Abstract
ABSTRACT. Removal of the antennae from Schistocerca gregaria early in the third or fourth instar resulted in fifth instar nymphs with a green haemolymph and cuticle. Antennectomized adults had a lower somatic dry weight and a smaller fat body than operated control insects. In addition, their rate of sexual development increased and some of their morphometric parameters were altered. Implantation of corpora allata into fourth instar nymphs induced a green coloration of the haemolymph after a few days. It is suggested that antennectomy of Schistocerca nymphs resulted in an increased effectiveness of the corpus allatum hormone with its concomitant effects on nymphal pigmentation, growth and development, and adult morphometries. It is further suggested that antennectomy of crowded locusts may mimic, for them, the uncrowded condition, by reducing sensory input.
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