302 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



trunk or trompe 500/* long, dividing posteriorly into 2 uteri. Eggs 

 50 by 25/*, thick-shelled, embryonated. 



Life history. — Unknown; probably involves intermediate stages 

 in insects. 



Distribution. — Africa (Algeria (Bou-Saada)). 



PHYSALOPTERA CRASSA Linstow, 1879b 



Host. — Primary : Alauda arvensis; secondary : Unknown. 



Location. — Intestine. 



Morphology. — Physaloptera (p. 295) : Lips pyramid-shaped, each 

 with 2 teeth, the inner tripartite, and in addition 2 outer papillae. 

 Cervical papillae 600/* from anterior end; esophagus 1/4.7 of total 

 body length. 



Male 14 mm. long by 1.5 mm. wide. Tail rounded, its length 

 about 1/12 of total body length. Six pairs of caudal papillae, the 

 anterior 5 being pedunculated and situated near the cloacal aper- 

 ture; the sixth pair non-pedunculated, situated on the inner side of the 

 fifth pair. Spicules unequal, 660/x and 360/x long. 



Female 23 mm. long by 2 mm. wide. Tail rounded, its length 1/22 

 of total body length. Eggs 49/* long by 26/* wide. 



Life history. — Unknown; probably involves intermediate stages 

 in insects. 



Distribution. — Europe (Germany (Stuttgart)). 



PHYSALOPTERA CROSI Seurat. 1914i 



Host. — Primary: Accipiter nisus; secondary: Unknown. 



Location. — Proventriculus. 



Morphology. — Physaloptera (p. 295) : Body robust. Two lateral 

 lips (fig. 363 a), each with a large external tooth, strongly chitinized 

 and an inner tripartite tooth, much smaller and feebly chitinized. 

 Also 2 pairs cephalic papillae at angle of insertion of lips. Post- 

 cervical papillae unusually far anterior, immediately posterior to the 

 nerve ring. 



Male 20 mm. long by 660/* wide. Caudal alae (fig. 363 b) well- 

 developed; circumcloacal region covered with tubercles. Cloacal 

 aperture 900/* from tail end. Caudal papillae arranged as in P. 

 galinieri and P. subalata except that in this species there is a sessile 

 papilla between the 2 papillae of the most posterior ventral pair. 

 Spicules equal, short, 300/* long. 



Female 12 mm. (immature) to 22 mm. long. Tail (fig. 363 c) 

 short (300/*), conical. Vulva in anterior third of body, 1 mm. pos- 

 terior to end of esophagus. Vagina shorter than egg-chamber (res- 

 ervoir), which is 1.2 mm. long by 300/* wide; trunk (trompe) 400/* 

 long, giving rise to 2 uteri. Eggs 55/t long by 25/* wide, embryo- 

 nated. 



