12 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



elongate, with 2 lateral processes partially inclosing the cloacal lumen 

 and forming an incomplete ring through which the spicules pass. 

 Female with vulva in posterior half of the body. Eggs usually seg- 

 mented or embryonated in uterus. Parasitic in intestine or proven- 

 triculus of birds. 



Type species. — Ornithostrongylus fariai Travassos, 19145. 



The pattern of the bursal rays is so divergent in the species included 

 by Travassos in this genus as to raise a doubt as to whether all of 

 these species are congeneric. 



KEY TO SPECIES OF ORNITHOSTRONGYLUS 



1. Males less than 5 mm. and females less than 6 mm. long. Spicules 140 to 



150/t long. Anus 80/i and vulva 800/t from tip of tail. In ostrich. 



Ornithostrongylus douglasi, p. 14. 

 Males more than 6 and females more than 8 mm. long 2. 



2. Males less than 7 mm. and females less than 9 mm. long. Spicules 140/* 



long, with 2 spines at their anterior third. Eggs 80//, long. In Otis tarda. 



Ornithostrongylus papillatus, p. 16. 



Males more than 8 mm. and females more than 16 mm. long. Spicules 150 to 



285/t long. Eggs not over 75/4 long 3 



3. Spicules 220/1 long. Eggs 30/t by 21m- In Europe. 



Ornithostrongylus hastatus, p. 17. 



Spicules less than 200/x or more than 275/t long. Eggs not less than 70/x by 



38/z. In Western Hemisphere and Australia 4 



4. Male up to 12 mm. and female up to 24 mm. long. Anus 400/i from tip of 



tail. Spicules 150 to 160//. long. From pigeon; United States and 



Australia Ornithostrongylus quadriradiatus, p. 12. 



Male not over 10 and female not over 20 mm. long. Anus 250 to 284/1 from 

 tip of tail. Spicules 285/a long. From Leptotila ruf axilla; Brazil. 



Ornithostrongylus fariai, p. 13. 



ORNITHOSTRONGYLUS QUADRIRADIATUS (Stevenson, 1904) Travassos. 1914 



Synonyms. — Strongylus quadriradiatus Stevenson, 1904; Tricho- 

 strongylus quadriradiatus (Stevenson, 1904) Shipley, 1909; Cepha- 

 lostrongylus quadriradiatus (Stevenson, 1904) Irwin-Smith, 1920. 



Hosts. — Goluiriba livia domestica. 



Location. — Intestine. 



Morphology. — Ornithostrongylus (p. 11) : Delicate, slender worms. 

 The cuticle about the head is inflated to form a vesicular enlarge- 

 ment. The mouth is simple, unarmed and without visible papillae. 

 Cuticle longitudinally striated. Worm red when freshty collected, 

 apparently from ingested blood in the intestine. Esophagus 450/^ 

 long. 



Male 9 to 12 mm. long. The bursa (fig. 5) is bilobed, with no dis- 

 tinct dorsal lobe. The ventro-ventral rays are close together and 

 parallel, their tips curving anteriorly; the medio-lateral ray is com- 

 paratively straight, the postero-lateral and dorso-lateral rays di- 



