BEES. 225 



cold and bleak and had been such for some days. 

 The Adult (Plate 27, Fig. 6) when examined with 

 a lens showed the presence of thick brushes of hair 

 on the head, thorax, and legs, and there was a broad 

 patch of grey hairs on each side of the thorax. 



The hind leg (Plate 27, Fig. 8) is most notice- 

 able owing to the enlargement of the tibia. It is 

 rather smooth and polished looking, with a shallow 

 depression on the outer side, and it is thickly fringed 

 with hairs — thicker on the outer edge. On examin- 

 ing with the microscope these hairs on the outer 

 margin were seen to be branched (plumose), but 

 the branches are simple and the hairs are, on the 

 whole, stiff and regular, not slender and thread-like 

 with compound branches as one sees in the '*gath- 

 ering hairs" of the hive bee. The plumed hairs of 

 Trigona are also irregular in having the branches 

 developed more on one side ; on the other they 

 are often just small projections. (See Plate 27, Fig. 

 9). The majority of the hairs on the inner side of the 

 pollen-basket were simple, unbranched and stiff. 

 The first tarsal joint is also much enlarged to form 

 an instrument to aid in gathering and carrying the 

 pollen. On the under side it is thickly clothed 

 with stiff hairs, and on the lower margin it has a dis- 

 tinct row of thick, straight spines like a straight 

 comb. A noticeable feature was the absence of 

 the gathering hairs on the femur or thigh, they were 

 confined to the tibia in the specimens we examined. 



The second pair of legs was the smallest, and 

 here, too, the tibia was thickly clothed with gath- 

 ering hairs on the outer margin, and on the inner 



