. The bee-keeper's guide : or Manual of the apiary . Bee culture; Bees. 78 THB beb-kbbpbr's guide ; long distances. This disproves the general view that insects can see but at very short range. Within the head is the large brain (Fig. 27, b), which will be described as we come to speak of the nervous system. There are also chitinous bars (Fig. 14) and braces within, which serve greatly to strengthen this portion of the insect. APPBNDAGBS OF THE THORAX. The organs of flight are the most noticeable appendages of the thorax. The wings are usually four, though the Diptera have but two, and some in
. The bee-keeper's guide : or Manual of the apiary . Bee culture; Bees. 78 THB beb-kbbpbr's guide ; long distances. This disproves the general view that insects can see but at very short range. Within the head is the large brain (Fig. 27, b), which will be described as we come to speak of the nervous system. There are also chitinous bars (Fig. 14) and braces within, which serve greatly to strengthen this portion of the insect. APPBNDAGBS OF THE THORAX. The organs of flight are the most noticeable appendages of the thorax. The wings are usually four, though the Diptera have but two, and some insects—as the worker-ants—have none. The front or primary wings (Fig. 2) are usually larger than the secondary or hind wings, and thus the mesothoracic Fig. L Muscles to raise front wing A Muscles of hind wing. Musckn of Thorax, after Wolff. D Muscles to lower front wing. or middle ring of the thorax, to which they are attached, is usually larger than the metathorax or third ring. The wings consist of a broad frame-work of veins (Fig. 2), covered by a thin, tough membrane. The main ribs or veins are variable in number, while towards the extremity of the wing are more or less cross-veins, dividing this portion of the wings into more or less cells. In the higher groups these cells are few, and quite important in classifying. Especially useful in group- ing bees into their families and genera are the cells in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cook, Albert John, 1842-1916. Chicago. Ill. : George W. York & Co.
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectbees, bookyear1910
