260 



ELEMENTARY STUDIES IN INSECT LIFE 



Make a drawing of the labimn, and name the parts 

 apparent with the lens in use. 



Hypopharynx. - The hypopharynx, marked in Fig. 

 209 H, situated between the maxilla and arising from 

 the back wall of the mouth, may be readily made out. 



THORAX. 



The thorax consists of three divisions : the prothorax, 

 bearing the front pair of legs ; the mesothorax, bearing 

 the front wings and the middle pair of legs ; the meta- 

 thorax, bearing the hind wings and the last pair of legs. 



Prothorax. 



The prothorax is made most conspicuous by the pro- 



notum, the large sunboimet- 

 shaped piece covering the 

 dorsal portion of the thorax 

 and extending back over the 

 mesothorax and enveloping 

 the lateral portions of the 

 prothorax. This pronotum is 

 divided into four parts, be- 

 ginning with the cephalic or 



FIG. 198. side view of prothorax front part. They are named 



(Fig. 198): a, pnrscutum ; 

 &, scutum ; c, scutellum ; d, 

 post scutellum. 



Just beneath, or ventrad of 

 the scutellum, is a small tri- 

 angular piece called the epi- 

 sternum of the prothorax. The under and ventral por- 

 tion of an insect is spoken of as the sternum; the side 



with leg. a, prsescutum ; b, scutum ; 

 c, scutellum; d, post scutellum; e, 

 episternuru ; m, membrane, con- 

 necting head with prothorax, con- 

 taining the jugular sclerites ; /, 

 coxa of leg ; 0, trochanter ; ft, fe- 

 mur ; i, tibia ; j, tarsi ; fc, pulvillus 

 and two claws. Enlarged three 

 times. 



