ENEMIES OF APHIDES. 



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f COLEOPTERA, 



I including Strepsiptera 

 I Orthoptera, 

 j including Thyanura. 

 -| Neuropteka, includ- 

 I ing Trichoptera, 

 I Thysanoptera, etc. 

 I Hymenoptera. 

 1 Mallophaga. 



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Lepidoptera. 

 Diptera. 



Hemiptera. 



Aphaniptera. 



Anoplura. 



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I 



f Cicadidae 

 j Cercopidae. 

 I Psyllidce. 



Sub-order, -^ 



Homoptera | Aphididae. 



i^Coccidae. 



f Pentatomidae 

 I Coreidae 

 I Berytidae 

 I Lygeidse. 



Reduviidae. 



Saldidae. 



Tingididas. 



Aradidae. 



Cimicidae. 



Capsidae. 



Hebridae. 



Hydrometri- 

 Sub-order, dae. 



Heteroptera-| Naucoridae. 

 I Nepidae. 

 I Notonectidae 

 l^ Corixidae. 



Kirby, in his Entomology, has defined the Hemiptera as " haus- 

 tellate insects, wings four, membranous, naked. The fore-wings 

 (in the Heteroptera) of a parchment-like consistency (^except 

 sometimes at the tips), or (in the Homoptera) similar to the hind 

 wings ; metamorphosis incomplete ; and in one group (Aphides) 

 exhibiting alternation of generations." The He7niptera-Ho7nop- 

 tera he defines as follows : — " Fore-wings horny ; hind wings and 

 usually the tips of the fore-wings membranous; antennae usually 

 long, 4 or 5 jointed ; head generally free." 



This division includes the true Bugs, an extensive group of 

 very varied structure and habits. The greater part of the terres- 

 trial species feed on plants. A few, however, are carnivorous, 

 feeding on other insects or sucking the blood of animals and birds, 

 and most of the aquatic species are likewise carnivorous. Kirby 

 divides the sub-order into 15 families : — 



International Journal ok Microscopy and Natural Science. 

 Third Series. Vol. VI. L 



