( oin ) 



three instead of two bristles posteriorly at the apex, by the second and third 

 bristles of the abdominal tergites being obliterated in the S (the second sometimes 

 also in the ?), and by the slight differences in the last abdominal segments. 



5. Pulex erilli spec. 



(PI. VIII. fig. 10. i: ; IX. fig. 22). 



This species is allied to Pulex creusae. 



Head. — The rostrum reaches in both sexes beyond the trochanter. The first 

 of the four segments of the labial jialpiis is nearly as long as the fourth, being half 

 as long again as the intermediate ones. The maxillary paljms is also longer than 

 in Pulex creusae. 



Thorax. — The epimerum of the metathorax bears two rows of bristles, the 

 anterior row consisting of two in the S and of three or four in the ? , the posterior 

 row of fiiur iu the S and five in the ?. 



Abdomen. — The first abdominal tergite bears two long bristles iu front of the 

 postmedian row. The apical bristle of the seventh tergite is longer and slenderer 

 than in Pulex creusae. The abdominal sternites of segments 3 to 7 bear in the S 

 two bristles on each side, and in the ? three or four. 



^egs. — The mid- and hindcoxae have posteriorly at the apex two bristles. The 

 comb of spines on the innerside of the hindcoxa is more regular, and does not stand 

 so close to the apex, the last spine of the comb standing rather nearer the middle 

 than the apex of the coxa. 



All the femora have on the outerside one subapical ventral bristle. The hind- 

 femur bears on the innerside a row of five bristles. 



The mid- and hiudtibiae bear one pair of dorsal bristles less than P. creusae, 

 the third pair being alisent or replaced by a small hair, and the sixth pair being 

 moreover mnch reduced in size. The longest apical ventral bristle of the second 

 hindtarsal segment reaches to the apex of the fifth. The fifth tarsal segment and 

 the claw are slenderer than in P. creusae. The measurements of the tarsi are as 

 follows : — 



Modified Segments.— The movable process k of the clasper (PI. VIII. fig. 16) 

 is slenderer than in P. creusae, and the ninth sternite is less curved (PI. VIII. 

 fig. 17). The eighth sternite of the S bears an irregular horizontal row of three 

 bristles from the middle to near the apex, there being a row nf four in /'. creusae, 

 with an additional bristle above the third. 



The eighth tergite of the ? (PI. IX. fig. 22) bears a row of seven or eight 

 bristles, and two more bristles on the outer snrface. The stylet is conical and three 

 times as long as basally broad, being much slenderer than in P. creusae. 



Length : S, 1-7 mm. ; ?, 2-02 mm. 



We have forty-four specimens of this species, collected by Mr. C. J. B. Grant, 

 as follows : — 



