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The mouth armature of the larva of Mydæa anomala is very 
interesting on account of its pronounced adaption to the biology of 
the larva. In the first stage, in which the larva penetrates through 
the integument of the host, the two mouth hooks form a bore with 
sharp teeths placed eminently well for the purpose of producing 
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Figs. 4—9. Mouth hooks and gane Hiv of the larva of Mydæa 
anomala Jaenn, Figs. 4—5 1' stage; the whole skeleton from the side and 
the anterior part from beneath; ek 6—7 2' stage, Figs. 8—9 3' stage. 
a hole. In the second stage, in which the larva is resting on its 
place in the tumor and in which it feeds on the blood of the host, 
the mouth hooks have changed into an instrument to irritate the 
wound, which forms the inner surface of the tumor. The dilatated 
end of the hooks are provided with strong spines and a prolonga- 
