of the Oil Beetle, Meloe. 357 



Fig. 21, 22. The larva of Stylops on the hair of Andrena Trimmerana, soon after birth: — 

 magnified. 



Fig. 23 to 32. The ovum in various stages of development, a. The yelk formed of cells. 

 b. The blastodermic layer, c. Sulcus on the yelk. d. The blastoderma reflected 

 on itself, and forming the ventral surface of the future embryo, e. The thorax, 

 and entrance of the last portion of the yelk. /". The legs. g. The amnion. 



Fig. 33. The male Stylops aterrimus : — highly magnified. 

 a. The same : — natural size. 



Fig. 34. The larva of Cryptophagus cellaris : — magnified. 

 u. The same : — natural size. 



Fig. 35. The head of ditto: — magnified. 



Fig. 36. The nymph state : — magnified. 



