A. D. WILLIS, WANGANUI, N. Z.

W.M.M., delt. ad. nat

PLATE II.

Plate III.

Types of Last Abdominal Segments of the Diaspidinæ.

Fig.

1. Aspidiotus coccineus (after Comstock); no groups of spinnerets.

2. Diaspis rosæ; five groups of spinnerets.

3. Mytilaspis cordylinidis; five groups of spinnerets and single orifices.

4. Mytilaspis pyriformis; five groups of spinnerets, almost forming an arch.

5. Chionaspis dysoxyli; five groups of spinnerets.

6. Poliaspis media; eight groups of spinnerets.

7. Fiorinia asteliæ; arch of spinnerets.

8. Fiorinia stricta; five groups of spinnerets, the three upper groups almost forming an arch.