NOTES ON TREMATODE PARASITES OF BIRDS 



By Edwin Linton 

 Of the Zoological Laboratory, University of Pennsylvania 



With two exceptions the hosts from which the trematodes de- 

 scribed in this paper were obtained belong to the Woods Hole, Mass., 

 region. 



Unless otherwise designated, all material obtained in the months of 

 September to June, inclusive, was collected by the late Vinal N. 

 Edwards. Notes on living material, as well as notes resulting from 

 a preliminary examination of formalin material, were made in the 

 course of successive summers at the laboratory of the United States 

 Bureau of Fisheries, Woods Hole, Mass'. 



List of trematodes referred to in these notes with their hosts. 



Parasite Host 



Haematotrephus fodiens, new species Oavia immer. 



Psilostomum lineatum, new species Larus argentatus. 



Psilostomum plicitum, new species Larus argentatus. 



Psilostomum varium, new species Oavia imm^r. 



Petasiger nitidus, new species Colymhus auritus. 



Sim,asthla elongata (Mehlis) Larus argentatus. 



delaivarensis. 

 marinus. 

 Philadelphia. 

 Nycticorax nycticorax naevius. 



Himasthla incisa, new species Oidemia deglandi. 



Mesorchis pseudoechinatus (Olsson) Larus argentatus. 



atricilla. 

 delawarensis. 

 marinus. 

 Philadelphia. 

 Colymhus holiolli. 

 Gavia immer. 



Aporchis rugosus, new species Sterna paradisea. 



Stephanochasmus sp Ceryle alcyon. 



Cryptocotyle lingua (Creplin) Butorides vircscens. 



Gavia immer. 

 Larus argentatus. 

 atricilla. 

 delawai-ensis. 



No. 2722— PROCEEDINGS U. S. NATIONAL MUSEUM, VOL. 73. ART. 1 

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