298 THE ENTOMOLOGIST. 



notches, each bearing a pair of bristles, and these pairs are of about 

 the same length, and either equal the longest apical hind tarsal 

 bristle, or, if the latter bristle is much prolonged, are shorter than it. 

 The second hind tarsal segment (fig. 3, male) has on the hinder side 

 one pair of bristles besides the apical pair. The longer bristle of 

 both pairs is prolonged, the long subapical bristle reaching in the 

 male almost to the apex of segment five, and in the female not quite 

 to the apex of segment three, and the longer apical bristle of the 

 second segment extending in the male far beyond the claws, and in 

 the female to the base of segment five. This last segment bears in 

 all the tarsi four pairs of lateral bristles. 



Modified segments. — $ . The clasping organs very closely re- 

 semble those of B. masculana, but the clasper (fig. 1, CI) is much 

 more bent upwards in its distal half, the long bristle placed at 

 its dorsal edge has a much more proximal position ; and the 

 distance from the base of the movable process F to the base of 

 the manubrium is longer than the breadth of the clasper. The 

 "finger" P, which is rather strongly curved proximally, does not 

 quite reach to the tip of the clasper and about equals in length its 

 distance from the base of the manubrium. The apex of the inner 

 arm of the ninth sternite (ix. st.) is broad and rounded, with 

 the anterior angle produced into a short beak. The ventral arm 

 (measured along the ventral margin) is distinctly longer than the 

 vertical one. It is canoe-shaped, and bears a number of minute 

 bristles, as shown in fig. 1. 



2 . The seventh sternite bears a single row of twelve bristles on 

 the two sides together, and its apical margin has a small rounded 

 subventral sinus, above which there is a short rounded lobe (fig. 2, 

 vn. st.) variable in size. The eighth tergite has three or four long 

 bristles below the stigma, a row of seven near the apical margin, and 

 seven or eight more proximally to this row. On the inner surface 

 the segment bears five short stout bristles. The outline of the apical 

 edge of the segment is rather obscured in the example from which 

 the figure is taken. The head of the receptaculum seminis (e. s.) is 

 quite short and hardly at all separated from the tail, the latter 

 narrowing strongly apically, and bearing on the dorsal side a hump 

 at the beginning of the narrow portion. 



One male and two females from Burkhan, near Djarkent, 

 Semitchenskoi, East Turkestan, off white weasel, February 

 15th and 19th, 1912 (W. Riickbeil). 



2. Rhadinopsylla cedestis, n. sp. (PI. xiv., figs. 4, 5, 6.) 

 $ $ . Although closely resembling B. bivirgis, the present species 

 appears to be perfectly distinct, differing essentially in the tarsi and 

 the modified abdominal segments. In contradistinction from all the 

 other known species of Bhadinopsylla, the present form has five 

 pairs of lateral bristles on the fifth segment of all the tarsi in both 

 sexes, one mid tarsus in the male having six bristles on one side and 

 five on the other. The longest apical bristle of the hind tibia reaches 

 beyond the apex of the first tarsal segment. The hind tarsal bristles 

 are different in length from those of B. bivirgis ; on the first segment 



