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Zeitschrift für Wissenschaft Zoolog. Vol. 22. 1872

p. 100 Dr. V. Graber, "Ueber der Tonapparat der Locustiden, ein Beitrag zum Darwinismus.

p. 103 slight differences in the nervure of wings & speculum of the different species, but typical structure very similar.

p. 105. By no means always is there the difference between right & left wings of the Locustidae which might have been expected, from their rubbing right wing over left.

p. 106. thinks aboriginally there & L. wings were alike, & that the Locustidae are the modified descendants of the Achetidæ (my view). (*Ephippiger makes as loud a noise with the right as with left wing)

p. 109 number of teeth of the strid. organ only variable in some species.

Their teeth graduate into the scales & homologous hairs which cover the wings (have I not given this view with Beetles)

(109. Hence parents of the Locustidae were once dumb)

p. 110 Thinks friction (& advances good reason for belief)

(good) of one wing over the other stimulate the development of the teeth on the parts thus subject to friction.

p. 111 112} On Ephipp. vitium besides the main stridulating teeth, there are similar small ones on other nervure of the wings.

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p. 114 with most Locustidae there are traces of strid: organs on wings of female.

In Ephippi vitium the nervure differs much in the 2 Sexes. Though the ♀ has not the main

stridulating organ, or nervure with teeth other nervure on the wings are thus provided & are better developed than in the ♂. Therefore the apparatus cannot be (p. 115) considered as rudimentary in the ♀; nor can it have been derived by transference from the ♂. It must be an independent development in the ♀ (& the sound probably is of important service (as with beetles) for the 2 sexes meeting.

p. 115 In Odontura Fischeri the peculiar structure of the wing of ♀ is equally opposed to strid. organ. havng been derived by transference from ♂.

p. 116 In some other sp. of Odontura rudiments of the strid. organ seem to have been transferred from ♂ to the ♀. In the ♀ the organ consists of only 6 or occasionally some more teeth & these are sometimes developed on one wing & sometime on the other of the ♀.