Similar observations were made regarding forms recessive to _multitaeniata_ Stål. Of these two were thrown by _multitaeniata_ itself, namely a form named by Stål _melanothorax_, and regarded by him as a species, and one which Tower names _rubicunda_ n. sp. The facts proving the recessive behaviour of their several forms will be found in the following places in Tower's book: _pallida_, pp. 273-278. _melanicum_, p. 279. _tortuosa_, p. 280. _rubrivittata_, pp. 280-281. _melanothorax_ and _rubicunda_, pp. 283-285. Following this evidence of recessive nature of the six forms enumerated, Tower describes experiments showing, as he believes, that some of them may be caused to appear by applying special treatment to the parents during the "growth and fertilisation" (p. 287) of the eggs. The most striking example is that in which 4 males and 4 females of _decemlineata_ were kept very hot (average 35° C.) and dry, and at low atmospheric pressure (19-21 inches). The eggs laid were restored to natural conditions. These gave 506 larvae, from which emerged 14 normal, 82 _pallida_ and 2 "_immaculothorax_," viz., without pigment on the pronotum. The account of the rest of the experiment is somewhat involved, but I understand that the _pallida_, of which two only survived, behaved as normal recessives when bred to the type: also that the parents, after having laid the eggs whose history has been given, were restored to normal conditions and laid 319 eggs which gave 61 normals. In another case normal parents laid 409 eggs in the hot and dry conditions, and on restoration to normal conditions, the same parents laid 840 eggs. Then 409 eggs gave 64 adults as follows: _Males_ _Females_ _decemlineata_ 12 8 _pallida_ 10 13 _immaculothorax_ 2 3 _albida_ 9 7 --- --- 33 31 The 840 eggs laid in normal conditions gave 123 normal _decemlineata_. Similar experiments were made with _multitaeniata_ and gave comparable results, the two recessives (_melanothorax_, _rubicunda_) being produced in large numbers when the parents were subjected to heat, but in this case the atmosphere was kept _saturated_ with moisture, instead of dry, as in the previous instance. The same parents transferred to normal conditions gave normals only. Lastly the form _undecimlineata_ was exposed "to an extreme stimulus of high temperature, 10° C. above the average," and a dry atmosphere, with the result that from 190 eggs there emerged 11 beetles, all of the form _angustovittata_ Jacoby, which subsequently bred true to that type (see p. 295).