332 THE LIVING ANIMALS OF THE WORLD 



TWO-VVINGKD INSECTS, OR FLIES 



CICADA AND PVPJE 



Noled for the loud drummlnT sound produced by the mala 



BY W. F. KIRBV, K.L.S 



This order of insects is probably one of the 

 most numerous in individuals, though it may be 

 that, when we know more of the insect population of 

 the world, we shall find that it is outnumbered in 

 species by the Beetles or the order to which the 

 Bees and Ants belong. It differs from all other 

 orders in possessing only two wings instead of four, 

 which is the usual number in insects. The meta- 

 morphoses are complete, and the mouth is furnished 

 with a proboscis for imbibing liquid food. Hind wings 

 are represented in many species by a pair of organs 

 called " poisers," resembling a knob at the end of a 

 stick, and other species have two small additional 

 lobes attached to the wing, called " winglets " ; but 

 there is no such thing as a really developed hind 

 wing in any insect belonging to the group. They 

 are always two-winged flies, except in the case of a 

 few aberrant species, such as the Fleas, in which no 

 wings, or only mere rudiments of wings, are to be 

 met with. The Gnats, Daddy-long-legs, and House- 

 flies are among the commonest representatives of this 

 order. 

 The first section of the group includes the Gn.\TS and the D.\DDV-LONG-LEGS, or Cr.\NE- 

 FLlES.the members of which may be distinguished by having moderately long antenna;, composed 

 of more than six joints, and never terminating in a bristle. They are all vegetable-feeders, 

 with the exception of the females of gnats and sand-flies, which are furnished with a lancet- 

 like arrangement for sucking the blood of warm-blooded animals. 



The Gall-hjes, Wheat-midges, etc., have rather long, jointed antennae, which are not 

 feathered, though sometimes tufted on the sides, and their maggots produce small galls on 

 various trees and plants, or distort and otherwise injure them. They resemble small gnats, 

 and there are two particularly destructive species which attack corn in England and elsewhere, 

 — the Whe.\T-MII)GE, an orange-yellow fly with black eyes, which produces little yellowish or 

 reddish maggots which injure the growing grain in the ear; and the Hessiax Flv, which 

 is brown, and produces semi-transparent maggots, which afterwards grow darker, and when 

 full grown become pupae resembling flax-seeds. The maggots attack the 



stalk, feeding on the sap till the stalk cracks and bends o\er. This is an j 



infallible sign of their presence, and of the mischief the\- are doing. | 



Among the best-known insects of this group are the GNATS, or j 



Mosquitoes, of which there are many genera and species. There is no ■ 



difference, however, to permit of their being classified in two separate 

 popular categories. In England any of these troublesome insects are 

 called Gnats; out of I^ngland they are termed Mosquitoes, if we are 

 tormented b_\' them, even though they may belong to the same species 

 as the English ones — for " mosquito " is merely the Spanish word for j 



" gnat " Anglicised. ! 



Gnats breed in standing water, fresh or otherwise, but seem to prefer ph,,, by n'. p. ojnj,, f.z.h. 

 rain-water, for they are very numerous about small pools and water-butts. BROWN MOSQUITO 

 Consequently they were formerly far more abundant in England than at ^, , , ■ • r 



* ^ ^ ' ^ Ohier've the proboscis in /rent 



present, when the fens were still undrained, antl when every house had of the head 



