. Biology. Biology. j£~..__. LABRUM r~^_ J1ANDIBLE. _ MAXILLA m\ MY POP/IARYN)L _ . -PARA&LOSSUS A4_ MAXILLARY PALP ^< CAR DO. __ '-SUB MENTUN B. FIG. 82.—Homologous mouth parts of cockroach (left), bee (center) and mos- quito (right). (Combination of figures from Hertwig.) The thorax of the cockroach consists of three fused somites, termed the pre-, meso-, and meta-thorax, and, as in the lob- ster, it bears the most important organs. Each somite carries one pair of legs, and these three pairs of legs are so constant in the insects that the phylum is sometimes called the Hexapo
. Biology. Biology. j£~..__. LABRUM r~^_ J1ANDIBLE. _ MAXILLA m\ MY POP/IARYN)L _ . -PARA&LOSSUS A4_ MAXILLARY PALP ^< CAR DO. __ '-SUB MENTUN B. FIG. 82.—Homologous mouth parts of cockroach (left), bee (center) and mos- quito (right). (Combination of figures from Hertwig.) The thorax of the cockroach consists of three fused somites, termed the pre-, meso-, and meta-thorax, and, as in the lob- ster, it bears the most important organs. Each somite carries one pair of legs, and these three pairs of legs are so constant in the insects that the phylum is sometimes called the Hexapoda. These legs are adapted for many different activities. The thorax also carries the wings. These are thin bags of cuticle drawn out from the dorsal angles of the meso- and meta- thorax, which become expanded and stiffened in the air, and are the most characteristic of the external appendages of insects, distinguishing them from all other animal forms. The wings, like other appendages, are also subject to wide variations in form and 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 Calkins, Gary N. (Gary Nathan), b. 1869. New York, H. Holt and company
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