THE EMBRYOLOGY OF THE HONEY BEE 185 



Oe 



FIG. 70. Oenocytes (Oen~), surrounded by fat cells. A, from a larva 

 about four days old, x 387; B, from a newly hatched larva, x 1107. 



nations of Melolontha as described by Graber (1891). Figure 

 71 shows half of a tranverse section through the region between 

 the fourth and fifth trunk segments and intersecting the first 

 metastigmatic invagination (Oen), showing its position and 

 relation to the surrounding tissues. In figure 72A is shown one of 

 these invaginations more highly magnified. There are in all eight 

 pairs of these, as in those insect embryos examined by Graber 

 (1891) and Wheeler (1892). The first pair is the largest, those 

 caudad successively smaller, the last being faint and not easy to 

 discern. Each invagination is funnel-shaped externally. Inter- 

 nally it is formed by a cluster or rosette of long pyriform ectoderm 

 cells as shown in the figure, the entire structure strongly suggest- 



