DR. D. SHARP, in his admirable work on "Insects" in the Cambridge Natural History, vol. v, gives (p. 247) some extraordinary particulars about the development of Mantis, with a figure taken mainly from Dr. Pagenstecher. I have just been observing the facts in the case of a mantis found here, and they do not, in all particulars, agree with Dr. Sharp's account, so that it seems desirable to draw attention to the matter. The eggs removed from the ootheca are elongated and similar to those of Acridiidae in general appearance ; the egg covering is quite strong but brittle. On removing the young from the o6theca, just before the time of hatching, they are found to be already attached by threads, as has been described by others.