1. Eggs of Coccididæ.
2. Larva of Diaspidinæ.
3. Diagram of life-history of female Diaspidinæ. a, pellicle of larva; b, second pellicle; c, adult female somewhat shrivelled after egg-laying; d, eggs; e, secreted matter forming the "scale." In this diagram the scale is shown as overturned.
4. Types of various spinnerets. a, simple orifices (Mytilaspis); b, double orifice (Planchonia); c, multilocular orifice (Ctenochiton); d, multilocular orifice (Cœlostoma); e, simple protruding spinneret (Aspidiotus); f, serrated protruding spinneret (Mytilaspis drimydis); g, protruding spinneret (Acanthococcus); k, conical spiny spinneret and cottony secretion (Rhizococcus); m, lanceolate spinneret and glassy secretion (Inglisia); n, group of abdominal spinnerets, with detached orifices (Mytilaspis); p, double multilocular orifice (Cœlostoma); s, coronetted spinnerets and part of glassy secretion (Icerya).
5. Rostra. a, simple rostrum of Diaspidinæ; b, rostrum and trimerous mentum of Coccidinæ.
6. Foot of a female insect. c, coxa; tr, trochanter; f, femur; ti, tibia; ta, tarsus; cl, claw.
7. Foot of a male insect. The letters as in Fig. 6.
8. Foot with digitules, upper and lower.
9. Type of female antenna (Ctenochiton).
10. Type of female antenna (Dactylopius).
11. Type of antenna of larva (Icerya).
12. Type of male antenna (Fiorinia).
13. One joint of antenna of Monophlebidæ (Icerya).
14. Diagram of head of male of Lecanidinæ (after Signoret), both dorsal and ventral aspects being shown together. a, antennæ; e, e, true eyes, the lower pair being on the ventral surface in the place of the mouth; oc, oc, ocelli.
15. Head of male Icerya, with facetted eyes.
16. Wing of male insect. n, nervure.
A. D. WILLIS, WANGANUI, N. Z.
W.M.M., delt. ad. nat
PLATE I.
Plate II.
Fig.
1. Types of anogenital rings. a, Diaspidinæ; b, Lecanidinæ; c, Acanthococcidæ; d, Dactylopidæ; e, Monophlebidæ.
2. Types of last abdominal segments of female. a, Diaspidinæ; b, Lecanidinæ; c, Acanthococcidæ; d, Dactylopidæ; e, Monophlebidæ.
3. Types of last abdominal segments of male, and sheath of the penis. a, Diaspidinæ; b, Lecanidinæ (Ctenochiton); c, Acanthococcidæ; d, Lecanidinæ (Inglisia); e, Dactylopidæ; f, Monophlebidæ (Icerya).
4. Respiratory system. a, spiracle of Lecanium (after Targioni); b, spiracle of Coccus (after Targioni); c, diagram of arrangement of the four spiracles and the tracheal tubes (Lecanidinæ) (s. spiracles); d, spiracle and trachea of Cœlostoma.
5. Types of spines and hairs. a, anal serrated hairs (Aspidiotus nerii); b, spiracular spines (Ctenochiton); c, marginal spines (Ctenochiton); d, lanceolate marginal spines (Inglisia); e, spines on anal tubercles (Rhizococcus); f, marginal spines (Eriococcus); g, conical spines (Eriococcus); k, marginal hairs (Dactylopius); m, hairs (Icerya); n, anal hairs (Cœlostoma).