The Glow- Worm andi Other Beetles 



Anthophora, this apparent anomaly never 

 occurs, because the secondary larva, when 

 on the point of transformation into the 

 pseudochrysalis, is always careful to place 

 its head uppermost, according as the axis of 

 the cell more or less nearly approaches the 

 vertical. But, when the pseudochrysalids 

 are placed higgledy-piggledy in a box or jar, 

 all those which are upside down will later 

 contain inverted larvae or nymphs. 



After four changes of form so profound 

 as those which I have described, one might 

 reasonably expect to find some modifications 

 of the internal organization. Nevertheless, 

 nothing is changed; the nervous system is the 

 same in the tertiary larva as in the earlier 

 phases; the reproductive organs do not yet 

 show; and there is no need to mention the 

 digestive apparatus, which remains invari- 

 able even in the perfect Insect. 



The duration of the tertiary larva is a 

 bare four or five weeks, which is also about 

 the duration of the second. In July, when 

 the secondary larva passes Into the pseudo- 

 chrysalld stage, the tertiary larva passes into 

 the nymphal stage, still inside the double 

 vesicular envelope. Its skin splits along the 

 back in front; and with the assistance of a 

 few feeble contractions, which reappear at 

 126 



