. Smithsonian miscellaneous collections. sa~. 19.—The thoracic sterna of a cockroach, Blatta orientalis. A, general view of the three thoracic sterna and their paired apophyses. B,diagram of typical structure of a sternum. C, diagram of prosternum of , diagram of mesosternum of Blatta. Bs, basisternum; IS, first abdominal sternum; k, furcal suture; vS^, sternalapophysis; sa, external pit of sternal apophysis; SI, sternellum; spn, externalpit of spina; Ss, spinasternum; S, segmental sternum. characters, they are in many respects highly specialized insects adaptedto a particular kind of
. Smithsonian miscellaneous collections. sa~. 19.—The thoracic sterna of a cockroach, Blatta orientalis. A, general view of the three thoracic sterna and their paired apophyses. B,diagram of typical structure of a sternum. C, diagram of prosternum of , diagram of mesosternum of Blatta. Bs, basisternum; IS, first abdominal sternum; k, furcal suture; vS^, sternalapophysis; sa, external pit of sternal apophysis; SI, sternellum; spn, externalpit of spina; Ss, spinasternum; S, segmental sternum. characters, they are in many respects highly specialized insects adaptedto a particular kind of habitat, though to one almost universally dis-tributed. The flattening of the body has been accompanied by a struc-tural alteration in most of the under parts of the thorax, and there isevery reason to believe that the sterna, covered as they are by the basesof the legs, have become largely membranized to allow of an inflectionof their posterior parts. We should be on very unsafe ground, there-fore, if we take the fragmented condition of t
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Keywords: ., bookauthorsm, bookcentury1800, bookdecade1860, booksubjectscience
