MITES OF SUBFAMILY HAEMOGAMASINAE — ^KEEGAN 235 



Kenwood, Ontario, November 22, 1921. "Townsend mole," Clacka- 

 mas County, Oreg., May 30, 1932. "In squirrel hole," Urbana, 111., 

 March 31, 1944. "Eaccoon," Bowie, Md., November 2, 1943. "Cot- 

 tontail rabbit," Allegan, Mich., April 1, 1937. "Bobwhite," Halifax, 

 N. C, January 17, 1933. "In chicken nest," Astoria, Oreg., Septem- 

 ber 8, 1937. 



EUHAEMOGAMASUS HORRIDUS (Michael) 



FiGUEE 47 



Haemogamasus horridus Michael, Trans. Liiin. Soc. London, vol. 5, pp. 312-313, 

 pi. 32, figs. 1-5, 1892.— OUDEMANS, Arch. Naturg., vol. 79, Abt. A, Heft 8, pp. 

 146-155, figs. 98-107, table 11, figs. 11-15, 1913.— Hirst, Journ. Zool. Res., 

 vol. 1, pp. 60-61, 1916.— ViTZTHUM, Zool. Jahrb. (Abt. Syst.), vol. 60, pp. 

 402^03, 1931. 



Haemogamasus horridus var. arvicolarum Beblese, Redia, vol. 14, p. 166, 1920. 



Haemogamasus arvicolarum (Berlese) Turk, Ann. Mag. Nat. Hist., ser. 2, vol. 12, 

 pp. 78.5-820, figs. 119-122, 1945. 



Female. — Setae of dorsal shield about 15;u, apart and of nearly uni- 

 form size, varying between 40/x and 60/* in length ; usual apical setae 

 clearly the largest setae on shield. Setae of apical region little larger 

 than others ; all setae on shield smooth ; five pairs of pores on shield. 

 Setae of unprotected dorsal integument larger than those of shield, 

 particularly at lateral and posterior body margins, where some may be 

 barbed ; three or four terminal pairs distinctly larger than other mar- 

 ginal setae. Lacinae of tritosternum barbed ; a spine on each side of 

 base of tritosternum about midway on its length. Presternal area 

 sculptured and applied to entire anterior margin of sternal shield; 

 sutures of presternal area with tiny spines. Sternal shield strongly 

 sculptured ; slightly longer than wide, with a nearly straight posterior 

 margin ; all sternal setae large, stout, and smooth ; anterior flank middle 

 third of anterior margin of shield. Anterior pair of sternal pores 

 posterior and slightly lateral to bases of anterior pair of sternal 

 setae; a few anterior sutures of shield with tiny spines; anterior 

 and posterior pairs of seta about equidistant from middle pair. Geni- 

 toventral shield strongly sculptured; with a nearl}^ straight posterior 

 margin in some specimens; usual pair of genitoventral setae smooth 

 and smaller than sternal and metasternal setae ; accessory setae smaller, 

 smooth and present over most of shield posterior to usual setae ; in five 

 available specimens accessory setae number 35, 60, 65, 65, and 70. Anal 

 shield between one and a half and two times as long as it is wide ; in 

 addition to the three usual anal setae about 10 smaller accessory setae 

 are present; of five available specimens, two possess 10 accessory setae 

 and three 11 ; pattern of setation of accessory setae variable ; posterior 

 usual seta is largest on shield. Endopodal shields short. Metapodal 

 shields rodlike. Shape of posterior end of peritreme distinctive ; tubu- 

 lar portion extends to level of anterior margin of coxae III. Ventral 



886346 — 51 5 



