258 



ELEMENTARY ZOOLOGY. 



1 . The three main regions of the body and the degree 

 of their development. 



2. The antennae and mouth parts, and the kind of work 

 they are adapted to (Figs. 102 and 103). 



D 



FIG. 103. Mouth parts of a female mosquito. A, dorsal view; B, transverse section. 

 a, antenna; e, compound eye; k, hypopharynx; /, labrum; It, labium; m, mandible, 

 mx, maxilla. C, end of maxilla enlarged; D, end of /, enlarged. After Dimmock, from 

 Folsom. 



Questions on the Figure. What are these mouth parts adapted, 

 to do? Study the cross section in determining something of the 

 function of each part. Compare these parts with the corresponding 

 parts in the cockroach and enumerate the differences. 



3. The degree of development of the three pairs, of legs 

 and the way they are used. 



4. The number, size, structure, and position of the- 

 wings, with a comparison of the first and second pairs. 



