NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB ^"J 



probably phylogenetic significance to note that in an occasional speci- 

 men of P. hesperomys the lateral lobe bears a minute but unmistakable 

 bristle. 



In Peromyscopsylla, the armature of the sclerotized inner tube 

 (A.I.T.) is represented as a rule by a median dorsal spur or thicken- 

 ing, as in P. hesperomys (fig. 104), hamifer (fig. 117), osHsibirica 

 longiloha (fig. 119), bidentata (fig. 120), draco (fig. 108), silvatica 

 (fig. 113), scotti (fig, 107), and selenis (fig. 114). This spur is not 

 developed in P. tikhomirovae (fig. 121). However in P. hinialaica 

 (fig. 115), the dorsal armature is basally expanded and also includes 

 a median and a long subapical spur. P. catatina (fig. 112) likewise 

 possesses a conspicuous subapical A.I.T. The lateral armature of the 

 sclerotized inner tube {L.S.I.) is undeveloped, except in P. hamifer 

 (fig. 117), ostsibirica longiloba (fig. 119), and bidentata (fig. 120), 

 where it is produced into a stout keel, especially in the first two. 



The dorsal margin of the apex of the sclerotized inner tube (A.S.I.) 

 is upturned in P. hesperomys (fig. 104), tikhomirovae (fig. 121), 

 scotti (fig. 107), and ebrighti (fig. no). 



P. himalaica seems unique in the possession of a well-developed 

 proximal spur (fig. 115, P.S.). 



The aedeagus of the hamifer group {P. h. hamifer, h. cuneata ssp. 

 nov., h. vigens, ostsibirica longiloba, and bidentata) is characterized 

 by a keellike L.S.I. , large spicules or microverrucae, a huge end 

 chamber, and very large distolateral lobes which are subdivided into 

 two portions. 



EXPLANATION OF SYMBOLS ON FIGURES 



crescent sclerite of aedeagus 

 central thickening of disto- 

 lateral lobe of aedeagus 

 dorsal anal lobe of proctiger 

 distal arm of ninth sternum 

 dorsal intramural rod of 



aedeagus 

 distolateral lobe of aedeagus 

 ductus obturatus 

 dorsal sclerite of apodemal 



strut 

 eighth sternum 

 eighth tergum 

 movable finger or digitoid of 



clasper 

 fulcrum of distolateral lobe 

 of aedeagus 



