HANSEN AND SÖRENSEN. THE TARTARIDES. 11 



In Tartarides especially the shape of the lower portion 

 of the trochanterial part differs considerably in various species 

 and sometime? also in the two sexes of the same species ; the 

 same part has besides ahvays on its inner side a very big 

 spine or acute process, the position of which differs somewhat 

 in various species. The length of the claw and the armature 

 of the lo ver margin of the patellar part present also specific 

 characters. In the male of Schizormis insignis n. sp. the palps 

 are so elongate t ha t they are about three and a half times 

 longer than in the female. 



Sterniiin. — The sternal parts of cephalothorax are in- 

 teresting. In Tartarides (Pl. 1., fig. le) the area between 

 the coxse of second pair of walking legs and forwards between 

 the base of the first pair of walking legs is occupied by a 

 large plate {p) which is nearly triangulär, somewhat longer 

 than broad; its anterior margin is either straight or some- 

 what convex, and the sides converge backwards; posteriorly 

 the plate is produced into a point which reaches a little be- 

 hind the base of the second pair of legs; its lateral angle is 

 rather distant from the anteru-interior angle of the coxa of 

 the second pair of legs. Between this sternal plate, which 

 belongs to the head, and the base of the mandibles a large 

 transverse membranous area is seen, but being cleaned with 

 caustic potash it shows itself containing two moderately 

 chitinized transverse strips (fig. 1 o, h — c). The posterior of these 

 strips lies rather near the anterior margin of the sternal plate 

 described; at the middle it has one pair of strong and verv 

 long setse (fig. 1 c, s) which are directed forwards, often hidden 

 in the mesial furrow between the mandibles and reaching 

 almost to their front end. The anterior one of the strips 

 named is less broad (long), on the specimen examined divided 

 into two parts by a transverse line; it bears two pairs of 

 fine hairs, and a fifth hair is seen on the membrane between 

 the anterior (double) and the posterior strip. 



In Oxopoei the sternal plate of the head is proportionately 

 smaller and considerably broader, broader than long, sending 

 a narrow wing outwards behind the insertion of coxae I and 

 above (below when seen from the lower side) the end of coxse 

 II, these coxse being shorter than in Tartarides; besides coxse 

 I are placed considerably higher than coxse II, while in Tar- 



