322 



COLLEGE ZOOLOGY 



tions of the wings and by the vibrations of a membrane which 

 lies within each spiracular opening of the respiratory system. 



Sense-organs of touch are hair-like structures on various parts 

 of the body, but especially numerous on the antennae. Two 

 kinds are shown in Fig. 244, (i) small hairs (/), and (2) large 

 " conoid " hairs (c). 



REPRODUCTION. - - The sexes are separate except in abnormal 

 cases. The spermatozoa arise in the two testes (Fig. 245, Tes), 



and pass through the vasa 

 deferentia (VDef) into the 

 seminal vesicles ( Ves) , where 

 they are stored. The sem- 

 inal vesicles open into large 

 mucous glands (AcGl) which 



unite at a point where the 

 ejaculatoryduct begins (/ D). 

 During mating the sperma- 

 tozoa pass through the 



FIG. 24S .- Reproductive organs of drone ejaculatory duct and are 

 bee, dorsal view, natural position. AcGl, ac- transferred to the seminal 



cessory gland; B, bulb of penis; EjD,eja.c- rprpntar l p n f t ], p f prna l p 

 ulatory duct; Pen, penis; Tes, testis; f? 1 



vDef, vas deferens; Ves, seminal vesicle; (Fig. 246, Spm) by the 



II, uu, yy, zz, parts of penis. (From Snod- . /T- N 



grass, Tech. Series, 18, Bur. Ent., U.S. "**' 2 45> \ 



Dep't of Agric.) The reproductive organs 



of the workers are undevel- 

 oped ovaries. The abdomen of the queen is almost completely 

 filled by the two ovaries (Fig. 246, Ov). Each ovary consists of 

 a number of ovarian tubules (ov) in which are eggs in various 

 stages of development. When ready for deposition, the eggs pass 

 through the oviducts (OvD) into the vagina ( Vag). They are 

 fertilized by spermatozoa from the seminal receptacle (Spm) or 

 spennatheca. The queen seems to be able to lay fertilized or 

 unfertilized eggs according to the size of the cell in which they 

 are to develop. Fertilized eggs are laid either in small worker 

 cells (Fig. 248) or in large irregular queen cells, and develop into 



