PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued l^^\\y> ^*^ll ^y tf>f 



SMITHSONIAN INSTITUTION 

 U. S. NATIONAL MUSEUM 



Vol. 86 Washington: 1939 No. 3055 



NEW SPECIES OF FLATWORINIS FROM NORTH. CENTRAL, 

 AND SOUTH AMERICA 



By Libbip: H. Hyman 



A NUMBER of preserved specimens of Tiirbellaria collected in var- 

 ious parts of North, Central, and South America sent to me for 

 identification by the United States National Museum have all been 

 found to be new species except one. Most of these were fortunately 

 in full sexual maturity, so that it is possible to furnish a complete 

 diagnosis. Those not in the sexual state are also undoubtedly new 

 forms, but a complete description of them must await the fortunate 

 finding of sexually mature material. 



Order TRICLADIDA 

 Suborder Paludicola, or Probursalia 

 Family PLANARHDAE 



Genus DUGESIA Girard, 1850 



In the author's opinion, Dugesia Girard is a valid genus, of which 

 Euplanaria Hesse, 1897, is a synonym. 



DUGESIA TITICACANA, new species 



Figure 47, a-c 



Material examined. — Three specimens, two sexually mature, thiid 

 young. Both sexual specimens cut into sagittal serial sections, but in 

 one the posterior end with the copulatory apparatus was missing. 

 The other one has hence been made the type. 



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