A Preliminary Study of Kentucky Localities in Which Pellagra Is Prevalent, Having Reference to the Condition of the Corn Crop and to the Possible Presence of an Insect or Other Agent by Which the Disease Spreads
A Preliminary Study of Kentucky Localities in Which Pellagra Is Prevalent, Having Reference to the Condition of the Corn Crop and to the Possible Presence of an Insect or Other Agent by Which the Disease Spreads
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... and in fields, where they constitute an important element of the food of robins. The aquatic species are generally found among dead leaves and other vegetable refuse washed into streams, and probably obtain their food from such sources. The larvae collected near Cary are like other members of this ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... and in fields, where they constitute an important element of the food of robins. The aquatic species are generally found among dead leaves and other vegetable refuse washed into streams, and probably obtain their food from such sources. The larvae collected near Cary are like other members of this family of flies, soft-bodied, leathery-skinned, cylindrical, dull-gray grubs, with a rather small head more or less completely withdrawn and concealed in the first body segment. The body is deeply and simply wrinkled, each division with a few short erect black hairs, in pairs. Obscure tubercular prominences become more pronounced on the ventral sides of the somites, the last one of which bears three pairs of fleshy, unjointed, dusky appendages, as follows: A pair of short ones on the dorsal side; a pair of longer ones, one on each side of the dorsal pair, with a tuft of black hairs at the tip of each and a couple of small tubercular offshoots; a third still longer pair projecting downward and backward, each bearing a tuft of radiating black hairs at the tip and with two small tubercles. A pair of eye-like structures is conspicuous at the back of the short dorsal pair of appendages. The under side of the posterior somite bears six soft contorted appendages. Length of largest example 20 mm. Fig. 20.--Pupa of yellow fever mosquito, ventral and side views, x 14%. TABANID/E (GADFLIES). Tabanus sp.--A larva of one of these stinging flies was taken in the Left Fork of Straight Creek near a dwelling occupied by people suffering with pellagra. The strongflying adults produced from such grubs are known as gad flies, and are common pests of stock, attacking especially horses and cattle, but not neglecting even hogs, and now and then venturing upon man...
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