NEMATODE PARASITES OF BIRDS 237 



440/a long, their anastomosis HO/*, from the head end, and the eggs 

 26/x by 21/x. The tail is conical and ends in a small rounded button. 



Life history. — Unknown; probably involves intermediate stages in 

 other hosts. 



Distribution, — Europe, Africa (Algeria), and North America 

 (United States (National Zoological Park, Washington, D. C.)). 



Genus DISPHARYNX Railliet, Henry, and Sisoff, 1912 



Synonyms. — Acuaria Bremser, 1811, part; Spiroptera Rudolphi. 

 1819, part; Dispharagus Dujardin, 1845, part. 



Generic diagnosis. — Acuariinae (p 211) : Cordons recurrent, not 

 anastomosing. Lateral papillae postcervical, small. Males with 

 spicules unequal and dissimilar. Usually with 5 pairs of postanal 

 papillae. 



Parasitic in esophagus, gizzard and proventriculus of birds. 



Type species. — Dispharynx nasuta (Rudolphi, 1819) Stiles and 

 Hassall, 1920. 



KEY TO SPECIES OF DISPHARYNX 



1. Inadequately described; from Falco tninutus or Rhamphastos vitellinus — 2. 

 Adequately described; from bosts other than above 3. 



2. Lips very small ; cordons short ; from Falco minutus. 



Dispharynx capitata, p. 240. 

 Lips large; cordons long; from Rliamphasios vitellinus. 



Dispharynx crassissima, p. 243. 



3. Male with 7 pairs of postanal papillae ; female 13 to 16 mm. long. 



Dispharynx magnilabiata, p. 241. 



Males with less than 7 pairs of postanal papillae; female not over 11 mm. 



long 4. 



4. Male with 4 pairs of postanal papillae ; longer spicule twice the length of the 



shorter one Dispharynx rectovaginata, p. 243. 



Male with 5 pairs of postanal papillae ; longer spicule either considerably 



more or considerably less than twice the length of the shorter one 5. 



.1. Vulva anterior to middle of body Dispharynx nasuta, p. 237. 



Vulva posterior to middle of body 6. 



6. Postcervical papillae situated posterior to cordons; vulva just posterior to 



middle of body ; longer spicule 2GG> long Dispharynx noctuae, p. 242. 



Postcervical papillae situated between the cordons ; vulva in posterior third 

 of body ; longer spicule 400> long or longer 7. 



7. Postcervical papillae bicuspid ; tail of male about 27:V. of female about 



12<V long; spicules 150/* and 4007* long Dispharynx spiralis, p. 238. 



Postcervical papillae tricuspid; tail of male 370ti, of female 17G> long; 

 spicules 240y, and 865^ long Dispharynx laplantei, p. 241. 



See Addenda, p. 391, for a species of Dispharynx recently described 

 by Smit and Notosoediro. 



DISPHARYNX NASUTA (Rudolphi, 1819) Stiles and Hassall, 1920 



Synonyms.- — Spiroptera nasuta Rudolphi, 1819; Dispharagus 

 nasutus (Rudolphi, 1819) Dujardin, 1845; Acuaria {Dispharynx) 



