298 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



pedunculated papillae, of which 2 are preanal and 2 postanal. Three 

 preanal ventral papillae; 5 pairs of sessile postanal papillae near 

 the median line, of which 2 pairs are in a row just posterior to the 

 anal opening, 2 slightly farther back and the remaining pair about 

 2/3 of the distance from the cloacal aperture to the tip of tail. 

 Spicules unequal, sharply pointed, the left 1.89 to 2.17 mm. long 

 by 45/* wide at the base, the right 420 to 490/* long by 50/* wide. 



Female 20 to 43 mm. long by 800/* to 1.2 mm. wide. Posterior ex- 

 tremity conical, narrowing to a rather acute tip. Anus about 1/56 

 of total body length from posterior end. Vulva far anterior, open- 

 ing on a slight elevation anterior to the end of the esophagus. Mus- 

 cular vagina only about 480/* long by 50/* wide, slightly enlarged 

 posteriorly; 2 uteri arising from the outer sides (fig. 359«). This 

 is the only one of the Pkysaloptera from birds known to have this 



Figs. 359-360. — 359, Physaloptera acuticafda. a, Terminal part of female; 



GENITALIA ; b, MALE TAIL. AFTER ORTLEPP, 1922. 360, PHYSALOPTERA ALATA. C, 



Head; 6, lip; c, male tail. After Linstow, 1S77 



arrangement of uteri; it is similar to that of P. praeputialis, a par- 

 asite of mammals. Eggs 51t«, long by 42/* wide, embryonated in 

 utero. 



Life history. — Unknown; probably involves intermediate stages in 

 insects. 



Distribution. — South America (Brazil) and Africa (Lake Ny- 

 assa). 



PHYSALOPTERA ALATA Rudolphi, 1819 



Synonyms. — Vermis dubius falconis nisi; Physaloptera megalos- 

 toma Creplin, 1829 (probably a synonym; see page 300) ; Spiroptera 

 physalura Dujardin, 1845. 



Hosts. — Primary: Accipiter nisus, Aquila imperialism A. pennata, 

 Astur nisus, Buteo vulgaris, Circaetus gallicus, Circus aeruginosus, 

 C. cineraceus, C. cyaneus, C. rufus, C. pygargus, Falco apivorus, F. 

 atricapillus, F. biarmicus erlangeri, F. cachinans, F. cayennensis, F. 

 coronatus, F. dispar, F. gracilis, F. longipennis, F. ornatus, F. palus- 



