Hamilton. — On Melicerta lingeas and Plumatelia repeus. 301 



a. Astero chiton lecanioides ... ... New Zealand. 



b. Astero chiton attreus ... ... New Zealand. 



e. Powellia vitreo-radiata ... - ... New Zealand. 



d. Powellia doryphora ... ... New Zealand. 



I have also three species of Hymenopterous insects parasitic on Homop- 

 tera, and belonging, as I think, to the genera DiajMa and Coccophagus. 



DESGEIPTION OF PLATE VII. 



Mytilaspis phymatodidis. 

 Fig. 1. Abdomen of female, magn. 200 diams. 



Mytilaspis metrosideri, 



2. Abdomen of female, magn. 200 diams. 



Poliaspis media, 



3. Abdomen of female, magn. 200 diams. 



4. Antenna of male, magn. 100 diams. 



5. Foot of male, magn. 100 diams. 



Cmlostoma zealandicum. 



6. Female, upper-side, magn. 2 diams. 



7. Female, under-side, magn. 2 diams. 



8. Female, foot, after treatment with potash, magn. 25 diams. 



9. Female, antenna, after treatment with potash, magn. 25 diams. 



10. Female, ovipositor, magn. 200 diams. 



11. Young insect, magn. 25 diams. 



12. Antenna of young insect, magn. 60 diams. 



13. Leg of young insect, magn. 60 diams. 



Eriococcus hoherice. 



14. Young insect, magn. 60 diams. 



15. Antenna of young insect, magn. 200 diams. 



16. Foot of young insect, magn. 200 diams. 



17. Female, magn. 25 diams. 



18. Antenna of female, magn. 200 diams. 



19. Foot of female, magn. 200 diams. 



20. Anal tubercles of female, magn. 90 diams. 



Art. XXXVIII. — On Melicerta ringens and Plumatelia repens 



By A. Hamilton. 



[Read before the Wellington Philosophical Society, 22nd November, 1879.] 



Having recently (September, 1879) had occasion to gather a few specimens 



of Myriophyllum from a swamp in the Petane valley, near Napier, I came 



across several interesting organisms, which I propose bringing under your 



