NEMATODE PARASITES OF BIRDS 



301 



tion of the head, and that he was dealing with liudolphi's species. 

 Since it is a debatable matter, his description and figures (fig. 362) 

 are given here for comparison with those of P. alata. 



PHYSALOPTERA ALATA CHEVREUXI Seurat. 1914i 



Hosts.- — Primary: "Hawk" and Accipiter nisiis; secondary: 

 Unknown. 



Location. — Not given. 



Morphology. — Physaloptera (p. 295) : Similar to P. alata except 

 that this nematode is smaller in size and has the cervical papillae and 

 excretory pore placed much more posteriorly. 



Male 7 mm. long by 515/4 wide. Muscular esophagus 260> long; 

 entire esophagus 1/4 of body length; cervical papillae 370 and 360/4 

 from anterior end. 



Fig. 362. — Physaloptera megalostoma. After Creplin, 1829 



Female (immature), 8 mm. long. Tail long (310/4 ) and conical. 

 Vulva a short distance posterior to end of esophagus. 



Life history. — Unknown; probably involves intermediate stages 

 in insects. 



Distribution. — Africa (Sudan (Bone) and Algeria (Bou-Saada) ). 



PHYSALOPTERA ALATA NOUVELI Seurat, 1915c 



Hosts. — Primary: Accipiter nisus and Aquila chrysaetos; second- 

 ary: Unknown. 



Location. — Esophagus. 



Morphology. — (p. 295) : Body robust, usually attenuated anteriorly- 

 Cervical papillae more or less at the level of the hind end of mus- 

 cular esophagus. Two lateral lips, each with a large triangular 

 external tooth and a very small internal tooth with 3 points. 



Male 22 to 28.5 mm. long by 900/4 wide. Tail 1.105 mm. long, 

 slender and pointed; small cuticular tubercles in circumcloacal re- 

 gion. Caudal papillae as in P. alata. Right spicule robust and 

 large, 550/* long; left spicule more slender, feebly chitinized and 

 longer. 



Female 33 mm. long by 1.05 mm. wide. Tail 1.1 mm. long, coni- 

 cal, pointed. Vulva anterior to end of esophagus. 3.8 mm. from 

 anterior end. Vagina 2.15 mm. long, egg chamber 3.12 mm. long. 



