Henn: South American Pceciliid Fishes. 95 



my own. For such studies I have had at command more than two 

 thousand of Lebistes reticiilntus and more than eight hundred specimens 

 of Pseudopcecilia fria, representing all sizes and conditions, as well as 

 large numbers of other species. 



This paper was prepared at Indiana University under the super- 

 vision of Professor C. H. Eigenmann, to whom I am under obligations 

 for having given me the opportunity to make these studies, and who 

 aided me by giving me access to the literature, and making valuable 

 critical suggestions. To Dr. W. J. Holland I am indebted for the 

 editorial revision of the manuscript and the reading of the proofs while 

 going through the press. 



New Genera and Species. 



The following new species and genera are described by the author: 

 Rividus compressus sp. nov., 

 Diphyacantha chocoensis gen. et sp. nov., 

 Heterandria hasemani sp. nov., 

 Neoheterandria elegans gen. et sp. nov., 

 Phalloptychns eigenmanni sp. nov., 

 Phallotorynus fasciolatus gen. et sp. nov., 

 Limia hollandi sp. nov. 



The following species, considered to be new, are jointly described 

 by Eigenmann and Henn: 



Rivulus magdalencc sp. nov., 

 Gamhusia caliensis sp. nov. 



The Pceciliid.e. 



The Pceciliidse, or Cyprinodontidae,^ were long placed in the hetero- 

 geneous assemblage of the order Haplomi. Regan (c, 191 1) has lately 

 investigated their structure and placed them along with the blind 

 fishes (Amblyopsidse) in a new order, the Microcyprini. This he 

 divides into the suborders Amblyopsoidea and Pcecilioidea. The 

 principal differences between the Haplomi and the Microcyprini are 

 given in the following extract: " The Haplomi are physostomous, the 

 maxillary enters the gape, the mesethmoid is represented by a pair 

 of dermal bones, and the ribs are borne on autogenous parapophyses. 

 The Microcyprini appear to be physoclistic, the mouth is bordered 



3 Gill (1894, p. lis) gives the reasons for preferring the name Poeciliidae. 



