THE STRUCTURE OF THE BEE'S STING 



175 



make attachment to two levers (?, *'). The levers (k, I and k', Z') are provided 

 with broad muscles, which terminate by attachment to the lower segments of 

 the abdomen. These, by contraction, revolve the levers aforesaid round the 

 points /, /, so that, without relative movement of rod and groove, the points 



FIG. 195. Details of sting of bee : E, darts, sheath, and valves ; pb, poison-bap duct ; fo, fork ; 

 .9, slide piece ; ra, valve ; b, barbs. f\ terminal abdominal segments ; ir, worker's sting ; tj, queen's 

 stinir : /'. r', anal plate: , sting 1 entering skin: ,s/(, >heatli : </. l>. c. po.-itions in first, second, and 

 third thrusts with the sting. //, portion of poison gland, x 3nn ; ,-n. cell nucleus; , nerve; g, 

 sranirlionic cell. 7, portion of the poison gland, cells removed ; cd, central duct ; d, individual small 

 ducts: jir. tunica propria. A", gland of Fni-nti,-n niftt : eft. central duct; <7, small ducts; KC, 

 secreting 1 cells. L, valve and support; t, trachea; T<I, valve; tr, truss or valve-prop. After 

 Cheshire. 



