22 



COLLECTING AND PRESERVING INSECTS. 



Alypia of Grape. 



veined wings are also covered with dust-like scales. Their 

 transformations are complete. The active larvae assume a 



worm-like form with several 

 pairs (1-5) of fleshy false legs 

 besides the thoracic ones ; the}^ 

 spin silken cocoons before 

 changing to pupa? (chrysalides, 

 nymphs), with the exception 

 of the butterflies. The limbs of 

 the chrysalides are soldered to- 

 gether, and the abdomen is 

 movable upon the head and 

 thorax. 



Diptera (Flies. Fig. 18, Orta- 

 lis fly and larva) have the mouth 

 parts formed into a kind of proboscis ; the second pair of 

 wings are undeveloped, being reduced to a pair of pedicelled 

 knobs serving as ^. , D 



° Fig. 18. 



balancers or />o?s- 

 ers. Their trans- 

 f o rmations are 

 complete, the larvae 

 being maggots or 

 elongated w o r in- 

 like embryos. The 

 pupae often change 

 within the skin of 

 the larvae, which serves as a cocoon. The limbs are free. 



Many of the species are 

 aquatic. Here we first 

 find wingless parasites. 



Coleoptera (Beetles. 

 Fig. 19, Asemum beetle, 

 a, larva, b, pupa ; fig. 20, 

 Potato beetle) are known 

 by their hard bodies, free 

 and well developed mouth 

 parts, and by the first 

 pair of wings being hard- 

 ened into sheaths (elytra) for the protection of the second 



Ortalis and Mairgot. 



Fipr. 19. 



Fig. 20. 



Asemum and 



Potato Beetle. 



