644 MR, B. f. CUMMIXGS ON LICE 



parts, fresh material was not available ; but it was found that 

 good results may be obtained with well-preserved spirit material 

 if the specimens be plunged for a few minutes in caustic potash, 

 to destroy the connective tissue, and then soaked for twelve hours 

 in glacial acetic acid, transferred to absolute alcohol, dissected in 

 oil of cloves, and mounted in Canada balsam. 



For sectioning, the specimens had been fixed in Carnoy's 

 solution (Formula No. II.), wliich proved, however, to be not 

 very satisfactory. For imbedding, Awati's methods, detailed in 

 the P. Z. S. for 1914 (p. 686), were followed, the sections being 

 stained in the ordinary way with Ehrlich's Hsematoxylin, Eosin, 

 or Orange G. I am much indebted to Mr. C. A. Gunns for 

 assistance in section-cutting. 



[In none of the figures which follow of the male reproductive 

 system and copulatory apparatus are the muscles shown, and in 

 some the exact position of the entry of the vas deferens into the 

 ductus is not given because, as a rule, in most of the dissections 

 this could only be made ovit with the greatest difficulty on account 

 of the delicacy of the vas deferens.^ 



Family Phjlopterid^. 

 The Owl Philopteri. 



Piaget (3) grouped the Owl Philopteri together, under the 

 general name " Strigicolse." For convenience, this plan may 

 still be followed. But these Owl parasites cannot very easily be 

 separated o& as generically distinct from the Philopteri of Birds 

 of Prey, with which they show certain affinities. Within them- 

 selves they fall into three distinct types, as pointed out by 

 Prof. V. L. Kellogg (4), represented by the following three 

 species : — P. rostratus Nitzsch, P. cehlehrachys Nitzsch, and 

 P. cursor Nitzsch. 



The following four species were included in the collection : — 



Philopterus rostratus Nitzsch (5, p. 76). 

 4 $ 5 , from the Barn-Owl, Flaimneajlammea (Linn.)*. 

 Dissections were made from male material kindly handed over 

 to me by Mr. Waterston. 



Philopterus cursor Nitzsch (5, p. 75). 



Several specimens of both sexes, from Bubo mactdosics (Vieill.) 

 (S. Africa) and £. asccdaphus (Savign.) (Egypt). P. cursor has 

 been further recorded from B. capensis Smith, B. virginianus 

 (Gmel.), Asio accipitrinus, A. loilsonianus (Less.), and A. gcdapa- 

 ge7isis (Gould). 



* [The parentheses avoimd the names of authors placed after scieiititic names in 

 this paper are used in accordance with Article 23 of tlie International Rules of 

 Nomenclature (Proc. 7th Int. Cong. Boston, 1907, p. 44 (1912}). — Editok.] 



