118 ZOOLOGY. 



ravenous larvae. The larvae of the Seven-spotted and 

 Two-spotted Lady-birds, in particular (Coccinella 



Fig. 86. — The Seven-spotted Lady-bird (^Coccinella septempunctata) : 

 larvae, pupa?, beetles ; all natural size. 



septempunctata and G. bipunctata), are found in large 

 numbers among aphis colonies. The yellow eggs are 

 laid in heaps. 



Second Order : Orthoptera (Straight- winged 

 Insects). 



Insects with biting mouth parts and incomplete 

 metamorphosis (p. 89). Four wings, of which the 

 anterior are usually harder than the posterior ; hind 

 wings membranous, broader than the fore wings, and 

 folded like a fan. The Orthoptera feed entirely, or 

 almost so, upon vegetable substances. To this order 

 belong: — the Earwigs (Forficularice), which feed on 

 sweet fruits and flowers, and are sometimes very in- 

 jurious ; the Cockroaclies (Blattarice), which do much 

 damage to provisions in kitchens, stores, and on board 

 ship ; the Grasshoppers (Acrydites), to which, besides 

 the Migratory Grasshopper (Acrydium migratorium 

 (Fig. 62), various species of meadow grasshoppers 

 belong, which are quite harmless ; the Locusts (Locns- 

 tidcB), to which the well-known Green Locust (Locusta 

 viridissima) belongs ; and the Crickets (GryllidcB), to 

 which belong, among others, the House Cricket {Gryllus 

 domesticius), the quite harmless Field Cricket {Gryllus 

 campestris), and the Mole Cricket {Gryllotalpa vul- 

 garis). 



