NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB 4I 



PEROMYSCOPSYLLA SILVATICA FALLAX (Rothschild, 1909) 

 Figures 68-70 



Ctenopsyllus jallax Rothschild, Ent. Month. Mag., vol. 45, p. 185, pl. 2, fig. i, 



1909. 

 Leptopsylla jallax Jordan and Rothschild, Ectoparasites, vol. i, p. 113, 1920. 

 Leptopsylla jallax Jordan and Rothschild, Ectoparasites, vol. i, p. 289, 1923- 

 Ctenopsylla jallax Wagner, Akad. Nauk S.S.S.R. Zool. Inst., Parazitol. Sbornik 



(Mag. Parasitol. Mus. Zool. Acad. Sci.), Leningrad, vol. i, p. 148, pl. I3, 



figs. 92, 93, 1930. 

 Leptopsylla jallax Jordan, Nov. Zool., vol. 36, pp. 227, 231, 1931 ; vol. 38, p. 257, 



1932. 

 Ctenopsyllus jallax Wagner, Tierwelt Mitteleuropas, vol. 6, Abt. 17, P- lOf 



fig. 60, 1936; Bronn's Kl. Ordnung. Tierreichs, vol. 5, Abt. 3, Buch 13, 



Teil f, figs. 19 (p. 19), 86 (p. 85). 

 Peromyscopsylla silvatica jallax Hopkins, Journ. Washington Acad. Sci., vol. 



42, No. II, p. 364, 1952. 



Head, thorax, and abdomen. — As in s. silvatica. Differs from other 

 members of the species in details of the modified segments of the male. 

 Digitoid or movable finger of clasper (fig. 68, F.) with rounded poste- 

 rior margin, widest at dorsal portion ; dorsal margin somewhat con- 

 vex ; three long bristles at posterodorsal angle, several small bristles on 

 dorsal and posterior margins ; lower half with numerous small mesal 

 bristles. Eighth sternum (fig. 69) with dorsal fold subapical and 

 short ; posterior margin straight ; ventral margin gently concave to 

 near insertion of two short, very stout ventral bristles; one short 

 dorsomarginal bristle and two long subapical bristles. Distal arm of 

 ninth sternum (fig. 70) with strongly rounded, upswept, posterior 

 (ventral) margin; apex acute; anterior (dorsal) margin nearly 

 straight; relatively quite broad subapically ; a few short apical and 

 subapical marginal bristles; posterior (ventral) margin with two to 

 three medium-sized bristles proximal to upswing, and basally with a 

 few smaller bristles ; laterally, apical half with several small bristles. 

 Details of female modified segments indistinguishable from s. silvatica. 



Type. — From Microtus arvalis Campfer, Upper Engadine, Switzer- 

 land. 



The range of this subspecies is the European Alps. 



Records of Specimens Examined 



Female from Apodemiis sylvaticus, pine tree in Charrade, France, Sept. 13, 

 1935, M. Rothschild. Male from Clethrionomys (= Evotomys) glareolus, S[an]. 

 Martini, Dolomites, Italy, Sept. 15, 1930, K. Jordan. 



