HEMIPTERA. 149 



adult the supplementary eyes which takes the place of the mouth parts is 

 not shown. 



The genera of the Diaspinae are characterized chiefly by the form 

 of the scales, and the position of the moulted skins or exuviae upon 

 them. In the use of these characters it is necessary to distinguish 

 the sex of the individual by which a given scale was made. This 

 can be done as follows: In the scale of the fully developed female 

 there are two moulted skins, while in that of the male there is but 

 one. Our genera can be separated by the following table :* 



V Scale of female circular with the exuviae either central or more or less 

 nearly marginal. 



B. Scale of male but little elongated, with the exuviae more or less central ; 

 scale usually resembling that of the female in color and texture (Plate 

 VII. Fi^. \a and 2<i). ASP1DIOTUS. 



BB. Scale of male elongated, with the exuviae at one extremity. 

 C. Scale of male, white and carinated (Plate VII. Fig. $a). Di 



CC. Scale of male, not white and with no central carina (Pl.iu- VII. 

 Fig. 6rf). PAR i \:>KIA. 



AA. Scale of female elongated, with the exuviae at one extremity. 

 I). Exuviae small. 



E. Scale of male, white and carinated t (Plate VII. Fis*. \a ) ; last 



segment of female with five groups of spinnerets. CHIONASIMS. 



EE. Scale of male white, but not carinated; female with eight groups 



ofspimu: PoLi.\-ris. 



ilc of male similar in form to that of the female (Plate VII. 



MY 1 1! iSPIS, 

 DD. Exuviae large. 



I Two moulted skins visible on the scale of the female (Plate VII. 



7,8). PAKI.AIOKIX. 



FF. Second skin covered by a secretion (Plate 1 Fig. 9). UHLERIA. 



Tin- accompanying illustrations, from my report on scale-in 



in the Report of tin- U. S. I)ept. of Agriculture l"i iSSo, will enable 



vc tin- m<nv important species of this sub-family. 



:ns. This is the largest gentlS of the Diaspin.. than 



, , .I in thr I 'nited States. The one 



\\hi- ! injury to citrus fruits on tin 



coast is the i 

 Clos d to this i, the Red Scale of Florida. ./. VI, 



U Sralr- 1 IIMM 1 1 1 in thr Sc, , .M.I Report 



Ithaca, N. Y., 1883. 



the Kale <! His species 



will- mia. 



