240 



XOVITATES ZOOLOGICAE XXI. IDU. 



palpns consisting of five segments, iu the abdomen bearing no apical spines on any 

 of the segments, and in the clasjier of the t? having a non-movable ventral process. 

 The tarsal and tibial bristles are somewhat shorter than in P. simonsi, at least in 

 the S. We have only one badly preserved ? of P. simonsi, and therefore are not 

 snre whether there are other differences in this sex besides those mentioned below. 



S. The eighth abdominal sternite bears a vertical row of four bristles on each 

 side and two long narrow processes of a pecnliar shape (VIII. st.). The clasper (CI) 

 is very large, angulate dorsally, and rounded apically. It bears about twenty long 

 bristles and a dozen small ones .situated at the proximal portion of the dorsal edge. 

 From the ventral side of the clasper a large process (P') branches oft', shaped some- 

 what like a hockey-stick, being curved upwards at the end. The apex of this 

 process bears four or five spine-like bristles and a number of small hairs, there being 

 also minute hairs at the ventral margin of the clasper proximally to the process. 

 The process (P-) of the right clasper is much broader than that of the left side of 

 the body (?'), this being the first case of conspicuous asymmetry of this kind with 



Fig. 



-ParapsijUus elaviger. 



which we have met among Siphonaptera. The jM-ocesses and their spiniform 

 bristles, moreover, are individually somewhat variable. The movable exopodite F 

 is inserted nearly in the centre of the inner surface of the clasper, and has the shape 

 of a sock with a very short foot, the tip pointing frontad. The inner and outer arms 

 of the ninth sternite are at right angles to each other (text-fig. 1, IX. st.). The outer 

 arm widens distally, its ventral edge being distally strongly rounded and the upper 

 angle pointed. The widened portion bears on the outer surface about seven long 

 bristles and a large cluster of numerous small ones, minute hairs being placed 

 further proximad and the ventral edge also bearing a row of hairs as shown in the 



figure. ?. The seventh sternite bears a row of four or five bristles, and 



proximally to this row four to six somewhat smaller bristles. The eighth tergite 

 bears more than thirty bristles from the ventral margin upwards on the outer 

 surface, the bristles being more nnmerous thaa in the ? of P. simonsi. The lateral 

 bristle of the stylet is placed at the middle in some specimens, and at three-fourths 

 in others ; the apical portion is about half as thick as the proximal portion. The 

 head of the receptaculum seminis is small and rounded, and the tail long. 



