Abt, 6 TWO NEW NEMATODES FROM DEER DIKMANS 5 



2. Distal portion of spicule divided into one ventral, one dorsal, and 



one median process 8 



Distal portion of spicule divided into three processes, of whicli 



two arise from the inner or median border of the spicule 9 



3. Outer ventral process obliquely truncated at end 4 



Outer ventral process not obliquely truncated at end 5 



4. Dorsal ray 280ai to 300/;i long ; bifurcations 80/i to 100,i4 long occidentalis 



Dorsal ray 244/i to 320^ long ; bifurcations 40m to 80fi long skrjabini 



5. Outer ventral process of spicule sharply pointed and recurved 



medially 6 



Outer ventral process of spicule divided distally into three 

 processes; dorsal branch barbed 7 



6. Accessory bursa supported by two lyre-shaped rays lyrata 



Accessory bursa supported by two straight rays ; bifurcations of 



dorsal ray without lateral branches mossi 



7. Outer ventral process of spicule straight ; dorsal process barbed marshalli 



Dorsal process of spicule truncated odocoilei 



8. Bifurcations of dorsal ray without lateral branches ostertagi 



Bifurcations of dorsal ray with lateral branches appendiculata 



9. Right spicule terminating in a short, corkscrewlike hook ; outer 



process of spicule not truncated ; gubernaculum absent bisonis 



Right spicule not terminating in a corkscrewlike hook ; outer 

 process of spicule truncated ; gubernaculum present trifurcata 



GBODP D. TERMINATION OB" SPICULE NOT DETERMINED 



1. Stem of dorsal ray five times the length of its branches brigantiaca 



Stem of dorsal ray very small 2 



2. Spicules complex, IGSfi to 170ai long ransomi 



Spicules less than 150« long 3 



3. Spicules hollowed out in the shape of a gutter, 134/i long callis 



Spicules not hollowed out, 91ai long delicata 



The spicules of 0. callis are figured on Plate 17 of Trav- 

 assos's monograph of the Trichostrongylidae (1921a), but it is im- 

 possible to determine the nature of the termination of the spicules 

 from his figures. They are therefore included in Group D. 



REFERENCES 

 Chapin, Edwabd a. 



1925. New nematodes from North American mammals. .Tourn. Agr. Re- 

 search, U. S. Dept. Agr., vol. 30, April 1, pp. 677-681, figs. 1-4. 



KAXANTAraAN, E. V. 



1928. K. faune trikostrongilid ovets Armenii (Zur Trichostrongyliden- 



fauna der Schafe Armeniens). [Russian text.] Trudy Gosudarstv. 



inst. eksper. vet., vol. 5, no. 2, pp. 40-57, figs. 1-24. 

 Peteov, a. M., and Shakhovtseva, E. S. 



1928. Zur Charakteristik des Nematoden aus dem Schafe — Ostertagia 



turkcstanica Petrow und Schachowzewa, 1926. Deutsche tierarztl. 



Wchnschr., vol. 36, no. 4, August, pp. 527-530, figs. 1-4. 

 Ransom, B. H. 



1911. The nematodes parasitic in the alimentary tract of cattle, sheep, 



and other ruminants. Bull. 127. Bur. Animal Industry, U. S. Dept. Agr., 



May 13, 132 pp., figs. 1-152. 



