542 IVAR TRÂGARDH 



a short, transversal, ear-like ridge ; basifemur distinctly demar- 

 cated only on the inner (médian) side ; fémur of moderate 

 width, length to width being as 7:5; calcar femoralis 

 long but comparatively slender, its width at the base being 

 only one third of its length, gradually tapering towards the 

 top, and bent slightly forward ; the posterior edge forms an 

 even curve, but at the anterior end there is a very short, incon- 

 spicuous, subterminal tooth. In the anterior angle, between 

 the calcar and the fémur, and demarcated by a circular strip 

 of soft cuticle, there are two short, conical appendages on the 

 same level, or rather one tubercle, the processus axillaris. 

 Whether it is one deeply bifurcated tubercle, or two separate 

 ones, is very difficult to ascertain, owing to the impossibility 

 of obtaining a front view of them. It appears, however, that 

 they are connected witli one another by a ring of darkly 

 chitinized cuticle round their bases. Wether this is so, or not, 

 does not matter, however, as from a comparative morpho- 

 logical point of view it is obvions that, if there really are two 

 separate tubercles, they hâve originated from one, which has 

 become bifurcated, and finely split into two. Genu nearly as 

 wide as the length of its dorsal side, which is twice as long as 

 the ventral one ; processus genuahs articulated, conical, as 

 long as it is wide at the base, and bifurcated at the top, pla- 

 ced at the anterior edge. Behind processus genualis there is a 

 perpendicular bristle, as long as the ventral side of the genu ; 

 tibia about twice as long as it is wide at the middle, tapering 

 gradually towards the top, where it is two thirds as wide as at 

 the base, and bent downwards in the middle. Processus 

 tibialis (fig. 35 6) conical, slighty longer than it is wide at 

 the base, and rounded at the top, placed in front of the 

 middle. Ventrally, in the middle, a perpendicular bristle, longer 

 than that of the genu ; tarsus of a peculiar shape, gradually 

 tapering throughout towards the top, and curved sharply 

 downwards in the middle ; basitarsus distinctly demarcated ; 

 besides the usual setiform hairs there is one ventrally, in 



