Henn: South American Pceciliid Fishes. 141 



2866, C. M., one, the type, 43 mm. 2867. C. M., thirteen, paratypes, 



17-45 "ini- Rio Iguassu system, near Serrinha Parana, Brazil. 



Haseman. 



Head 4-4.5; depth at origin of dorsal about equal to head; depth of 

 caudal peduncle 7.6-7.8 in length to base of caudal and 2 in head. 



Eye 3.3 in head. Interorbital 1.5 in eye. 



D. 8-9; A. 7-9; P. 14; V. 6; scales 16-17 between occipital and dorsal; 

 32-33 in lateral line; 8-9 in transverse series. The posterior 18-21 

 scales in the lateral series have a conspicuous central pit, or pore, the 

 only approach to the usual lateral line pores, I have seen in any Poeciliid. 



The dentition is composed of an outer series of compressed tricuspids, 

 an inner series partly of smaller tricuspids and partly of spike-like 

 incisors. 



This species differs from the other members of the genus in being 

 more elongate and more compressed. It differs also in coloration. 



A broad, horizontal, purplish lateral band formed by continuous 

 blotches. In young specimens this is a narrow broken line. Ventral 

 half of body darker. Belly prominent, yellowish in color. Fins with- 

 out color, caudal truncate. 



36. Fitzroyia maculata (Regan). 



Jenynsia maculata Regan, Ann. Mag. Nat. Hist., (7), XVIII, 1906, p. 154 

 (Cachi, Salta, Argentina); ibid., (8), XI, 1913, p. 233. 



4667, C. M. Eleven, five males, 20-31 mm., six females, 20-52 mm. 

 Arroyo Miguelete, Montevideo. Haseman. 



4668, C. M. Twenty, 13-20 mm. Monte, Argentina. Haseman. 



4669, C. M. Fifteen, three males, nine females, three young. 11-55 

 mm. Near Colorado, Rio Colorado, Argentina. Haseman. 

 Range: Uruguay and Argentina. 



Head 3.4-4; depth at origin of dorsal 4-4.5; depth of caudal peduncle 

 6.5-7 ill length to base of caudal and 1.8-2 in head. Eye prominent, 

 3.4-4 in head; about equal to interorbital. Interocular width about 

 2.4 in head. 



D. 8-9; A. 9-10; P. 14; V. 6; scales 12 between occipital and dorsal; 

 28-30 in lateral line; 8 in transverse series. 



Origin of dorsal about opposite that of anal, sometimes slightly 

 anterior. In males the anal is sometimes slightly in advance of the 

 dorsal. Fins without color; pectoral large and round, caudal sub- 

 truncate or slightly rounded. 



