408 THE ZOOLOGIST. 



of the finger bears a fairly stout bristle at the posterior angle, 

 and on both sides a small one almost in the centre. The ninth 

 sternite is distally so obscured that the apical portion of the 

 ventral arm cannot be made out clearly in specimens (ix. st.). 



? . The seventh sternite (PL III., figs. 3, 4, vn. st.) resembles 

 that of the previous species, but the lobe above the sinus is 

 sometimes shorter and more rounded. The eighth tergite has 

 sixteen to eighteen bristles, inclusive of the apical ones. The 

 proportional width and length of the stylet are 1 : 2.6. The 

 head of the receptaculum seminis is slightly longer and narrower 

 than in the previous species, but this is possibly due to the 

 organ not being in exactly the same position in the specimens 

 examined. 



In certa and contigua the bristles of the second antennal seg- 

 ment of the female are less than one-fourth as long as the club. 



Three males and five females from near Djarkent, Semi- 

 tchenskoi, East Turkestan, February 11th and November 15th, 

 1912, off Meriones tamaricinus, collected by W. Riickbeil. 



Explanation of Plates II. & III. 



Fig. 1. — Clasping organs of male of Amphipsylla contigua : viii. t., eighth 

 tergite; viii. st., eighth sternite ; Cl.,clasper; P, process of same; 

 F, movable process ; M, manubrium ; rx. st., ninth sternite. 



,, 2. — Clasping organs of male of Amphipsylla certa. 



,, 3. — Seventh (vn. st.) and eighth (viii. t. and viii. st.) abdominal 

 segments of female of Amphipsylla certa. 



,, 4. — Seventh abdominal sternite of another female of Amphipsylla 

 certa. 



,. 5.— Receptaculum seminis of Amphipsylla contigua, subventral view. 



,, 6.— The same of another specimen, lateral view. 



,, 7. — The same of Amphipsylla thoracicus (type). 



,, 8. — Seventh (vn. st.) and eighth (viii. t. and viii. st.) abdominal seg- 

 ments of Amphipsylla thoracicus (paratype). 



