300 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Life history. — Unknown; probably involves intermediate stages 

 in insects. 



Distribution. — Europe (Italy (Rome), and Austria (Museum,, 

 Vienna)), Asia (Russian Turkestan and India), South America 

 (Brazil), Africa (Bou-Saada and Biskra), and Australia. 



The type host of this nematode is evidently Falco (■=■ Accipiter) 

 nisus; however, Rudolphi had in addition specimens from F. gallicus. 

 and F. pennatus, which he lists as this species. Schneider (1866) 

 and also Linstow (1877a) found this species in Falco nisus, and de- 

 scribed and figured it; Seurat (1915&) has described it from that 

 host and from F. biannicus. Ortlepp (1922) examined Rudolphi's- 

 specimens from F. gallicus and F. pennatus, incorrectly called them 

 paratypes and noted differences in lip-structure and in caudal pa- 

 pillae from those described by Schneider, Linstow, and Seurat. Bay- 

 lis (1925), however, calls attention to the fact that the material dealt 

 with by the latter authors was from the type host and that as Ort- 

 lepp states that the material he examined (fig. 361) resembled P. 

 galinieri Seurat, that part of Rudolphi's material may be the latter 

 species. 



The above description of P. dlata is based on those of Schneider, 

 Linstow, and Seurat. 



PHYSALOPTERA MEGALOSTOMA Creplin, 1829 



Synonym. — Spiroptera megalostoma) (Creplin, 1829) Dujardin, 

 1845. 



Hosts. — Primary: Falco nisus and F. palumbarius; secondary: 

 Unknown. 



Location. — Proventriculus. 



Morphology. — Physaloptera (p. 295) : Color brownish; head larger 

 than bod}^. Mouth large, circular, gaping, bare, surrounded by a 

 swollen margin. Body moderately thick, a little more slender an- 

 teriorly than posteriorly. 



Male about 26 mm. long. Tail curved a single time ; alae inflated, 

 joined anteriorly on ventral surface, narrowing laterally as they 

 approach end of tail. Spicules rather short and apparently equal. 



Female about 26 mm. long, somewhat thicker than the male. Tail 



straight, obtuse, tapering toward the extremity. 



Life history. — Unknown ; probably involves intermediate stages in 

 insects. 



Distribution. — Europe (Germany (Greifswald) ). 



Various authors (Mehlis, Molin, Stossich, Lepri) consider this 

 species identical with P. alata Rudolphi, 1819. It is probable that 

 in the specimens described by Creplin (1 male and 1 female) the 

 reflection of the cuticle over the lips is accountable for his descrip- 



