Henn: South American Pceciliid Fishes. 117 



and resemble those of Heterandria formosa Agassiz, which is the type 

 of the genus. It is improbable that the genus Heterandria extends so 

 far south, and this species may possibly be a member of Pamphorich- 

 thys Regan. 



Head 4; depth at origin of dorsal 5.3; depth of caudal peduncle 8 

 in length; caudal peduncle twice in head; D. 6-7; A. 7-8; P. 9; V. 6; 

 27 scales in horizontal or lateral series; 7 in transverse series. The 

 eye is rather large, 2.3 in length of head, and is equal to the interorbital 

 width. 



Body rather elongate. Origin of the dorsal about opposite to that 

 of the anal and slightly in advance of the middle of the entire length. 

 Fins only slightly pigmented. Pectorals reach over the middle of the 

 ventrals, which are lanceolate, and have the middle rays longest, 

 reaching to base of anal. Caudal rounded. 



Lateral line a conspicuous black canal from the ninth scale back- 

 ward. Above the lateral line the outlines of the scales are distinctly 

 margined with dark brown chromatophores; below the lateral line 

 these are lighter. The dark peritoneum gives a bluish appearance to 

 the visceral cavity. 



I name the species for Mr. John D. Haseman, to whose energy and 

 zeal as a collector is to be attributed the greater portion of the collection 

 upon which this p9.per is based. 



Genus Neoheterandria Henn, gen. nov. 



Intermediate between Heterandria and Pseudopcecilia. 



The dentition consists of an outer series of widely spaced, long, 

 recurved, conical teeth, with slightly expanded tips and an inner series 

 of small, spike-like teeth in a narrow band. 



Fig. 5. Neoheterandria elegans Henn. Distal end of intromittent organ. X — • 

 No. 5824, Carnegie Museum. Rio Truando. 



Modified anal of the male, a narrow, moderately long organ with a 

 bluntly rounded tip. First and second rays minute; third to seventh 

 rays prolonged and modified. Third ray with a few recurved hooks 



