14 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



extending 78 to 85/a from the end of body. Mouth with a slight dis- 

 tinct chitinous armature. Excretory pore 26G> from head end. 

 Esophagus short, 350 to 450> long, slightly dilated posteriorly. 



Male 9 to 10 mm. long by 110/x wide. Prebursal papillae quite dis- 

 tinct. Bursa (fig. 8) trilobed and large. Ventral rays close to- 

 gether and directed anteriorly; externo-lateral ray remote from 

 ventrals, but directed anteriorly; medio-lateral and postero-lateral 

 rays directed posteriorly; externo-dorsal ray more slender than 

 laterals but almost as long; dorsal ray orginates in a short common 

 trunk with externo-dorsals, bifurcates distally for two-thirds its 

 length, these primary branches in turn bifurcating, the resultant 

 external secondary branches being longer than the internal and 

 recurved in such a manner that their tips are anterior to those of 

 the internal secondary branches, which have bifid extremities; the 

 primary branches have also a short external branch near the proximal 

 extremity of each. Spicules equal, trifurcated distally, 285/x long. 

 Telamon elongated, with a transverse process on each side directed 

 ventrally in the lateral walls of the cloaca, the body of the telamon 

 64 to 71//. long by 21/* wide. 



Female 17 to 20 mm. long by 150/* wide. Vulva in the posterior 

 half of the body ; vagina short ; ovejector slightly developed. Anus 

 250 to 284/x from tip to tail. Tail terminates in a very fine spine- 

 like point 21 to 22/* long. Eggs 71/x by 42/*, segmenting in uterus. 



Life history. — Unknown; probably simple and direct. 



Distribution. — South America (Brazil). 



ORNITHOSTRONGYLUS DOUGLASI (Cobbold, 1882, emend. Gedoelst, 1911) 

 Travassos, 1920a 



Synonyms. — Strongylus douglmsii Cobbold, 1882; Strongylus 

 douglasi (Cobbold, 1882, emend. Gedoelst, 1911) Gedoelst, 1911; 

 Trichostrongylus douglasi (Cobbold, 1882, emend. Gedoelst, 1911) 

 Theiler and Robertson, 1915. 



Host. — Strut Mo camelus. 



Location. — Proventriculus. 



Monphology. — Ornithostrongylus (p. 11) : Body slender, tapering 

 slightly and suddenly in the cervical region. Worms yellowish red 

 by reflected light and rather colorless by transmitted light. Trans- 

 verse striations especially evident in mid-body. Head 20 to 27/i 

 in diameter. Mouth with 3 small lips, each having a small pro- 

 tuberance; the mouth aperture triradiate. Four submedian papillae 

 and 2 lateral structures, either lateral papillae or amphids, in shallow 

 grooves. Esophagus filariform, 480 to 500/* long. Excretory pore 

 about 300/i behind head end. 



Male length averages 4.65 mm. ; width about 93 to 95/«,. Posterior 

 portion of body slightly twisted longitudinally and tail end slightly 



