56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I23 



Ctenopsylla hidcntata Wagner, Akad. Nauk S.S.S.R. Zool. Inst., Parazitol. 



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



pi. 13, fig. 94, 1930- 

 Leptopsylla bidcntatits Jordan, Nov. Zool., vol. 36, p. 230, 1931 ; vol. 38, p. 257, 



1932. 

 Ctenopsyllus bidcntahis V/agner, Tierwelt Mitteleuropas, vol. 6, Abt. 17, p. 16, 



1936. 

 Peromyscopsylla bidcnfatus Hopkins and Rothschild, in MS. 



Head, thorax, and abdomen. — As in hamifer. 



Male. — As h. hamifer except in the following points : manubrium 

 very narrow, acuminate; immovable process of clasper (fig. 87, P.) 

 with very narrowly rounded apex ; triangular in shape, with dorsal and 

 posterior margins forming longest sides of triangle; characteristic 

 bristle on posterior margin a little longer than greatest width of 

 movable finger, set well above midpoint. Movable finger or digitoid 

 of clasper (F.) elongate and narrow, gradually broadening from near 

 base to apex ; crescentic, five times as long as wide at maxima ; poste- 

 rior margin with three long bristles, two of these near apex, third 

 considerably lower, but above midpoint; anteromarginal bristles 

 shorter than is usual in the genus. The four long bristles of sternum 

 8 (fig. 89) as in h. hamifer. Distal arm of ninth sternum (fig. 90) 

 much as in h. hamifer but with clump of short, stout apical bristles. 



Aedeagus (fig. 120). — Of the hamifer type with respect to the keel- 

 like lateral sclerotization of inner tube {L.S.I.) ; the spicules or micro- 

 verrucae on the lateral lobes (L.L.) ; the huge size of the end chamber 

 and of the distolateral lobes (DL.L.) ; and the distolateral lobes being 

 subdivided into two portions, a relatively weakly sclerotized portion 

 and a more apical, lateral, more heavily sclerotized region. Crochets 

 (CR.) short, broad at base and resembling a somewhat twisted tri- 

 angle. Microverrucae or spicules on lateral lobes large and scalelike ; 

 limited to a band at apex of crochet. Apicolateral portion of DL.L. 

 larger than unspecialized proximal portion. Lateral sclerotization of 

 inner tube (L.S.L) prominent but scarcely broader than S.LT. Apex 

 of sclerotized inner tube (A.S.L) not expanded. 



Female. — Spermatheca (fig. 88, SP.) as in hesperomys. Seventh 

 sternum (fig. 88) with long, narrow lobe followed ventrally by deep, 

 evenly rounded sinus. No row of bristles on eighth tergum, above 

 spiracle. Anal stylet about four times as long as broad ; bearing one 

 long apical and two shorter subapical bristles. 



Type. — From Sciurus vulgaris. 



The range of bidentata is Europe, and apparently western Asia to 

 Siberia. 



