369 



process in the same straight line as the tergite, its sides slightly 

 converging; its apex truncate and bifid. Anal sternite with convex 

 border, the tubercles small. Sterna normal, unspined. Legs of moderate 

 length. 



Length about 30 mm.; width 3.5. 



This species differs from the preceding in colouring, in being more 

 convex ; in the different form of its keels , the absence of the inferior 

 crest, the straightness of the caudal process etc. 



Centrodesrnus , gen. no v. 



Antenna? very long and slender, separated by a space equalling the 

 length of the basal segment, which is short being about \ the length 

 of the rest; the 2 nd to the 6 th subcylindrical , and subequal in length. 



The first tergite with very large , basally expanded , distally pointed 

 keels. 



The rest of the segments strongly keeled. The keels situated on 

 the summit of the sides, directed upwards and backwards and inclined 

 to the plane of the dorsal surface at an angle of from 45° to 50°; 

 keels slender, subcylindrical, crescentic; much narrower at the base 

 than the keel-bearing part of the segment; the keels of the 19 th seg- 

 ment tuberculiform. 



Pores conspicuous, just beneath the margin of the keels, situated 

 about \ of the distance from the apex, on the following segments 

 i.e. 5, 7, 9, 10, 12, 13, 15, 16, 17, (18) a ), but not visible on 

 the tuberculiform keels of the 19 th . 



Anal tergite triangular, wide at the base, very slender in front of 

 the apex which is truncate , with two pairs of tubercles on the upper 

 surface towards the apex and two dentiform tubercles on each side 

 along the lateral margin. 



Anal sternite triangular, with the apex pointed, bitubercular. 



Legs very long and slender. 



1) The keels of this segment are fractured distally, so I can not positively assert 

 that they possessed pores. But since these keels are of large size and similar to those 

 of the 17 th segment, there are no reasons for supposing them to be devoid of pores. 



