NEMATODE PARASITES OF BIRDS 383 



Jaegerskiold considers it doubtful that the larva which Linstow 

 had was the same species as the adult described by Wedl. He says 

 that in several respects Linstow's form resembles H. varispirwsus 

 more closely than it does Wedl's species. 



ADDENDA 



Since the present paper has been in press there have appeared 

 several notable contributions to the study of nematodes parasitic in 

 birds, of which brief mention should be included here. 



The following new species or redescriptions of former species have 

 been published : 



AMIDOSTOMUM SKRJABINI Bouleneer. 1926 



Boulenger 12 described as a new species an amidostome found in 

 Anser albifrons in Egypt. This species appears to be identical with 

 Amidostomum chevreuxi Seurat, 1918, Boulenger apparently over- 

 looking Seurat's species. The only differences to be noted in the 

 two descriptions refer to the swelling at the posterior end of the 

 esophagus; Seurat says there is such a swelling or bulb, which, 

 however, is of the same width as the part of the esophagus anterior 

 to it, and thus is not differentiated externally; in A. skrjabini, Bou- 

 lenger says that the swelling is absent. 



Genus PSEUDAMIDOSTOMUM Boulenger, 1926 



Boulenger 13 has made a new genus based on three female speci- 

 mens of nematodes found along with specimens of Amidostomum 

 raillieti in Fulica atra, the head structures of these three nematodes 

 being especially different from those in Amidostomum. Boulenger 

 gave no diagnosis for his new genus but, based on the type species, 

 the generic diagnosis may be given as follows: Head with cuticle 

 slightly expanded in form of mouth collar and with four conspicu- 

 ous submedian papillae. Buccal capsule broad and very short, with- 

 out teeth. Vulva posterior to middle of body; diameter of body 

 sharply diminished posterior to anus. 



Type species. — Pseudamidostomum loosi Boulenger, 1926. 



PSEUDAMIDOSTOMUM LOOSI Bouleneer, 1926 



Boulenger 14 describes this species from stomach wall of Fulica 

 atra; Egypt. 



Females only, 7.3 to 7.8 mm. long by 16(V to 17G> wide. Cuticle 

 of head slightly expanded; four conspicuous submedian papillae; 



15 1026 : Parasitology, Cambridge, Eng., vol. 18, pp. 94-06, figs. 18-22. 



13 Idem, pp. 05-97. 



M Idem, p. 06, figs. 23-25. 



