316 N. E. McINDOO 



Groups 16 and 17 are similar to groups 10 and 11 of the outer 

 side and in number of pores they have about the same variation. 



Group 18 was discernible on all the tarsi. At least two and 

 sometimes three large pores were present on the third tarsal 

 joints. 



As the drone has no sting, the fleshy external part of the penis 

 of several drones was carefully examined. This portion of the 

 penis is always covered with hairs but no pores were found. 



For the nine sets of legs, on the outer side there is a variation 

 from 154 to 201 and for the inner side from 106 to 148, making 

 a total variation from 265 to 349 for both sides, with an average 

 of 303 pores for both sides of three legs. On all six legs and all 

 four wings the drone possesses an average of 2604 pores. 



The thorax, abdomen, head, head appendages — in fact all parts 

 of the chitinous skeleton — of several workers, queens, and drones 

 were examined. Of these appendages only the mouth parts con- 

 tain porelike organs similar in external appearance to these pores. 

 They are not included in this paper, although they may be olfac- 

 tory pores. 



Summary 



For workers, queens, and drones these pores are found on 

 both sides of the bases of all four wings, scattered rather pro- 

 fusely on both sides of the trochanter of all the legs, on the outer 

 side of the proximal end of each femur, on both sides of the tibia 

 at the proximal end, on the second and third tarsal joints, and 

 considerably scattered on the shaft and lancets of the sting. 

 The five groups of pores on the wings are always present, those 

 on the femur, tibia, and sting are generally present, while those 

 on the trochanter and tarsal joints may be partially or almost 

 wholly absent. Generally speaking, all of the 21 groups are 

 nearly always present, are constant in position, but vary con- 

 siderably in the number of pores. 



To compaiTe the total number of pores on one side of an indi- 

 vidual with the total number on the other side of the same speci- 

 men, or with either side of different individuals, it has been ascer- 

 tained that the variation in total number of pores is considerable. 



