AULACASPTS. 167 



antennas; formula (3, 6) 2, 1, 4, 5. The moult is 

 effected in the same way as in typical Diaspis. 



Pending the discovery of the male puparium I have 

 followed Mr. Morgan, and placed this somewhat 

 abnormal species in this genus. 



Habitat. On Gycas revoluta at Harrow (O'Brien). 

 Quite recently Mr. Watkins has sent me this species on 

 various species of palms from Clevedon. Gycas revo- 

 luta appears, however, to be its favourite food-plant, 

 and Dr. Leonardi says it is abundant on this plant in 

 Italy, presumably under glass. My description is from 

 specimens from the collection of Mr. J. W. Douglas. 



EXPLANATION OF THE PLATES. 



PI. XV, fig. 14. Insects natural size in situ on leaf of 



Cycas. 

 Fig. 15. Puparium of adult and immature female. 



X 15. 

 Fig. 16. Adult female after treatment with potash. 



X 45. 

 Fig. 17. Spiracles and glands of adult female. X 



600. 



PI. XVII, fig. 1. Pygidium of adult female. X 250. 

 PI. XVIII, fig. 4. Margin of pygidium of adult 

 female. X 600. 



GENUS AULACASPIS (Cockerell). 



Aulacaspis was separated by Cockerell from Diaspis 

 to include such forms as D. rosse, D. boisduvalii, D. 

 brometide, and all such species as possess a "very 

 strongly tricarinate " male puparium. A study of the 

 salient characters of the adult female of the species 

 here enumerated shows the division to be a most un- 



