422 Journal of the Asiatic Society 6f Bengal. [N.S., XIX, 
fifth somite with four spines and a similar number of groups of 
long setae equidistantly placed on the centre of the posterior 
dorsal margin, two on each side of the mid-dorsal line; sixth 
somite with one group of two spines and two groups of fine 
long setae on each side of the mid-dorsal point of the posterior 
margin. The arrangement of the spines and setae on the 
asymmetry (see fig. 8) in the number and position. J have, 
however, failed to detect a single specimen with spines on the 
fourth somite. 
Antenna 1.—Not half as long as the body and not difter- 
ing appreciably in the sexes either as to length or adornment of 
setae; longer than antenna 2; peduncle extending only slightly 
beyond the distal end of the fourth joint of the peduncle of 
antenna 2, first joint about equal to, it anything slightly less 
than, the combined lengths of the second and third joints ; 
primary flagellum consisting of about 19-21 joints ; accessory 
flagellum of three or four joints (in the latter case the fourth 
joint is very small) and equal in length to the first three or 
four joints of the primary flagellum; whole appendage but 
sparingly furnished with a few short setae and without clusters 
of long setae on the lower margin of the joints of the peduncle. 
Antenna 2.,—Shorter than antenna 1, peduncle extending 
to about the level of the distal end of the third or fourth joint 
have a very similar shape and armature except that the spine 
on the middle of the palmar margin is absent in both cases. 


