DESCRIPTIONS AND DETERMINATIONS OF SPECIES 



17 



Fig. 3. — Hoplopleura acanthopus var. amerieanus n. var. ; pleural plates and head 



of female. 



Hoplopleura hesperomydis (Osborn). 

 Plate I, fig. 3 ; plate IV, fig. 1 ; plate V, fig. 14; text figs. 4 and 5. 



Haematopinus hesperomydis Osborn, Bui. 7, o. s., U. S. Dept. Agr., Div. Ent., 26, 

 fig. 14, (1891) ; Bui. 5, n. s., U. S. Dept. Agr., Div. Ent.. pp. 184-185, fig. 108, 

 (1896). 



Polyplax (?) hesperomydis Enderlein, Zool. Anz., vol. 28, p. 143, (1904). 



Polyplax (?) hesperomydis Dalla Torre, Genera Insect., Anoplura, p. 13, (1908). 



Numerous males and females from several individuals of Peromys- 

 cus maniculatus rubidus (Gualala, Mendocino county, Calif.) ; Peromys- 

 cus maniculatus gambeli (Covelo and South Yolla Bolly Mt., Tehama 

 county, Calif.). Comparison of these specimens with Osborn's types 

 shows them to belong unquestionably to this species. The specimens in 

 the Osborn collection were taken from Peromyscus leucopus (Ames, 

 Iowa). 



H. hesperomydis seems to be closest to H. acanthopus, but differs 

 from the latter in several well marked particulars. The sternal plate is 

 smaller, more angular and more pointed posteriorly, the head is much 

 more pointed posteriorly, and the pleural plates are quite different. 



