Prof. cockerell's treatment of these genera is likely to create an erroneous impression, which should be corrected wherever his statements are made. In Trans. Am. Ent. Soc., XXIV., 150, he says : “It is perfectly evident that the so-called species of Panurgus of North America are not all of the same genus.” In the Dec. Can. Ent., p. 287, he says : “The result is extremely interesting, and seems to show that we have for many years been placing bees in genera to which they by no means belong.”