— 80 — 



D. Chitinous processes much elongated — Clirysomphahis. 

 DD. Chitinous processes smaller and shorter or wanting — 

 Aspidiotus. 

 BB. Scale of male white, delicate and carinated. 



C. Dorsal spinnerets irregular ; exuvia usually sub-centrai — Diaspis. 

 CC. Dorsal spinnerets in distinct bands ; exuvia terminal in 2nd 

 stage female and marginal in adult — Aulacaspis. 

 A A. Scale of female elongated with exuvia at one extremity. 



B. Scale of male similar to scale of female, but smaller ; five groups 



of gland-orifices — Lepidosaphcs. 

 BB. Scale of male white, small with parallel sides and carinated. — 

 Chionaspis. 



Chief Genera of the Coccinae. 



A. Naked or covered only by a filmy secretion. 



B. Flat or slig'htly convex ; dermis alveolate — Cacciis. 

 BB. Very convex, usually hemispherical ; hard when mature. 

 C. Dermis with coarse polygonal pitted areas — Saissetia. 

 CC. Dermis microscopically tesselate, or appearing smooth. — 

 Etilecaniwii. 

 AA. With a strong cottony secretion ; secreting an ovisac ; body more or less 

 chitinous without dorsal patches of secretion — Pulvinaria. 



Chief Genera of the Dactylopinae. 



A. Female globular or reniform in a hard shell ; larva fringed with spines — 



Kermes. 

 AA. Female not as above. 



B. Adult surrounded by secretion but dorsally naked — Gossyparia. 

 BB. Adult forming a cottony sac ; caudal lobe long — Eriococciis. 

 AAA. Female with soft powdery oval unarmored body — Pscudococcns. 



APHIDIDAE. 



Sub-Families and Chief Genera. 



Chief Sub-Families. 



A. Front wings with three discoidal veins ; antennae generally 6 or 7-jointed.. 

 B. Third discoidal vein of front wings twice forked — Aphidinae. 

 BB. Third discoidal vein of front wings once forked or simple — Pcm- 

 phiginac. 

 AA. Front wings with two discoidal veins ; antennae never more than 5-joint- 

 ed — Chermesinae. 



Chief Genera of the Aphidinae (tentative). 

 A. Antennae as long as the body. 



B. Honey tubes long; antennae not hairy. 



C. Frontal tubercles of antennae distinct and gibbous on inner side,. 



body covered with capitate hairs — Mysus. 

 CC. Frontal tubercles approximate — Nectarophora. 



