NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB 3 



Legs. — All tibiae with dorsomarginal comb of short, stout, black 

 bristles (fig. 2). Femora with dorsomarginal row of small, evenly 

 spaced, very short, sharply pointed bristles, giving a serrate appear- 

 ance. Fifth segment of each tarsus with four lateral plantar bristles 

 and basal submedian pair. 



Abdomen. — Unmodified abdominal terga typically with two rows of 

 bristles ; in some cases anterior row represented by one bristle or 

 entirely absent on some specimens. Terga one to six with apical 

 spinelets. 



Male. — Eighth sternum usually associated with a mesal membra- 

 nous nonapical process of varying length (fig. 78, M.P.). Manubrium 

 long and acuminate. Digitoid or movable finger of clasper with three 

 or four long, rather heavy marginal bristles. 



Aedeagiis. — Aedeagal apodeme (figs. 7, 94, AE.A.) about four to 

 seven times as long as broad and about three to five times as long as 

 portion distad of apodemal strut. Median dorsal lobe (fig. 104, 

 M.D.L.) typically weakly sclerotized. With a distinctive and generally 

 conspicuous movable pair of subdorsal lobes, herein designated as 

 distolateral lobes (DL.L.), lying apical and lateral to sclerotized inner 

 tube (S.I.T.). Distolateral lobes articulated with S.I.T. by means 

 of a sclerite we are terming the fulcrum (FM.) ; also connected with 

 the fairly well-developed lateral lobes (L.L.). In certain species the 

 distolateral lobes bear a heavily sclerotized median area which is at 

 times circular in appearance, the central thickening (C.TH.). Sclero- 

 tized inner tube (S.I.T.) short, oblique in undisturbed position, with 

 armature (A.I.T.) usually limited to a short dorsal spur; its apex 

 (A.S.I.) at times with a short dorsal expansion ; its lateral sclerotiza- 

 tion {L.S.I. ) usually unspecialized, although at times produced into 

 a definite keel (fig. 117). Band of inner tube (B.I.T.) usually ap- 

 parent. Crochets (CR.) typically represented at least by a long 

 daggerlike or sagittate sclerotized projection; at times well developed 

 and suggesting Leptopsylla Jordan and Rothschild, 191 1 (fig. 121). 

 Penis rods (fig. 7, P.R.) uncoiled. Proximal spur (fig. 115, P.S.) 

 usually absent. Apical appendage very short (fig. 7, AP.A.). Vesicle 

 (F.) at best only indicated. Dorsal (D.I.R.) and ventral (I.R.) intra- 

 mural rods usually fairly well sclerotized. Extensions of lateral plate 

 of apodeme (A.L.L.) variable, at times quite broad. Apodemal strut 

 consisting of the usual sclerites : a relatively long subovate latero- 

 ventral sclerite (L.S.), a median irregular sclerite (M.S.), and a 

 dorsal somewhat convex one (D.S.). Crescent sclerite (C.S.) long, 

 conspicuous. 



