228 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loi 



EUHAEMOGAMASUS AMBULANS (Thorell) 



Figures 41, 46 



Dermanyssus ambtilans Thorell, Ofv. Vet.-Akad. Forh., vol. 2, p. 164, 1872. 

 Qamasus ovalis Koch, Kongl. Svenska Vet.-Akad. Handl., vol. 16, No. 5, pp. 121- 



122, table 5, figs. S-Sa, 1878. 

 Haemogamasus nidi Michael, Trans. Linn. Soc. London, vol. 5, pp. 314-315, 



pi. 32, figs. 6, 7, 1892.— Hirst, Bull. Ent. Res., vol. 5, pp. 121-122, 1914.— 



ViTZTHUM, Zool. Jahrb. ( Abt. Syst.) , vol. 60, p. 401, 1931. 

 Laelaps ovalis (Koch) Tragardh, Zool. Anz., vol. 25, p. 61, 1902. 

 Haemogamasus michaeli Oudemans, Tijdschr. Nederl. Dierkiind. Ver., ser. 2, 



vol. 8, pp. 87-88, 1903; Arch. Naturg., vol. 79, Abt. A, Heft 8, pp. 155-160, 



figs. 108-140, 1913. 

 Eypoaspis ambulans (Thorell) Tragardh, Fauna Arctica, vol. 4, Lief. 1, p. 33, 



figs. 55-58, 1904. 

 Eulaelaps ambulans (Thorell) Tragardh, Nat. Unter. Sarekgebirges Swed. Lap., 



vol. 4, Lief. 4, pp. 435-437, figs. 116-122, 1910. 

 Haemogamasus reidi Ewing, Proc. Biol. Soc. Washington, vol. 38, p. 140, 1925. 

 Haemogamasus twitchelU Ewing, Proc. Biol. Soc. "Washington, vol. 38, pp. 142-143, 



1925.— ViTZTHUM, Zool. Jahrb. (Abt. Syst.), vol. 60, p. 401, 1931. 

 Euliaemogamasus onychomydis Ewing, Proc. U. S. Nat. Mus., vol. 82, art. 30, 



p. 4, pi. 1, fig. 3, 1933. 

 Euhaemogatnasus sciuropteri Keegan, Trans. Amer. Micr. Soc, vol. 65, No. 1, 



p. 72, figs. 8-9, 1946. 



Female. — Described from European specimens. Dorsal shield does 

 not entirely cover dorsal surface ; widest at level of coxae III. Usual 

 pair of apical setae clearly largest on shield. Setae sparser in apical 

 region but over remainder of shield between 9/a and 12jli apart laterally 

 and 9jLi to 20/x apart anteroposteriorly. They average about 35/1, in 

 length but may be larger in apical region and at posterior margin. 

 Usual pair of apical setae and many of the other setae on shield 

 barbed. Five pairs of pores on shield. Dorsal body setae larger and 

 not so closely set as setae on shield, nearly all barbed, larger at pos- 

 terior body margin. On one specimen a terminal pair is larger, but 

 not so stout, as usual apical setae. Lacinae and base of tritosternum 

 barbed. Presternal area sculptured; sutures with spines. Sternal 

 shield about one a half times as wide as long; posterior margin of 

 shield slightly invaginated. Only anterior pair of sternal setae barbed. 

 Anterior pair of sternal pores nearly parallel with anterior margin 

 of shield. Genitoventral shield flask-shaped, varying somewhat in 

 size and outline. Accessory setae numbered 70-85 in all European 

 specimens examined ; usual pair of genitoventral setae anterior to all 

 accessory setae and larger than the latter; more anterior accessory 

 setae larger. All setae on shield smooth. Length- width ratio of anal 

 shield about 1.5 : 1. Usual anal setae and five smaller accessory setae 

 present on all specimens examined. Posterior unpaired usual setae 

 largest on shield, sometimes with a few barbs. Setae smaller than 

 adjacent ventral body setae. Endopodal shields slender. Metapodal 



