX. — Descriptions of two new Cyprinodontoid Fishes. 

 • By G. A. Boulenger. 



Cyprinodon Danfordii. 



D. 12-13. A. 11-12. V. 5. L. lat. 27-28. L. tr. 11. 



Height of body 2| to 3 times in males, 3^ times in females, 

 in the total length (without caudal) ; length of head 3^ to 3^ 

 times in males, 3f in females. Diameter of eye equal to length 

 of snout and contained 3^ to 31 times in length of head; 

 interorbital space half length of head ; snout short and obtuse. 

 Dorsal not extending when depressed to the caudal ; its origin 



