84 Mytilaspis. 



Anal aperture close to base of pygidium ; genital aperture below lower gland 

 groups. Length i to i"25 mm. ; breadth less than half a millimetre. 



Adult male not observed in Ceylon. Prof. Comstock figures it (from 

 America) as of the normal form, with the parts anterior to the insertion of the 

 wings very long. 



Eggs at first white, afterwards tinged with purple ; arranged regularly and 

 symmetrically in two rows beneath the scale {fig. 3). Although this species is 

 distinctly oviparous, I have noticed well-developed embryos in the bodies of 

 some of the females. Possibly, after depositing a certain number of eggs, a 

 few living young may be directly produced. 



Habitat. — I have received this species from Kandy in January, upon leaves 

 and young stems of orange trees. 



This species may be distinguished from citricola by the narrower and 

 straighter puparium of the female, by the median longitudinal division in the 

 ventral scale, and by the arrangement of the eggs beneath the scale. It is more 

 difficult to point out specific differences in the anatomical structure of the 

 insect itself, but the elongated mesothorax may be of assistance in discrim- 

 inating between the species. The abdominal segments in gloverii bear only 

 two or three marginal spines, while four or five are found in citricola. These 

 several differences, though small, appear to be constant. 



EXPLANATION OF PLATE XXII. 



Mytilaspis gloverii. 



{All figures., except No. i, more or less enlarged!) 



Fig. I. Orange leaf, with insects iti situ., nat. size. 



2. Female puparium, from above. 



3. „ „ from below. 



4. Male puparium, from above. 



5. „ „ from below. 



6. Adult female, ventral view. 



7. Second pellicle of female puparium. 



8. Pygidium of female, ventral view. 



