MITES OF SUBFAMILY HAEMOGAMAStNAE — KEEGAN 253 



College Park, Md., April 13 and 14, 1932, May 9, 1929, June 14, 1933; 

 Chevy Chase, Md., June 7, 1932 ; Cabin John, Md., June 2, 1932 ; Burnt 

 Mills, Md., March 24 and 29, 1932. "Albemarle meadow mouse," 

 Petersburg, Va., April 6, 1933. "Meadow mouse," Somerset, Md., 

 January 27, 1934. "Mouse nest," Great Falls, Va., December 26, 1926. 

 "Short-tailed shrew," Kiverdale, Md., May 27. 1934. 



Types.— Two females (U.S.N.M. No. 950), from "nest of small 

 mammal" from Maryland shore of Potomac River, near Plummers 

 Island. 



EUHAEMOGAMASUS QUADRISETATUS (Vitzthum) 

 FlGITBE 55, &, C 



Eaemogamasus qtcadrisetatus Vitzthum, Treubia, vol. 8, pp. 52-56, figs. 35-36, 

 1926; Zool. Jahrb. (Abt. Syst.), vol. 60, p. 400, 1931. 



No specimens of this mite were available for study. The following 

 data are taken from Vitzthum's paper. 



Female. — Dorsal shield leaves much of posterior portion of dorsal 

 surface unprotected. Almost all setae of entire animal barbed, but 

 some on dorsal shield may be smooth. Dorsal body setae are larger 

 at posterior body margin, where four of them are outstanding in 

 length, being almost half as long as body of mite. Tritosternum 

 barbed. Presternal area not mentioned or figured clearly. Sternal 

 shield rectangular, with a nearly straight posterior margin ; no indi- 

 cation is given whether sternal setae are barbed or smooth. Genito- 

 ventral shield flask-shaped, with the usual pair of genitoventral setae 

 and about 30 accessory setae. About five accessory setae on anal shield. 

 Peritreme not figured clearly. Endopodal shields not figured clearly. 

 Metapodal shields small and in usual position. Metasternal setae 

 about as large as those on sternal shield. Ventral body setae not so 

 numerous as those on dorsal surface and larger than the latter. Fixed 

 chela distally bent like a pointed hook ; with a spoonlike excavation 

 and a tiny tooth, which may actually be a pilus dentilis. Legs are not 

 figured, but Vitzthum reports that the only smooth setae on them are 

 those on tarsus I and on distal ends of other tarsi. 



Size. — Length of female is given as 1,130/x. 



Remarks. — Distinctive features seem to be : Almost all setae barbed ; 

 two pairs of greatly enlarged posterior body setae, each of these almost 

 half as long as body ; sternal shield with an almost straight posterior 

 margin; genitoventral shield with about straight posterior margin; 

 genitoventral shield with about 30 accessory setae; anal shield with. 

 6 or 6 accessory setae; chelae toothless. 



Distribution and host. — Taken only from Mus Upturns, Java. 



Male and nymph. — Unknown. 



