CHAP. XX. SCALE-INSECTS. 



131 



male, and Mytilaspis in the form of the scale of the female; in 

 most species, however, the scale of the female is wider than in 

 Mytilaspis. Example The Scurfy or Harris'-scale (Fig. 313). 



Fig. 313. 



Genus MYTILASPIS (Targioni Tozzetti). 



This genus includes species in which the scale of the female 

 is long, narrow, more or less curved, and where the exuviae 

 are at the anterior extremity. The scale of the male resembles 

 that of the female in form, but it can be readily distinguished 

 from it by its small size, and by its bearing but one larval 

 skin. In all the species of Mytilaspis which I have studied, 

 the posterior part (about one-fourth) of the scale of the male 

 is jointed to the remainder by a thinner portion, which serves 



