CHIONASPTS BTCLAVIS. 193 



back upon Cingalese material which Mr. Green very 

 generously placed in my hands. The illustrations from 

 exotic examples are duly acknowledged in the descrip- 

 tions of the plates. 



EXPLANATION or THE PLATES. 



PI. XXI, fig. 1. Insects natural size on branch of tea 



plant (Cingalese specimens, ex coll. E. E. Green). 

 Fig. 2. Portion of same branch magnified three 



diameters, showing parasitised, semi-detached, 



and perfect puparia, indicated thus ? . 

 Fig. 3. Puparium of adult female (detached) covered 



with epidermal layer of bark. X 1 5. 

 Fig. 4. Puparium of adult female (detached) with 



bark removed. X 15. 

 Fig. 5. Puparium of adult female (detached), 



ventral surface. X 15. 

 Fig. 6. Adult female after treatment with potash. 



X45. 

 Fig. 7. Rudimentary antennse of adult female. 



C X 600. 



Fig. 8. Tubular spinneret of adult female. X 600. 

 PL XXIII, fig. 1. Pygidium of adult female. X 250. 

 PI. XXVII, fig. 1. Margin of pygidium of adult 



female. X 600. 



GENUS MYTILASPIS (Signoret). 



The British species are distinguished by the mussel- 

 shaped puparium of the female; but several of the 

 exotic species construct long, narrow puparia, e.g. M. 

 cordylinidis, Maskell ; -M". ampelodesmae, Newstead, etc. 

 The larval exuvia3 are terminal; those of the second- 

 stage female are covered by a thick layer of secre- 

 tion, occupy about one-fourth of the entire puparium, 



13 



