OF PSEUDOCOCCIDAE & ERIOCOCCID A E 



9i 



Table I 

 Data of the species of Pseudococcidae prepared for plotting 



Latent root 



1 



II 



III 



% of variance (Trace) 



29-4i°o 



i5-96°o 



n-33% 



Integral number added to make the latent 

 values positive. 



4 6 



~5 



1-6 



Species 





Latent values 





1 



P. citri 



2 



P. kenyae 



3 



P. dioscoreae 



4 



P. ireneus 



5 



N. vastator 



6 



N. nipae 



7 



M. hirsutus 



8 



F. virgata 



9 



T. newsteadi 



10 



P. obscurus 



11 



P. "maritimus A 



12 



P. citriculus 



13 



P. adonidum 



M 



P. fragilis 



15 



D. alazon 



16 



S. sacchari 



18 



O. africanus 



19 



C. pilosellae 



JO 



C. insolitus 



21 



N. bifrons 



642 



2-18 



516 



613 



2 05 



6-59 



5 98 



1 06 



689 



538 



1-48 



502 



698 



1-3* 



617 



8-17 



029 



5 96 



497 



335 



652 



613 



672 



232 



618 



306 



7-M 



327 



5-i8 



681 



213 



705 



617 



141 



751 



650 



052 



7 94 



614 



o-55 



7-82 



709 



1 69 



743 



588 



456 



474 



374 



1 1 08 



5 4° 



327 



1 3 62 



7-31 



8-94 



11-51 



831 



12-87 



1333 



981 



084 



Results 



The results of the Principal Component analyses are shown in Figs. 1, 2 and 3. 

 In Fig. 1, in which all species were considered (including the apterous forms), the 

 macropterous forms are situated in the upper part of the diagram, and except 

 S. sacchari (16) above the third level, while the two apterous forms (S. sacchari, 

 17 and P. fraxini, 29) near the base, below the second level. This is attributed to 

 the fact that these males, unlike the apterous males of other families (e.g. 

 Diaspididae, Ghauri 1962) are greatly degenerate and have lost most of their 

 morphological structures. They show considerable differences as compared with 

 the macropterous forms even of the same species. It has been decided therefore 

 to exclude these two species, and another set of calculations for the macropterous 

 males only was made ; the results are illustrated in Fig. 2. The two diagrams are 

 virtually identical as far as the relative position of the species are concerned, except 

 for S. sacchari (16) whose position is closer to Planococcus group (spp. 1-9). The 

 relative position of the species, as shown in Fig. 2, will be discussed in greater detail 

 since it appears to illustrate the relationships more clearly. Pseudococcidae (1-21) 

 are well separated from Eriococcidae (22-29) by a vertical place passing diagonally 



