232 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



of deepened color. Vulva ventral, slightly salient, near middle of 

 body. Ovejector short, directed posteriorly; uteri divergent. Eggs 

 thick-shelled, embryonated when oviposited. Caudal alae of male 

 hyaline, outspread during life. Nine pairs of pedunculated papillae, 

 4 of them preanal and 5 postanal. Spicules very unequal. 



Parasitic between the tunics of the gizzard of birds. 



Type-species. — Chevreuxia revoluta (Kudolphi, 1819) Seurat, 

 1918c. 



CHEVREUXIA REVOLUTA (Kudolphi, 1819) Seurat, 1918c 



Synonyms. — Spiroptera revoluta Rudolphi, 1819; Dispharagus 

 revolutus (Rudolphi, 1819) Molin, I860. 



Hosts. — Primary: Gharadrius himantopus, Himantopus himan- 

 topus, H. melanopterus ; secondary : Unknown. 



Location. — Between tunics of the gizzard. 



Morphology. — Chevreuxia (p. 231) : Characters of the genus. 



Fig. 20-5. — Chevreuxia revoluta. Anterior end. After Seurat, 1918 



Male 6.4 mm. long by 140/* wide, straight and colorless. Postcervical 

 papillae relatively farther away from the nerve ring than in the 

 female; they are situated at the margin of the collar which is 420/x 

 from the head end. Tail straight. Caudal alae outspread during 

 life; in specimens killed by heat the tail is coiled in a spiral; the 

 alae are hyaline and are united in front of the caudal extremity. 

 Nine pairs of slender, symmetrical, pedunculated caudal papillae; 

 the 4 pairs of preanal papillae are equidistant; the 5 pairs of 

 postanal papillae are arranged in 2 groups, one group of 3 pairs 

 equidistant behind the cloacal aperture, the other group of 2 pairs 

 near the caudal extremity. Right spicule 95/x long, wide and with 

 obtuse end ; left spicule 750/* long, slender, filiform and pointed. 



Female 13.2 to 18.3 mm. long by 265 /t wide. Tail 170/* long, 

 digitiform. Postcervical papillae hidden under the collar at its 

 anterior third and visible through the collar (fig. 295). Posterior 



