NEMATODE PARASITES OF BIRDS 297 



14. Spicules subequal (360 and 380,u long) ; vulva a little anterior to middle of 



body Physaloptera galinieri, p. 303. 



Spicules unequal (400 and S40fi long) ; vulva at anterior third of body 

 length Physaloptera subalata, p. 305. 



15. Female 7 mm. long; only one simple tooth on each lip. 



Physaloptera, inflata, p. 305. 

 Female 19 mm. long; the large conical tooth of each lip has to each side of 

 it a smaller tooth ; additional still smaller teeth present internally. 



Physaloptera gemina, p. 304. 



16. In orbital cavity of Ibis aethiopica; head with wing-like appendages and 2 



or more papillae or small lips Physaloptera, species Parona, p. 309. 



In alimentary canal (or in P. malleus location not given) of other hosts 

 than above ; head structure different from above 17. 



17. Description very incomplete: alae described as vesicular; in Cuculus, species, 



Brazil Physaloptera strongylina, p. 309. 



Alae not described as vesicular ; in other hosts than above, in Africa or 

 Europe 18. 



18. Mouth with 2 lips ; 4 pairs of preanal pedunculated papillae 19. 



Mouth with 6 lip structures ; 2 pairs of preanal pedunculated papillae 20. 



19. In the middle of each lip a papilla and to each side of the papilla a cone- 



shaped tooth ; spicules equal ; tail of male 1/69 of body length ; eggs 39/* 



long by 2Gfi wide Physaloptera brevicauda, p. 307. 



No papillae or teeth described on lips ; spicules unequal ; tail of male 1/33 

 of body length ; eggs 46,u long by 29fi wide Physaloptera malleus, p. 308. 



20. Spicules equal (290^ long) ; tail of male 1/14, of female 1/53 of body length ; 



vulva in anterior third of body Physaloptera ovata, p. 309. 



Spicules very unequal (SNOm and 2.17 mm. long) ; tail of male 1/46, of female 

 1/21 of total body length ; vulva near posterior extremity of body. Species 

 recently transferred to Cyrnea Physaloptera bulbosa, p. 310. 



PHYSALOPTERA ACUTICAUDA Molin. 1860 



Synonym. — Physaloptera data Rudolphi of Diesing, 1851 in part. 



Hosts. — Primary: Elanus caeruleus, Falco atticaplllus (=Spi~l- 

 ■cw+er melanoleucus) , F. cachlnans {=Eerpetotheres cachinans), F. 

 eayennensis (=zLeptodon cayennensis) , F. cm^onatus (=HarpyIia- 

 liaetus coronatus), F. dispar (= Elanus leucurus), F. gracilis 

 { — Geranosplzlas caerulescens) , F. minutus (=Acdpiter tinus), F. 

 ornatus (=Splzaetus mauduytlj, F. palustris (—Circus maculosus), 

 F. species, F. swainsonll (=camps07iyx swal?isotu), F. ruiilans 

 {=TIeterosplzkis meridio nails) , F. uniclnctus {—Parabuteo unicinc- 

 ius), F. wubutinga {Vrubitinga urubltlnya) ; secondary: Unknown. 



Location, — Mouth, esophagus, gizzard, orbital cavity. 



Morphology.- -Physaloptera (p. 295) : Cuticle finely striated trans- 

 versely, partly reflected over the lips anteriorly. Mouth with 2 lips, 

 their anterior border semicircular; each lip with a large pointed 

 outer tooth and internal to it a smaller membranous tooth with 3 

 denticulations. 



Male 18 to 32 mm. long by 620 to 800/x wide. Caudal alae (fig. 

 359&) long, semilanceolate, supported by 4 pairs of equidistant 



