i6 



ELEMENTARY ENTOMOLOGY 



very distinct types, entirely dissimilar in structure and origin, 

 resembling each other only in that they enable the insect to suck 

 or lap its food rather than to bite it. 



FIG. 17. Cross section of proboscis of cotton-worm moth, showing concave inner 



faces of maxillae locked together to form the sucking tube 



(After Comstock) 



J) 



FIG. 18. Mouth-parts of female mosquito ( Culex pipien s) 



A, dorsal aspect; B, transverse section; C, tip of maxilla; D, tip of labrum-epipharynx ; 



a, antenna ; e, compound eye ; Si, hypopharynx ; /, labrum-epipharynx ; /, labium ; mv, 



maxilla ; m, mandible ; /, maxillary palpus. (After Folsom and Dimock) 



