74 



BRANCH ARTHROPODA. 



FIG. 125. 



Ce ci do my la de struct' or. 



Hessian-fly, a. Larva, b, Pupa. 



(Enlarged.) 



FIG. 126. 



The Hessian-fly deposits its eggs on the upper side of 



the leaves of grain, from whence 

 the larvse, on hatching, crawl to 

 the stem, where they nestle down 

 in the axil, stunting further growth 

 and rendering the joint so weak, 

 that a light storm destroys the 

 plant. 



The Mosquito deposits its eggs, 

 in boat-shaped clusters, upon the 

 surface of quiet water. The young 

 work themselves free, and in a 

 few days become what is known, 



from their peculiar mode of progression, as Wiggle-tails. 



These often come to the surface 



and take in air through a tube 



near the end of the body. 



Finally, after several moults, 



they cease to eat, come near the 



surface, and move only on be- 

 ing disturbed. This is the pupa 



stage. The back of the pupa 



finally splits open and the adult 



Mosquito crawls forth, resting 



on its cast skin, until its wings are dry and ready for 



flight. It is the female only that is provided with pierc- 

 ing and sucking organs. 



The House-flies are characterized 

 by their short antennae, and their 

 domes' tica. Maggot sucking and rasping mouth-parts. 



of House-fly. (Enlarged.) 



The footless young, known as Mag- 

 gots, are found in various decomposing animal and vege- 

 table substances. The Fly's foot is provided with a pair 



Uu' lex pip' i ens. Mosquito. Raft of 

 eggs. Larva, taking in air through its 

 tube, and Pupa, also taking in air. 

 (Enlarged.) 



FIG. 127. 



