Studies on Arthropoda I. 



The upper side of the body moderately haired; all hairs 

 very thin and most of them very short, cylindrical, not acute; 

 the lower surface of abdomen has but few hairs, while on the 

 <ioxx the hairs are more numerous and moderately long. The 

 legs have a good number of hairs (figs. 21 and 2 k), most of 

 them normal, acute, but on the proximal joints and especially 

 on the femora many of the hairs are shorter and not acute. 

 The palps hairy excepting the major proximal part of their 

 trochanter (fig. 2 h) . 



Sexual differences only moderately conspicuous. In the 

 female the tarsus of fourth pair is shaped as third pair; in the 

 male the fourth tarsus is near the base on the upper side (fig. 2 k) 

 produced into a process as long as the depth of the tarsus, 

 rather slender, somewhat tapering from the base to beyond 

 the middle, with the short distal part (fig. 2 1, t) marked off 

 and oblique-triangular, acute; the process is directed some- 

 what upwards and much backwards and is distinctly curved; 

 the upper surface of the tarsus below the proximal half of the 

 process is, seen from the side, somewhat concave. In the 

 male the genital aperture (fig. 2 c) is nearly circular; a genital 

 operculum is not marked off posteriorly, but its front margin 

 is almost semicircularly concave; the arculi are somewhat 

 narrow, almost three times as long as broad at the base, and 

 not much decreasing in breadth from the base forwards. In 

 the female (fig. 2 d) the genital aperture is a little smaller than 

 in the male and differs somewhat in shape; the genital oper- 

 culum (r), which is very short, is marked off by a transverse 

 impression, and has its front margin straight, and this margin 

 is much shorter than the breadth of the aperture; the arculi 

 are moderately broad and at the base considerably broader 

 than in the male (m), with the inner margin regularly concave. 



Colour. -- The body is dark reddish brown, with the 

 coxse and the anterior part of the cephalothorax still darker, 



