. A text-book of agricultural zoology. Zoology, Economic. ANATOMY OF AN AETHEOPOD. 91 wing-covers are movably united to the tergum or mesonotum. If we are examining Blatta orientalis we shall not observe these in the female, nor the second pair of wings. The metathorax bears .also a pair of thinner wings, the true organs of flight. The abdomen {Ab) is flattened dorso-ventrally. It is com- posed of ten distinct somites, the hinder ones being invisible, as they are pushed into the anterior ones. The upper parts of the segments are called terga (fig. 35, T). Of the ten, only eight can normally be
. A text-book of agricultural zoology. Zoology, Economic. ANATOMY OF AN AETHEOPOD. 91 wing-covers are movably united to the tergum or mesonotum. If we are examining Blatta orientalis we shall not observe these in the female, nor the second pair of wings. The metathorax bears .also a pair of thinner wings, the true organs of flight. The abdomen {Ab) is flattened dorso-ventrally. It is com- posed of ten distinct somites, the hinder ones being invisible, as they are pushed into the anterior ones. The upper parts of the segments are called terga (fig. 35, T). Of the ten, only eight can normally be seen, the eighth and ninth being hidden under the seventh. Situated at the side of the posterior ventral anus. A. B. Flo. 32,—A, Head, and b. Lower Lip or Cockroach. are a pair of small plates called the podieal plates. It is said that these represent an eleventh segment. They can easily be observed by raising the tenth tergum. On the tenth tergum are a pair of jointed processes called cerci (fig. 31, Ce). In the male a pair of styles are also borne on the ninth sternum (S). The sterna are the ventral plates, the ventral equivalents of the terga. The seventh in the female bears a process passing backwards, forming part of the large genital pouch. Appendages of the head.—On the head are placed the an- tennae and the mouth. The latter opens behind the labrum and between the jaws. The two antennse arise from two oval mem-. 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
