NEMATODE PARASITES OF BIRDS 



201 



Morphology. — Third stage larva (fig. 272) : 13.1 mm. long by 

 410> wide; tail 158//, long. Precervical papillae 77/x from cephalic 

 end; buccal cavity 60/*, muscular esophagus 440/*, glandular esopha- 

 gus 4.3 mm. long. 



Distribution. — Africa (Algeria). 



This larva had apparently encysted in an aberrant host. Since 

 the adult is probably a bird form, the above description is included 

 here. 



Genus VIGUIERA Seurat, 1913b 



Generic diagnosis. — Spirurinae (p. 164) : Body suddenly narrowed 

 in anterior region. Cephalic extremity covered by a circular disk 

 which projects slightly from the underlying part; posterior to this 

 compression, 2 papillae. Buccal cavity cylindrical, with thick walls, 



Fig. 272. — Hartertia zorillab. Third stage larva. «, Lateral view of head; 

 &, ventral view of head ; c, ventral ; d, lateral view of tail. After Seurat, 

 1919 



30 to 50//. long. No lateral alae. Two precervical papillae situated 

 far anterior to the nerve ring. Male with caudal extremity rolled 

 in spiral; bursal alae asymmetrical; 9 preanal papillae (Seurat says 

 9 pairs but figures them as single in the type-species) on the left 

 side, 7 on the right side ; 2 pairs of postanal papillae. Spicules very 

 unequal. No gorgeret. Female with vulva in posterior region of 

 body, near anus. 



Parasitic in proventriculus of birds. 



Type-species. — Viguiera eun/optera (Rudolphi, 1819) Seurat, 

 1913. 



VIGUIERA EURYOPTERA (Rudolphi, 1979) Seurat, 1913b 



Synonym,. — Spiroptera eumjoptera Rudolphi, 1819. 



Host. — Primary: Lanius collurio, L. excubitor, L. minor, L. rufus; 

 also " pie-grieche a tete rouge " ; secondary : Unknown. 



Location. — Proventriculus. 



Morphology. — Viguiera (p. 201) : Cuticle thick, transversely stri- 

 ated. Muscular esophagus very slender, surrounded toward its 

 posterior third by the nerve ring, posterior to which is situated the 

 excretory pore. 



