998 



MR. C. TATE REGAN ON 



Gambusia umhratilis Meek (Publ. Field Mus., Zool. x. 1912, 

 p. 70) seems to differ from B. rhahdophora only in the larger 

 eye. 



12. Leptorhaphis, gen. nov. 



Differs from Gamhusia only in the structure of the intromittent 

 organ, which is longer and more slender than in that genus and 

 slightly curved backwards distally. The first produced ray is not 

 serrated, gradually tapers distally, and extends nearly to the tip 

 of the fin ; the second is slightly longer and has the posterior 

 branch almost as long as the anterior and with the usual serra- 

 tions, which project externally ; the third ray also seems to reach 

 nearly to the tip of the fin and appears to meet the first and form 

 a complete tube. 



Leptorhaphis infans. 



'i Xiphophorus gracilis Heck. Sitzungsb. Akad. Wien, i. 1848, 

 p. 300, pi. ix. figs. 3, 4. 



Gambusia infans Woolman, Bull. U.S. Fish. Comm. 1894, 



Text-fig. 171. 



Distal part of intromittent organ of A. Fhalloptyclnts jannarius and 

 B. Poeciliopsis istlnnensis. The rays have been separated. 



