180 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Gendre's (1922) specimens from Milvus korschum conform to 

 Seurat's description of this species except that they are smaller in 

 size, the lateral alae are unequal, and one spicule length is differ- 

 ent, the left spicule measuring 870 to 930/i in length. 



HABRONEMA MONOPTERA Gendre, 1922 



Host. — Primary: ". Rapace nocturne"; secondary: Unknown. 



Location. — Proventriculus. 



Morphology. — Habronema (p. 172) : Body slender anteriorly, 

 thickened posteriorly. One lateral ala (fig. 251 a) , situated in cephalic 

 region on left side, originating 250 to 280/* from the anterior extrem- 



3Q0JJ . 



Fig. 250. — Habronema mansioni. a, Anterior end, vertical view : 

 tail ; c, ovejectou. After Seurat, 1914 



h, male 



ity and extending to the level of the termination of the glandular 

 esophagus, its greatest width 18 to 22/*. Cervical papillae in inverse 

 position from those of H. tulosto?na, the right one being anterior to 

 the left. Head (fig. 251 b and c) with 4 lips, the laterals trilobed, 

 rounded and flattened, with 4 long teeth on the inner surface of the 

 median lobe ; dorsal and ventral lip with central triangular tooth and 

 2 lateral semiglobular lobes, each bearing a large papilla. 



Male 7.6 to 9.8 mm. long by 300 to 350/x wide. Lateral ala about 

 2.58 mm. long. Tail (fig. 251 d) 230 to 260/x long. Caudal alae long, 

 lanceolate, thick, each ala consisting of 2 folds. External or dorsal 

 surface of alae transversely striated;. internal surface covered with 

 longitudinal, parallel ribs and shields, which cover the ventral sur- 



