60 ARKIV FÖR ZOOLOGI. BAND 2. NIO 8. 



First Le^s. — 3Iale (fig. 3 a): Very slender, rather little 

 less than twice as long as the body. Coxa terminates a little 

 in front of the outer angle of the mandible. Femur slightly 

 longer than tibia. Foot a little less than two thirds 

 as long as tibia, slightly more than twelve times longer 

 than deep and deepest at the end of metatarsus (fig. 3 c); 

 second metatarsal joint as long as the distance from its end 

 to the middle of the fifth tarsal joint; terminal joint somewhat 

 longer than the sum of the two proximal tarsal joints, and a 

 little less than half as long as the whole metatarsus. — 

 Female (fig. 3 d) : Slender, somewhat less than ^J2 as long as 

 the body. Coxa terminates a little behind the outer angle of 

 the mandible. Femur scarcely longer than tibia. Foot slightly 

 less than two thirds as long as tibia, slightly more than ele- 

 ven times longer than deep (fig. 3 g), with the relative length 

 of its joints nearly as in the other sex. 



Fourth Legs. — Male (fig. 3 h): Slender and considerably 

 longer than the body; femur rather little less than three times 

 as long as deep. — Female (fig. 1 a) : Moderately slender and 

 somewhat longer than the bod}^; femur not fuUy two and a 

 half times longer than deep. 



Three posterior abdominal Segments. — In the female 

 withdrawn and normal as to shape and size. In the male 

 they are less withdrawn and much larger than in the female; 

 especially the terminal segment (figs. 3 i and 3 k) is most cha- 

 racteristic : it is nearly twice as deep as in the other sex, and 

 its upper half is produced conspicuously backwards, forming 

 a short, broad, rounded protuberance situated as a roof above 

 the base of flagellum. Seen from above, this terminal segment 

 in the male is produced strongly forwards as a very broad, 

 moderately low cone beneath the integument of the penulti- 

 mate and of the posterior part of the antepenultimate segment. 



Flagellum. — Male (figs. 3 i and 3 k): Comparatively very 

 large. The stalk is uncommonly short. Seen from above, the 

 main piece is elongate heart-shaped, with the posterior part 

 strongly produced and rather narrow; a considerable part of 

 the lateral margins is therefore rather concave. A träns verse 

 curved impression is f ound at tlie middle of the broad portion ; 

 the upper surface just in front of the narrow portion is set 

 with a number of setse, and the posterior third of the main 

 piece is adorned with a narrow brush of setae. Seen from 



