. Transactions of the Entomological Society of London . ^Blatta, sp. The ninth sternum of the male : st, the sternum,which is colourless, or nearly so, and, when in situ, covered bythat of the preceding somite ; the coloured and setose portionposterior to it represents the bases (protopodites) of the mem-bers which have coalesced with the sternum and with oneanother at p in the middle line, where a narrow streak oflighter coloration than the surrounding chitine marks thejunction ; a, the exopodites ; the endopodites (h in fig. 5) havebeen lost in the coalescence of the basal joints of the memb
. Transactions of the Entomological Society of London . ^Blatta, sp. The ninth sternum of the male : st, the sternum,which is colourless, or nearly so, and, when in situ, covered bythat of the preceding somite ; the coloured and setose portionposterior to it represents the bases (protopodites) of the mem-bers which have coalesced with the sternum and with oneanother at p in the middle line, where a narrow streak oflighter coloration than the surrounding chitine marks thejunction ; a, the exopodites ; the endopodites (h in fig. 5) havebeen lost in the coalescence of the basal joints of the memberswith one another ; jjI, lateral sclerites apparently homologouswith those which carry the spiracles in the spiraculiferoussomites of the body. hearing on the origin of 5. 163. Fig. 5. Lej/isma, sp. The appendages of the ninth abdominal somite inthe male : p, the coalesced basal joints (protopodite) of one sidecarrying two branches, a, the exopodite, and b, the unmodifiedendopodites, which, with its fellow, answers to the posterior ele-ments of the ovipositor in the female, but which is lost in thesame segment in male Blattida in the coalescence of the twoprotopodites with one another and with the sternum (fig. 4);these endopodites are unquestionably represented in the pre-ceding somite by a pair of whisps of long seta^, which whispshomologize with the more mesial of the two pairs of fringesof stiff yellow seta; in the somites anterior to the eighth, fromwhich we may confidently infer that the ancestors of Lepismapossessed two-branched appendages, like those of the ninth, toall the somites of their alnlomen. The sternum and the basal parts of the protopodites are notshown in the figure. 164: Prof. J. Wood-Masons Morphulogic<d Notes Fitr. 6.
Size: 1463px × 1707px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorr, bookcentury1800, booksubjectentomology, bookyear1836
