152 MORPHOLOGY AND TAXONOMY OF ADULT MALES 



reticulation in various regions of the body, but also by differences in the develop- 

 ment of certain ridges such as the midcranial ridge, the postoccipital ridge and the 

 median ridge of the mesobasisternum. 



Table 4 

 List of Characters which Separate Species 



Characters Erio- Pulvin- Partheno- Cero- 



peltis aria lecanium plastes 



1 . Degree of sclerotization of postero- 

 median part of postocular ridge. 



2. Presence of lateral arms of mid- 



cranial ridge. X 



3. Shape of apex of cranial apophysis. x 



4. Presence of reticulation on gena. X 



5. Presence of reticulation on pedicel. 



6. No. of fleshy setae between and 

 behind ventral eyes. 



7. No. of fleshy setae on 4th antennal 



segment. X 



8. Size of two shortest antennal bristles. x 



9. Presence of reticulation on the 

 post-tergital region. X 



10. Nature of emargination of 

 mesoprephragma. X 



11. Presence of reticulation on 



mesoprescutum. X - 



12. Presence of reticulation on anterior 



arms of mesoscutum. X - 



13. Presence of reticulation on 



membranous area of scutum. — 



14. Size of ventral foramen of scutellum. X 



15. Development of median ridge of 



mesosternum. X - - 



16. Length of hind leg in relation to 



body length. X 



