& PROCEEDINGS OF THE NATIONAL MUSEUM vol. 78 



we have regarded E. querqiietulae Boulenger as a typographical 

 error, the species name evidently being based on the host name 

 Querquedula, and at the suggestion of Dr. C. W. Stiles this is 

 amended to E. querquedulue. 



KEY TO THE SPECIES OF THE GENUS EPOMIDIOSTOMUM 



1. Front surface of the bead provided dorsaily as well as veutrally with a pair 



of flaplike ornaments, bent backward 2. 



Front surface of the head provided dorsaily as well as ventrally with a pair of 



conelike ornaments, directed subdorsally and subventrally respectively 3. 



2. Males 6.5 to 7.3 mm. long, females 10 to 11.5 mm. long; spicules 120ai long, 



dividing distally into three branches E. uncinatum. 



Males S.S to 10.5 mm. long, females 13 to 14.5 mm. long; spicules 200^ long, 



dividing distally into two unequal branches E, querquedulae. 



3. Males 10.8 mm. long, females 16.7 mm. long ; spicules 200/* long, dividing 

 distally into threa branches; mouth-opening not guarded by four toothlike 



formations E, orispinum. 



Mouth opening guarded by four tooth-like formations 4. 



4. Males 9.5 to 11.5 mm. long, females 15 to 17 mm. long; head provided with 

 four submedian " warts;" dorsal ray dividing distally into two small branches. 



E. skrjahiiii. 



Males 9.5 to 10.5 mm. long, females 17 to 19 mm. long; head without four 



submedian " warts," lateral papillae or amphids with a pair of glistening 



supports ; dorsal ray dividing distally into four small branches E. crami. 



The writer desires to acknowledge his indebtedness to Dr. M. C. 

 Hall, Chief of the Zoological Division, Bureau of Animal Industry, 

 United States Department of Agriculture, for the facilities placed at 

 his disposal during a stay in the United States made possible by a 

 fellowship from the International Health Board of the Hockefeller 

 Foundation, and also to Dr. E. B. Cram for her helpful advice in 

 the preparation of this paper. 



REFERENCES 



Baylis, H. a. ; and Daubney, R. 



1926. — A synopsis of the families and genera of nematoda. London, British 

 Museum, pp. 192-193. 

 Bayxis, H. a. 



1929.— A manual of Helminthology. London, pp. 201-202. 



BOTTLENGB3J. C. L. 



1926. — Report on a collection of parasitic nematodes, mainly from Egypt. 

 Part 4. Trichostrongylidae and Strongj'lidae. Parasitology, vol. 

 18, pp. 91-92, figs. 8-10. 

 Cram. Eloisb B. 



1927. — Bird parasites of the nematode suborders Strongylata, Ascaridata, 

 and Spirurata. U. S. Natl. Mus. Bull. 140, pp. 26-29, and p. 384. 

 LuNDAHi., Carl. 



1848. — Bemerkungen tiber zwei neue Strongylus-Arten. Notis. Sallsk. pro 

 Fauna et Flora Fenn. Forh. Helsingfors, Hiift. 1, pp. 283-287. 



