232 Mr. C. T. Regan on the 



through eye to base of caudal ; 10 to 12 dark cross-bars ; 

 dorsal, anal, and pelvic fins with series of dark spots ; caudal 

 dusky. 



Three specimens, 30 to 40 mm. in total length. 



This species is very closely related to G. interruptum, 

 Pellegrin (Bull. Mus. Paris, 1909, p. 151\ from Serra 

 d'Estrello, Rio Grande do Sul, in which the lateralline runs 

 on 9 scales to below the origin of the dorsal fin, which has 

 only 11 rays. 



Corydoras macropteriis. 



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

 3^ to 3f. Diameter of eye 5j interorbital width 2^ to 2\, 

 length of snout 2 to 2^ in the length of head. Suborbital 

 narrow ; cheek covered with short bristles, strongest in males ; 

 barbels nearly reaching gill-opening. Dorsal I 8 ; spine 

 about ^ the length of head ; .fin very elevated, second and 

 third rays longest, when laid back reaching tip of adipose 

 fin ( ? ) or base of caudal {S) '■> base of dorsal rather less 

 than its distance from adipose fin, which is preceded by 

 3 to 5 median scutes. Anal I 6-7. Pectoral very long, 

 extending to origin of anal. Scutes 24-2 5/2 J-22 ; liumeral 

 shields wide apart, each separated by 2 scutes from base 

 of pelvic fin. 3 or 4 dark blotches on the back, more 

 or less alternating with others on the lower part of the side, 

 both series connected with an irregular lateral band ; dorsal 

 and caudal barred with series of spots ; lower fins dusky. 



Four specimens, 55 to 65 mm. in total length. 



In coloration and in the bristles on the cheeks this species 

 shows relationship to G. kronei, Ribeiro, but it differs in the 

 shorter snout and broader interorbital region and especially 

 in the produced dorsal and pectoral fins. 



XXIII. — The Pceciliid Fishp.s of the Genus Jenynsia. 

 By C. Tate Regan, M.A. 



(Published by permission of the Trustees of the British Museum.) 



For many years the only known species of the genus 

 Jenynsia was J. lineata, Jenyns *, originally described from 

 Maidonado and Montevideo. In 1902 a second species, 



* For the synonymy v. Garman, Mem. Mus. Comp. Zool. xix. 1897, 

 p. 69. 



