DESCRIPTIONS AND DETERMINATIONS OF SPECIES 



49 



Antarctophthirus trichechi (Boh). 

 Plate III, fig. i ; text fig. 17, B. 



Haematopinus trichechi Boheman, Vetensk Akad. Forhandl. (Kopenhagen) 12, p. 



577, pl. 35, fig. II, Ilaand II, (1865). 

 Antarctophthirus trichechi Enderlein, Deutsche Siidpolar Exped., vol. 10, pt. 4, pp. 



505, 512-513, pis. 55-56, (1909). 

 Arctophtirus trichechi Mjoberg, Arkiv. for Zoologi, vol. 6, no. 13, pp. 177-180, 



(1910). 



We have several specimens of this species, both males and females, 

 taken from a "Pacific walrus" (northeast of Siberia) sent us by Profes- 

 sor Van Dyke of the University of California. 



Fig. 17. — A, Antarctophthirus monachus n. sp., scales from abdomen. 

 B, Antarctophthirus trichechi (Boh.) ; scales from abdomen. 



Antarctophthirus monachus n. sp. 

 Plate III, fig. 4; text fig. 17, \A, and text fig. 18. 



Among the material sent us by Professor Osborn are three speci- 

 mens, two males and a female, of an undescribed species which we are 

 referring to Antarctophthirus. The locality and exact host of the species 

 are unknown, the specimens being labelled merely "On seal ( ?)." The 

 species differs quite markedly from the others of the genus, being slen- 

 derer and much more spiny. 



Description of the Female. — Total length 2.5 mm., length of 

 head .5 mm., length of abdomen 1.6 mm., width of head .4 mm., width 

 of thorax .5 mm., width of abdomen approximately 1 mm. 



Head short and broad, the anterior margin slightly convex, the tern- 



