532 IVAR TRAGARDH 



gnous witli tlie so-called second joint of Perganiasus and 

 Parasitus. They are thin and narrow, but hâve thin ventral 

 blades, ending in an acute tooth, along the proximal half of 

 the edges. 



Ventral side without any peculiar characteristics. 



The legs. Legs II (fig. 20) of a very characteristic shape, 

 as a matter of fact, not resembling those of any other species 

 as yet known. Troc hanter very large, triangular in outline 

 (on latéral view), nearly as mde as the fémur. Fémur much 

 wider than it is long (width to length as 3 ; 2), with very 

 short, ring-shaped basifemur; calcar femoralis (fig. 20a) 

 long, sickle-shaped, slightly constricted at the base, curved 

 slightly backwards and inwards ; it is truncated at the top, 

 and the anterior edge has a blunt tooth; processus axillaris 

 a low ridge, set off from a cylindrical tubercle near the base 

 of the calcar bya narrow fissure where the cuticle is thinner ; 

 tubercle pointing obliquely outwards at nearly a right angle 

 to the calcar. 



Genu as wide as it is long, processus genualis rectan- 

 gular, with thin concave ventral edge, about twice as long as 

 it is wide ; at the interior side of it tliere is a long, perpendicular 

 bristle; processus tibialis ofalmost the same shape as pro- 

 cessus genualis, but slightly longer and with a low, rounded 

 tooth near the anterior edge; at the inner sideof the processus 

 tibialis there is a perpendicular bristle which is, however, 

 difïerently shaped to that of the genu, being widest a little 

 above the base, and thence gradually tapering towards the top, 

 so that the distal third is very fine. 



Tarsus with distinctly demarcated basitarsus curved in 

 an even curve downwards. It bears numerous straight, pointed 

 bristles, at the base of one of which, inserted a little behind 

 the middle, ventrally, there is a remarkable structure. We notice 

 two fine Unes or fissures running backwards from the pore in 

 which it is inserted, and at the same tinie diverging ; the 

 flask-shaped portion enclosed by thèse fissures is slightly raised 



