GENERAL CLASSIFICATION 143 



Order 2. — Dipterous Insects. 



An unjdnted proboscis, straight or elbowed, sometimes retractile. 

 Two naked, membranous, veined wings ; two balancers ; larva worm-like, 

 usvaUy without legs. 



Hippobosca (horse-fly). — 



Oestrus. Stomoxis. 



— Myopa. 

 Stratiomys. Conops. 

 Syrphus (hover-fly). Empis. 

 Anthrax. Bombylus. 

 Fly. Asilus. 

 Tabanus (gad-fly). Tipula (crane-fly). 

 Rhagio. Simulium (sand-midge). 



— Bibio. 

 Gnat. 



Order 3. — Hemipterous Insects. 



Sharp, jointed beak, curved under the breast, serving as a sheath for a sucking- 

 tube of three setae. 



Two wings hidden under membranous elytra ; larva hexapod ; the pupa walks 

 and eats. 



Dorthesia. Pentatoma. 



Cochineal insect. Bed-Bug. 



Psylla. Coraeus. 



Plant-louse. Reduvius. 



Aleyrodes. Hydrometra. 



Thrips. Gerris. 



Cicada. Nepa (water-scorpion). 



Fulgora. Notonecta (water-boat- 

 Tettigonia. man). 



— Nancori'. 

 Scutellera. Corixa (water- bug ) . 



Order 4. — ^Lepidoptbrous Insects. 



Sucking tube in two pieces, without a sheath, resembling a tubular proboscis, 

 and rolled spirally when not in use. 



Four membranous wings, covered with coloured and flour-like scales. 

 Larva with eight to sixteen legs ; motionless chrysalis. 



(1) Antennae subulate or setaceous [moths. H. E.]. 



Pterophorus. Alucita. 



Omeodes. Adella [Trichoptera. H. E.]. 



Cerastoma. PyraUs. 



Tinea. — 



Noctua. Hepialus. 



Phalaena. Bombyx (silk-worm). 



(2) Antennae swollen at some part of their length. 



Zygoena (bumet-moth). Sphinx (hawk-moth). 



Butterfly. Sesia (clear-wing). 



