()!■• THE FAMILY COCCIDAE 



147 



parently be used to separate both genera and species within the same group ; a 

 dash ( — ) signifies that the character does not operate in that particular group. 

 The table contains about go characters. This very high number is due to the fact 

 that in most cases only one species per genus was available and many characters 

 may eventually be shown to be of specific value only. 



Table 3 

 List of Characters which mainly Separate Genera 



Characters Eulec- Krio- Coccus 



anium peltis 



Head: 



1 . Shape of the head. g <. 



2. Absence or presence of polygonal reticulation 

 mi median crest. 



3. Presence of interocular ridg 



4 Nature of postocular ridge, dorsally. 



5. Nature of postocular ridge, posteromedial^ 

 (>. Midcranial ridge dorsally represented or not. 



7. Nature of scleroti/.ation and reticulation 

 around ventral part of midcranial ridge. 



8. Nature of preocular ridge. 



9. Number of simple eyes. 



10. Distance between dorsal eyes in relation to 

 diameter of cornea. 



1 1. Distance between ventral eves in relation to 

 diameter of cornea. 



12. Presence of preoral ridge. 



14. Length of cranial apophysis. 



15. Nature of apex of cranial apophysis. 



16. Presence of polygonal reticulation on genae. 



17. Presence of a pair of long, median, hair-like, 

 ventral head setae. 



13. Presence of ventral sclerite near mouth opening. g 



gs 



s 

 GS 



18. Location of ventral head setae. 



