Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 332 AN ECONOMIC ENTOMOLOGY. Fig. 381. To the family Ctdicida; belong the mosquitoes, characterized by a slender body, long legs, long antennae, and a small head with mouth parts usually ex- tended to form a beak or pro- boscis. In the male the probos- cis contains a single lancet only, not fitted for puncturing animal tissues, and the antennre are plu- mose ; in the female a series of five slender, bristle-like lancets forms an effective piercing struct- ure, and the ante
Economic entomology for the farmer Economic entomology for the farmer and fruit-grower economicentomolo01smit Year: 1906 332 AN ECONOMIC ENTOMOLOGY. Fig. 381. To the family Ctdicida; belong the mosquitoes, characterized by a slender body, long legs, long antennae, and a small head with mouth parts usually ex- tended to form a beak or pro- boscis. In the male the probos- cis contains a single lancet only, not fitted for puncturing animal tissues, and the antennre are plu- mose ; in the female a series of five slender, bristle-like lancets forms an effective piercing struct- ure, and the antennae have the joints furnished with a few bristles only. The wings are slender and scaly along the veins. The species are quite numerous, and while most of them are pests of the first order, a few seem to feed on other than animal juices. The more common species be- long to the genus Culcx, in which the wings are unspotted, the palpi of the female are shorter than the beak, and the body is held parallel with the surface upon which the insects rest. The species of Anopheles are fewer in number, but are of relatively greater economic importance, because they have been proved to be intermediate hosts for the parasites causing '' malarial'' fevers. They are larger, as a rule, than C7ilex, the wings are more or less spotted, the palpi in both sexes are as long as the beak, the body is more linear and is held at an angle to the surface upon which it rests, the beak directed to a point almost midway between the fore and middle legs. Some of the species of Odex fly or allow themselves to be carried by the wind for long distances, so that they occasionally appear as pests many miles from any possible breeding-place. The mode of hibernation varies : in Anopheles and some Cidex the female adult survives ; in other species of Odex the eggs lie over in suitable localities, and in one instance at least the partly- grown larva lives through the winter. Larva and pupa of the Culex pungens, enl
Size: 1273px × 1571px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
