296 



ME. R. I. POCOCK ON THE 



Hind half of each somite shining black, with reddish tinge at 

 its posterior margin ; anterior portion black but less shining. 

 Head dark brown, shining. Legs and antennae shining dark 

 brown, with distal margin of each segment yellow. 



Each somite divided by a sulcus, which is deeper at the sides 

 than above, into an anterior and posterior portion : posterior 

 portion smooth above, striated at the sides and below ; anterior 

 portion marked towards its free margin by fine concentric striae. 



Belly-grooves oblique ; those of the posterior somites shorter 

 than those of the central and anterior somites. 



First dorsal plate not extending laterally below those that 

 succeed it ; antero-inferior border rounded, with raised and 

 thickened margins ; the groove that marks this thickened margin 

 reaching up to the ocular area ; postero-lateral portions very 

 faintly striated. 



Forehead with median sulcus. 



Posterior segment produced into a short upturned spine, 

 projecting slightly beyond the margin of the anal valves. 



Anal valves with margins thickened and strongly compressed ; 

 sub-anal plate triangular, not separated by a groove from the 

 posterior segment. 



In the male the antenna? are relatively longer than they are in 

 the female ; the head is shorter ; the raised margin of the first 

 dorsal plate thicker, and the free border of the anal valves more 

 convex. 



Anterior lamina of copulatory organ simple and spatulate, 

 dilated below, slender above ; the apex of the upper slender 

 portion attached to a small triangular plate, by which it is con- 

 nected with the corresponding piece of the opposite side. The 

 posterior lamina, viewed from the front, dilated below, rod-like 

 above ; the inferior border of the lower dilated portion giving oft' 

 two processes, an external and an internal ; the external process 

 projecting downwards and inwards. The anterior and posterior 

 lamina) of the copulatory organ are continuous behind, and they 

 together form a sheath for the central lamina, which is above 

 attached to the superior rod-like portion of the posterior lamina. 

 Each central lamina consiHts of a slightly curved, elongate, moro 

 or less cylindrical piece, which below is produced into an up- 

 curled membranous expansion. At the proximal end of this 

 there is an elongate slender piece, terminated by a small sharp 

 hook. From the inner margin near its proximal extremity this 

 membranous portion gives off a sharp, slightly curved spur ; its 



