NEMATODE PARASITES OF BIRDS 



177 



rufus, Emberiza pecoris, Falco albicollis, F. ater, F. aurantius, F. 

 bidentatus, F. buteo, F. cachinans, F. cineraceus, F. cyaneus, F. 

 lananits, F. magnirostris, F. nisus, F. palumbarius, F. i-ufus, F. sub- 

 buteo, F. tinnunculus, F. tridentaius, F. xanthothorax, F. unicinctvis, 

 Harpagus bidentatus, Herpetotheres cachinans, Hypotriorchis sub- 

 buteo, MUvus regalis, Strix otus; secondary : Unknown. 



Location. — Proventriculus. 



Morphology. — Habronema (p. 172) : Body elongate, strongly stri- 

 ated. Two lateral alae on anterior 1/4 of body. Cervical papillae 



Fig. 247. 



-IIabuonkma leptoptera. a, Anterior end, dorsal view 

 After Seurat, 1914 



b. male tail. 



far anterior to nerve ring. Head (figs. 217a and 248a) distinctly 

 set off from body. Four lips, the 2 lateral very large, trilobed, with 

 3 large teeth; the dorsal and ventral lips carrying a prominent 

 median crest, and also ! papillae at the point of insertion of these 

 two lips. Muscular esophagus long and slender. 



Male 7.1 mm. long by 720/x wide. Spicules unequal, the left long 

 and slender, 040/* in length ; the right 200//, long. Gorgeret 30//, long. 

 Two caudal alae (fig. 2475) each formed of 2 halves, the dorsal finely 

 striated transversely; the other, with longitudinal striations, is 

 folded over and built upon the preceding, partly hiding the ventral 

 surface of the body. Left ala thickened at edge, the papillae ter- 



