How Insects Affect Health in Rural Districts
How Insects Affect Health in Rural Districts
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Malaria-bearing mosquitoes. — There are very many mosquitoes which have not yet been proven to carry any disease. In fact, the majority of mosquitoes are supposed to be harmless except for the irritation caused by their punctures. The commonest of all forms belong to the genus Culex. These include the mosquitoes most commonly breeding in rain-water barrels and chance transient pools. Fig. 1 shows the difference between a harmless mosquito of the genus Culex and the malarious mosquito of the gen...us Anopheles. It will be noticed that Culex has clear wings, while Anopheles has wings which are more or less spotted. It will be noticed further that while the palpi (which are the projections either side of the beak) are very short in Culex, they are long — nearly as long as the beak — in Anopheles. Further, 155 Digitized by VjOOQ IC ^ Fia. 1.— Adults of Ciilex and. Anopheles : a, Cules aoUicitaiM; h, Anopheh'H jmnctipcnnts. Enlarged (author's Illustra- tion).
155 it has been ob- served that when Culex is i-esting upon a wall it ap- pears more or less humpbacked, that is to say, the head and the beak are not in the same plane with the body and wings, but project at an angle toward the surface of the wall, the body and wings being par- allel with the wall.
What to read after How Insects Affect Health in Rural Districts?
You can find similar books in the "Read Also" column, or choose other free books by Leland Ossian Howard to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Malaria-bearing mosquitoes. — There are very many mosquitoes which have not yet been proven to carry any disease. In fact, the majority of mosquitoes are supposed to be harmless except for the irritation caused by their punctures. The commonest of all forms belong to the genus Culex. These include the mosquitoes most commonly breeding in rain-water barrels and chance transient pools. Fig. 1 shows the difference between a harmless mosquito of the genus Culex and the malarious mosquito of the gen...us Anopheles. It will be noticed that Culex has clear wings, while Anopheles has wings which are more or less spotted. It will be noticed further that while the palpi (which are the projections either side of the beak) are very short in Culex, they are long — nearly as long as the beak — in Anopheles. Further, 155 Digitized by VjOOQ IC ^ Fia. 1.— Adults of Ciilex and. Anopheles : a, Cules aoUicitaiM; h, Anopheh'H jmnctipcnnts. Enlarged (author's Illustra- tion).
155 it has been ob- served that when Culex is i-esting upon a wall it ap- pears more or less humpbacked, that is to say, the head and the beak are not in the same plane with the body and wings, but project at an angle toward the surface of the wall, the body and wings being par- allel with the wall.
What to read after How Insects Affect Health in Rural Districts?
You can find similar books in the "Read Also" column, or choose other free books by Leland Ossian Howard to read onlineMoreLess
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