in the British }fuseum. 137 



also sonic irregularities. The other halt' part (the right) of 

 the second tergite is rather short, hut otherwise of usual 

 shape; it is separated in its whole length from the right 

 portion of the third segment, which is distinctly widened out 

 towards the middle. If we regard the two segments as a 

 whole, it will easily be seen by looking at the figure that the 

 two half parts are of almost equal length laterally, but that 

 the riglit half is distinctly longer than the left in the middle. 

 The longitudinal line between the two is not parallel to the 

 longitudinal axis of the body, but forms an acute angle with 

 it. The left portion of the fourth tergite is rather long and 

 ATcll separated from both the third and fifth, especially 

 towards the middle, where it becomes narrower. The right 

 half is exceedingly narrow and rather short ; the space 

 between the two portions is very Avell marked, being twice as 

 broad as the right half and more than half as broad as the 

 left half. The wide open area thus formed is limited behind 

 by the convex margin of the right half of the otherwise 

 regular fourth tergite ; it is like an attempt at lessening the 

 unprotected wide space. The ventral side shows no trace of 

 these irregularities. 



Cheliferjavanus, Thor., ^. (PI. YIII. fig. 1 «.) 



As [ looked over the collections of Chelonethi from India I 

 discovered a specimen ( ^ from Thavravadi, Burma) w hich w^as 

 remarkable for its abnormal segmentation. The first and 

 second abdominal tergites are normal, but the two following 

 show a peculiar structure. The left half of the third tergite is 

 fused with the right half of the fourth. I have not been able 

 to distinguish the longitudinal line which elsewhere divides the 

 sclerites, and it is consequently impossible to tell where the 

 one begins and the other ends. The right half of the 

 sclerite thus formed is much longer and somewhat narrower 

 than the left. The right half of the third tergite is without 

 connexion with the corresponding left half; its sclerite is 

 triangular and rather short. The left portion of the fourth 

 tergite passes into the right^ but its sclerite has no connexion 

 with the sclerite of the right side. The positions of the hairs 

 are as usual, and_, as seen in the figure, not the same in the 

 third and the fourth tergites. The right side of the latter 

 shows some irregularities, as the hindmost row of hairs are 

 placed behind the hinder margin of the sclerite. The ventral 

 side shows no trace of the described abnormalities. 



In the following I enumerate a few similar cases of 



