 | James Duncan - 1840 - 468 pages
...membranous scales applied with their faces to each other, which are named wing-scales, alulets, or winglets. They are sometimes of considerable size, and doubtless...and slender, the articulations of the tarsi always fire in number. The terminal joint, or that which bears the claws, is often provided with two or three... | |
 | James Duncan - 1860 - 568 pages
...scales applied with their faces to each other, which are named wing- scales, alulets, or winglets. They are sometimes of considerable size, and doubtless...its segments from five to nine. In the females it frequent!}' terminates in a tubular ovipositor, the joints of which are retractile within each other.... | |
 | Charles Knight - 1867 - 556 pages
...triangle pointing towards the head. The abdomen is composed of six or seven distinct segments, and is attached to the thorax only by a small portion of its diameter. There are only two kinds of individuals, males and females. The principal modifications of... | |
 | Charles Knight - 1867 - 556 pages
...triangle pointin, towards the head. The abdomen is composed of six or seven distinct segments, and is attached to the thorax only by a small portion of its diameter. There are only two kinds of individuals, males and females. The principal modifications of... | |
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... alulets, or winglets. They are sometimes of considerable size, and doubtless aid the movements of the wings materially in the act of flying. The use of the halteres, which have been already alluded to as two slender clubbed bodies placed behind the... 