Mr. Grote's remark (Can. Ent., XXVIII., p. 294) that the stinging spines of Hemileuca and Automeris mar have been separately evolved is not in accordance with my views, and I wish to compare his genealogical tree of the Saturnians with the larval characters more at length than was possible in the review of his paper, “Die Saturniideu.” I reproduce first his tree: At I there is a dichotomous division, the genera on the right having vein IV2 in the middle of the cell or but slightly moved (generalized); those on the left with vein IV2 considerably moved toward IV1. It is not proved that this movement of IV2 took place only once in the Saturnians, but it is so assumed, and the construction of the tree depends upon the assumption.