ANATOMY AND PHYSIOLOGY 



sent special modifications. A pharyngeal pumping apparatus 

 is present, which is similar in its general plan to that of Lepi- 

 doptera and Diptera, as presently described, though it differs 

 as regards the smaller details of construction. 



FIG. 50. 



^^s^ 



A D 



Mouth parts of a hemipteron, Benacus griseus. A, dorsal aspect; B, transverse sec- 

 tion; C, extremity of mandible; D, transverse section of mandibles and maxillae; c, 

 canal; I, labrum; li, labium; m, mandible; mx, maxillae. 



Lepidoptera. In Lepidoptera, excepting Eriocephala, the 

 labrum is reduced ( Fig. 51) and the mandibles are either rudi- 

 mentary or absent (Rhopalocera). The two maxillae are rep- 

 resented by their galeae, which form a conspicuous proboscis; 

 the grooved inner faces of the galeae (or laciniae, according to 

 Kellogg) form the sucking tube, which opens into the oesoph- 

 agus. The labium is reduced, though the labial palpi (Fig. 

 52) are well developed. The so-called rudimentary mandi- 

 bles of Anosia and other forms have been shown by Kellogg 

 to be lateral projections of the labrum (Fig. 51) and he terms 

 them pilifers. 



