INSECTS 



its frothy texture. It soon sets into a jellylike substance, 

 then becomes firm and elastic like soft rubber, and finally 

 turns dry and brittle. 



The date of the egg laying depends on the latitude of 

 the region the moths inhabit, varying from the middle 



/ ! 



Sprn Bcpx Dov 



Fig. 16c. The female reproductive organs of the moth of the tent caterpillar, 



as seen from the left side 

 a, external opening of the bursa copulatrix; An, anus; b, opening of the vagina; 

 Bcpx, bursa copulatrix; CIG1, colleterial glands, which form the substance of the 

 egg covering; Dov, duct of the left ovary; Ov, left ovary, full of ripe eggs; ov, ov, 

 upper ends of the ovarian tu bules; Reel, rectum ; Res, reservoirs of the colleterial 

 glands (C/GJ); Spm, spermatheca, a sac for the storage of the spermatozoa; //, 

 terminal strand of the ovary; Vg, vagina 



of May in the southern States to the end of June or later 

 in the north. While the eggs will not hatch until the fol- 

 lowing spring, they nevertheless begin to develop at 

 once, and within six weeks young caterpillars may be 

 found fully formed within them (Fig. 166 B). Each little 

 caterpillar has its head against the top of the shell and its 

 body bent U-shaped, with the tail end turned a little to 

 one side. The long hairs of the body are all turned for- 

 ward and form a thin cushion about the poor creature, 

 which for crimes yet uncommitted is sentenced to eight 



[3 I2 1 



