. A manual of elementary zoology . Zoology. INSECTS 275 in Fig. 177. The third and fourth joints bear bristles which are used in cleaning the body, and the last joint bears two hooked claws used in climbing and between the claws a pad or pulvillus which prevents slipping. The meso- thorax and metathorax bear each a pair of wings jointed to the anterior corners of the notum. The wings are membranous folds of the cuticle strengthened by ridges known as nervures. The first pair are dark-coloured and horny and form a cover for the second, which, when they are at rest, are folded lengthwise and lai
. A manual of elementary zoology . Zoology. INSECTS 275 in Fig. 177. The third and fourth joints bear bristles which are used in cleaning the body, and the last joint bears two hooked claws used in climbing and between the claws a pad or pulvillus which prevents slipping. The meso- thorax and metathorax bear each a pair of wings jointed to the anterior corners of the notum. The wings are membranous folds of the cuticle strengthened by ridges known as nervures. The first pair are dark-coloured and horny and form a cover for the second, which, when they are at rest, are folded lengthwise and laid along the back. In the female of P. orientalis the wings are very small. Wings are not appendages of the same kind as the limbs, but movable expansions of the terga. The abdomen con- sists of ten Abdomen. segments, each with a tergum and a sternum, joined at the sides by soft cuticle. The hinder segments are telescoped, so that the eighth and ninth ew. Fig. —The head of a cockroach, seen from in front. at,, Antenna; dp., clypeus ; ecr., epicranium ; eye;/en., fenestra; gen., gena; Ibm., part of the labium ; , labial palp ; Ibr., labrum; md., mandible; mx., part of the maxilla; , maxillary palp; sut., 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 Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
