PLATE III 



Tig. 15. Photograph of posterior end of abdomen of queen. Dcp and Vcp =Dorsal and 

 ventral genito-anal cover plates; s =sting; Sn =sting notch. 



Fig. 16, Drawing of posterior end of drone's abdomen shov^ing the relative position which 

 the copulatory organ must assume when extruded into the vagina instead of into the open air. 

 In the latter case the drone organ extends backward (curving slightly dorsalward) from the tip 

 of the abdomen in the position represented in Fig. 4. Dcp =Dorsal genito-anal cover plate. 



Fig. 17. Cross section of oviduct (from queen just returned from mating) fiUed and greatly 

 distended with coagulated granular sperm fluid. 



Fig. 18. Small portion of section same as Fig. 17, but with higher power of microscope 

 objective (1-6). ^'w =Distended vaginal wall. 



Fig. 19. Abdomen of newly mated queen received from Mr. Hunt. In this case the drone 

 organ (Pen) had been torn off just proximad of the ventral cross-striped ridges (vv), and was 

 pierced by the sting at "Stn." In the other newly mated queens the "bulb" was the only part 

 of the drone organ left behind in the vagina. 



Fig. 20. An enlargement of the tip of the abdomen shown in Fig. 19. Labeling same as 

 in Fig. 19. 



Figs. 17 and 18, photomicrographs. 



