2 THE ENTOMOLOGIST. 



the females there are two bristles on one and three on the other femur. 

 The hind tibia bears, besides the apical and dorsal paired bristles, only 

 one row of hairs on the outer side, there being no hairs on the inner 

 and ventral surfaces. The long apical bristles of the fore tibia reaches 

 to the apex of the second tarsal segment, or a little beyond it. The 

 fourth segment of the fore tarsus is nearly twice as broad as it is long. 

 The fourth segment of the hind tarsus is short, being only a little 

 longer than it is apically broad. The first hind tarsal segment bears 

 externally on the ventral surface a row of two, three, or four long 

 hairs. The second hind tarsal segment bears at the apex on the outer 

 side (hinder side on slide) two long bristles, of which the longer one 

 reaches to the claw, while the second extends beyond the middle of the 

 fifth segment. The fifth segment of all the tarsi bears on the ventral 

 surface at the apex only two bristles instead of three, the external one 

 being absent, as is the case in several species of this group of Pulex. 

 The eighth sternite of the male bears on each side a single bristle 

 beyond the middle, and another close to the apex. The clasper bears 

 (fig. 1) three processes, as shown in the figure. The uppermost is the 

 largest, being widest near the rounded apex. The process bears at the 

 apical edge a number of bristles, of which the second, counted from the 

 ventral side, is the longest. The second process is very slender, while 

 the third is short and broad, being nearly square. The manubrium is 

 very slender. The ninth sternite is elongate (fig. 2), finger-shaped, 

 bearing subdorsally before the apex two hairs placed close together, and 

 several shorter hairs ventrally at and near the apex. The internal 

 plate of the penis is similar to that of P. nubicus,-'- being ventrally at 

 the apex more evenly curved than in the specimen of P. nubicus, from 

 which the figure was taken. The penis bears apically a conical struc- 

 ture which is clothed with short hairs. The ninth tergite of the male 

 bears internally above the manubrium a short projection, which is more 

 distinct than in the allied species (P. nubicus, P. 'pallidus, &c.). The 

 eighth abdominal tergite of the female does not bear any hairs above 

 the stigma (fig. 4). The apical margin is broad, rounded, and ventrally 

 sinuate. There is a series of seven or eight bristles near the edge, the 

 uppermost standing ventrally of the first apical bristle. This row is 

 continued ventrally by three or four more long bristles, as shown in the 

 figure. On the lateral surface there is one long solitary bristle on a 

 level with the first apical one, and two more bristles further down, the 

 second of these being a little more ventral than the last apical one. 

 The so-called pygidium is a little longer than broad in side view. 

 Length : <? , 1-5 mm. ; ? , 2-4 mm. 



Three males and five females were secured in March, 1903, 

 at Bir Victoria, from Gerbillus tarahuli, and one male, at the 

 same locality and at the same time, from Pachyuromys dupresi 

 natronensis. 



2. Pulex ramesis, n. sp. (Plate I., fig. 2.) 



This species is very closely allied to P. mycerini, but differs in the 

 sexual apparatus of the male, and in the legs of both the male and 



* Em. Mo. Mag. (2) xiv. p. 84, t. 2, f. 10, 16 (1903). 



