176 THE EMBRYOLOGY OF THE HONEY BEE 



placed transverse to the long axis of the body and situated 

 between the oesophagus and the suboesophageal ganglion (Fig. 



SlkGl 



FIG. 69. A, side view of the head of an embryo, Stage XI, drawn in 

 outline, showing two of the four invaginations which form the tentorium 

 (iTen, 2Ten}, and also the one of two invaginations which form the 

 mandibular apodemes (RAp), x 243. B, ventral view of the head of a 

 larva about three days old, treated with caustic potash, showing the form 

 and relations of the tentorium (iTen, zTen), x 200. 





