oa Journal of the Entomological Society of Southern Africa - Notes on acridid anatomy



In a previous paper (Ewer, 1954) it was shewn that the pterothorax of the last instar nymphs of certain acridids was equipped with muscles subsequently lost in the adult. It was further found that characteristic nymphal muscles also occurred in the first abdominal segment. It appeared of interest to discover whether the more posterior abdominal segments also possessed muscles peculiar to the nymph and to this end the musculature of the abdominal segments of nymphal and adult acridids of certain species has been studied. In the anterior region of the abdomen of certain Pyrgomorphinae there is a well developed repugnatorial gland. This occurs in both nymphal and adult instars. The muscular mechanics of this structure seemed worthy of study; the problem has already been examined by de Lotto (1950) and the present observations extend certain of his findings.


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