42 



MR. K. M. SMITH OiV CERTAIN SEKSE-ORGANS 



In £ibio sp. the sensilli in the autennse, though increased in 

 size, still occur singly or in pairs. Text-fig. 7 is a drawing of a lon- 

 gitudinal section of the antennte of jBibio mard 5 ; in this species 

 sense-pits are present, though the sensory processes are not very 

 numerous nor very deeply sunk, one sense-pit occurs in each 



Text-fiffure 8. 



Tiansverse section through the palp of Bihio niarci. X 600. 



segment of the antenna. In the palp the number of pits is 

 greater, and most of the upper surface of the palp in the region 

 near the head is broken up into sense-pits (text-fig. 8). 



Wesche (5) describes sense-pits in the second joint of the palpi 

 of Bihio horiulanus. 



SlMULIID^. 



I have not examined any members of this family, but Wesche 

 (5) describes pits in the palpi of Siinulium reptans. 



Rhyphid^, 



Wesche (5) describes sense-pits in the palpi of Ehyphus 

 fenesiralis. 



