Development of an Embiid. By J. C. Kershaw. 



27 



whole dorsal region does not take place until just after the embryo 

 has assumed its final position in the egg, as it appears just previous 

 to hatching. This final movement of the embryo must take place 

 within a very short time, since out of many sections made of 

 batches of eggs consisting wholly of late recurved and final position 

 embryos, only two or three were in the intermediate position. 

 Probably the movement is effected within an hour or two. After 

 this semi-revolution the insect remains some 16 days in the egg 

 whilst the musculature, etc., develops, and then hatches out in the 

 earl y "morning. * 



The nymphs appear to remain with the female under the same 

 web for weeks. 



As all the eggs are not laid the same day, but with an interval 

 of about ten days from first to last, it is difficult to fix exactly the 

 length of the various embryonic stages, but the following dates 

 compiled from a number of egg-batches are approximately 

 correct : — 



Egg laid 



Primitive band discernible 

 Tail just recurved ... 

 Ready to revolve 

 In position as at batcbing 

 Hatcbes 



6tb 

 12tb 

 24tb 

 24tb 

 40tb 



day 



There is, properly speaking, no real revolution of the embryo, 

 since the head from start to finish is always on the ventral side' of 

 the egg, though right at its posterior pole, But, as may be seen 

 from the figures, there is a considerable movement of the embryo. 



In, conclusion, from what we have observed of the habits, 

 anatomy and embryology of this Embiid, we have no doubt what- 

 ever that it is really an Orthopterous insect (probably near the 

 Earwigs) and should not be included in the Neuroptera. 



* Tbe nympb, just at batcbing, is tbus enveloped in three membranes :— 

 tbe oolemma ; tbe membrane secreted by tbe serosa ; a cuticle moulted by tbe 



nympb. 



Tbese tbree membranes are left witbin tbe egg-shell on batcbing-out. 



