^.2 Studies on Arthropoda. I. 



process is scarcely di\-ided into a proximal and a much shorter 

 distal part. 



In the male the genital aperture (tig. i c) is nearly twice as 

 broad as long, with the anterior margin considerably curved, 

 the posterior margin feebly concave; the genital arculi [m) 

 posteriorly rather narrow, anteriorly considerably widened 

 inwards, at the median line about as long as the aperture, 

 and with the anterior, the inner, and the posterior margin of 

 their front part distinctly raised. No genital operculum is 

 marked off, but a little behind the genital aperture projects 

 a large, broad, oblong, subacute process (p) directed down- 

 wards and mainly backwards; this process is somewhat depres- 

 sed and even slightly hollowed on the proximal part of its lower 

 side; at the sides and behind this process the ventral surface 

 of the abdomen is considerably excavated, and the excavation, 

 which is oblong, occupies more than half of the surface between 

 the base of the process and the front (lower) margin of the 

 anal operculum. — In the female (fig. i d) the genital aperture 

 is still shorter than in the male; the genital arculi are not mar- 

 ked off from the coxa? and each terminates in a subacute angle. 

 The genital operculum is not marked off posteriorly, in front 

 it is very narrow with the end cut off transversely, and it is 

 deeply impressed just behind that end; the surface of abdomen 

 has no process and no excavation as in the male. 



Colour dark. Body and first joint of the antennae from dark 

 reddish-brown to blackish brown; the distal joints of the an- 

 tennae and the legs more or less dark reddish-brown, with the 

 tarsi frequently a little lighter; palps brownish yellow, with 

 tlie distal joints lighter. 



In the male figured the body is 3.45 mm long and 2 mm 

 broad, cephalothorax 1.6 mm long, first leg 2.5 mm, fourth 

 leg 2.6 mm. The single female is 3.52 mm long and 2.07 mm 

 broad. 



