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Douglas informs me that there are three British species, in which the male is black or marked with black bands, whilst the females are pale-coloured or obscure. The males in the three saltatorial families in this Order are remarkable for their musical powers, namely the Achetidae or crickets, the Locustidae for which there is no equivalent English name, and the Acridiidae or grasshoppers.
Landois also found such rudiments on the under surface of the wing-covers of the female Achetidae, and on the femora of the female Acridiidae.
Hence we may infer with confidence that the Locustidae are descended from a form, in which, as in the existing Achetidae, both wing-covers had serrated nervures on the under surface, and could be indifferently used as the bow; but that in the Locustidae the two wing-covers gradually became differentiated and perfected, on the principle of the division of labour, the one to act exclusively as the bow, and the other as the fiddle.
By what steps the more simple apparatus in the Achetidae originated, we do not know, but it is probable that the basal portions of the wing- covers originally overlapped each other as they do at present; and that the friction of the nervures produced a grating sound, as is now the case with the wing-covers of the females. Mr.
Acclimatisation, difference of, in different races of men. Achetidae, stridulation of the; rudimentary stridulating organs in female. Acilius sulcatus, elytra of the female. Acomus, development of spurs in the female of. Acridiidae, stridulation of the; rudimentary stridulating organs in female. Acromio-basilar muscle, and quadrupedal gait. Acting. Actiniae, bright colours of.
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