ei8 



We find in the humble bee another variety of this very re- 

 markable organ. Fig. 16. 



In it the plantar surface of the foot is covered largely with 

 imbricated scales and a few short hairs ; between the hooks 

 there is a large central boss densely covered with long hairs ; 

 behind this, as we examine it from below, is what appears to 

 be a hollow cap of a triangular shape, its apex being directed 

 forwards. It is evidently hollow and appears puckered in- 

 wardsj where the pillar by which it is connected with the foot 

 is inserted. 



In the honey bee this peculiar structure is replaced by a 

 membraniform expansion, in which I can see a faint re- 

 semblance to the organ on the foot of the scorpion fly. Tliere 

 is a division into two parts and a connecting link between 

 them ; but in this instance the two sides appear to be united 

 into one thickness, or at least to be very near to each other. 

 Fig. 17. 



This expansion is covered with minute hairs and may be used 

 as a sort of plastering trowel in the formation of the honey 

 comb, as well as for purposes of locomotion. It possesses 

 another expansion densely covered with large hairs, by which 

 it is enabled to attach itself to smooth surfaces. 



We find, as we continue our enquiries, that this central 

 organ has an office very similar to that of the ordinary discs 

 attached to the feet of the musccs. and other insects. That 

 they are in fact nothing more than sticking or adhesive flaps, 

 strengthened each in its own particular way, and which are 

 packed up when not in use. 



This is well shown, by the examination of the foot of the 

 wasp and hornet y in which this central expansion is developed 

 to the utmost. 



In the foot of the former, this peculiar organ of which we 

 have been speaking, receives a greater and a far more striking 

 development than in any other. It is situated on the dorsal 

 surface of the foot, and is quite different from the adhesive boss. 



