HANSEN AND SÖRENSEN, THE TARTARIDES. 43 



outer angle of the mandibJe. Femur not fully '^/s as long as 

 tibia. Foot conspicuously less than ^ t as long as tibia; its 

 joints as in the male. 



Fourtli Legs. — About as long as or, in contracted fe- 

 ni al es, a little longer than, the body. Fem ur in both sexes 

 slightly more than ' 3 as long as deep (Pl. 2., figs. Ig and Ih). 



Three posterior abdomiiial Segments. — In the females 

 always telescoped, in the males examined (Pl. 2.. fig. Ik) much 

 extended and at least not thicker than those of the other sex. 



Flagellum. — Male (Pl. 2., figs. 1 k and 1 1): Very elongate, 

 almost twice as long as in the female and more than three 

 times as long as broad. Stalk short, a little compressed. Main 

 piece, seen from above, with the basal third much widened, 

 subcircular in outline and posteriorly with a rather long, broad 

 and deep median depression; its distal two thirds very slender, 

 subcylindrical ; basal third of the main piece a little more 

 than half as deep as broad. Seen from the side, the upper 

 margin of the stalk and of the basal third of the main piece 

 is a straight line, and then this margin is suddenly much 

 lowered under a right angle; the lower margin of the flagel- 

 lum shows a very obtuse angle somewhat beyond the base of 

 the main piece, and from that angle to the posterior end the 

 lower margin is slightly convex. The setae proportionately 

 rather short, the longest only between ^s and ^/-t as long as 

 flagellum. — Female (Pl. 2., fig. Im): Rather long, slender, 

 six times longer than deep; second joint scarcely longer than 

 the third; fourth joint a little longer than the sum of the 

 three others. The longest setse about -^r. as long as flagellum. 



31easurements. — Body ^ 4.3, 9 (rather contracted spe- 

 cimen) 4.4 mm. (in a much extended female 5 mm.); palps 

 r^ 2.0, 9 2.P, mm.; first legs 0^ 5.8, o 5.4 mm.; fourth legs 

 ef 4.1, 9 4.0 mm. In a very large male the extended body 

 is 5.1. the first leg 6.8 mm. 



Colour. — Upper surface of the body and all appendages 

 rather dark: head, antennse, palps and first pair of legs reddish 

 brown with a greyish or greenish tint, second thoracic tergite, 

 femora, patellae and tibise of the three posterior pairs of wal- 

 king legs and especially the abdominal tergites greenish brown; 

 the lower surface of the body is considerably lighter. 



Differeiices accordiiig to Age. — In the smallest specimen 

 seen the body measures 2.: mm. and first pair of legs 3.i mm. 



