Ill] 



SOME SUCKING INSECTS 



21 



the epidermis beneath the cuticle, as shown by 

 E. O. Schmidt for Aspidiotus (1885). The penulti- 



Fig. 7. Mussel Scale-insect (Mytilaspis pomorum). a, male; fo, foot 

 of male; c, larva,, ventral view; c/, feeler of larva; e, female, 

 ventral view. After Howard, Yearbook U.S. Dept. Agric. 1904. 

 Magnified, a, c, e x 20; 6, d x 120. 



mate instar of this sex in which the wing-rudiments 

 are visible externally lies passively beneath the scale, 



