ANTEJSrX^ OF THE HOKET-BEE. 



85 



The scape is rather less than half the length of the flagellum* 

 The larger portion, or shaft, has its anterior eud cut off obliquely 

 and so allows of the flagellum beading upon it by a simple 

 motion of flexion and extension. These motions are produced, 

 one by a muscle arising from the lower inner wall, and in- 

 serted into the lower side of the second segment of the antenna 

 (fig. 2 d) ; the other by a muscle arising from the upper inner 

 wall, and inserted into the upper side of the same segment 

 (fig. 2 e). 



lu^.5 



JFig. 1. Outline of head of Bee, showing position of antennse. 



Fig. 2. Sectional view of antenna ;. with enlargements of upper and under part 



of the articulation to show the insertion of the muscles e and d ; c, nerve. 

 Fig. 3. The antennary fossce from below. The dots b and d show position of 



insertion of muscle ; a is the peg or process upon which the antenna moves. 



The segments forming the flagellum are alike in form and 

 vary but slightly in size, the most distant one (the 12th of the 

 antenna) being twice, and the fifth being about 2| times longer 

 than broad. The fourth is peculiarly short, not being more than 

 two thirds of its breadth, and moreover tapers somewhat towards 

 its posterior end. The third continues the tapering, but in length 

 is twice its mean breadth. The second is slightly bent, and bears 

 on each side the swelling or knob upon which the flagellum 

 hinges with the scape. 



The joints connecting together the segments numbered in fig. 

 2 as 4 to 12 are all very similar in plan, and consist essentially 

 of a convexity on the posterior end of one segment fitting into 

 the concavity of the anterior end of the preceding segment. 



