without some interest. What is the object of these apterous individuals? In most cases it would appear that their organs, excepting the wings, are fully developed: in Eriococcus hoheriæ there seems to be something wanting, but its generative organs are apparently perfect. Leachia zealandica and Gossyparia ulmi exhibit very small rudimentary wings, which must be quite useless for flight. I have included both in the following list, which gives all the apterous males that I know of at present; also Lecanium hesperidum, although I have not yet been able to procure the full text of M. Moniez's paper, and have only gathered from a summary of it that the male is never winged. Species. References. A. Sometimes totally apterous: Aspidiotus (?) sabalis, Comst. Comstock, 2nd Cornell University Report, 1883, p. 67. Chionaspis salicis, Linn. Bouché, Stett. Ent. Zeit., 1884, p. 294. Löw, Wiener Ent. Zeit., II., 1883. Chionaspis fraxini, Signoret(= C. salicis ?) R. Newstead, in lit. Chionaspis alni, Sign. R. Newstead, in lit. Chionaspis dysoxyli, Mask. Maskell, N.Z. Trans., vol. xxii., p. 136 Leucaspis pusilla, Löw Löw, Wiener Ent. Zeit., II., 1883. Lecanium hesperidum Moniez, Comptes Rendus de l'Acad. des Sciences, Feb., 1887. Eriococcus (Acanthococcus) aceris. Sign. Löw, Wiener Ent. Zeit., II., 1883. Eriococcus hoheriæ, Mask. The present paper. B. Sometimes with rudimentary wings Gossyparia ulmi, Geoffroy Signoret, Essai, p. 320. Howard, “Insect Life,” Aug., 1889. Leachia zealandica, Mask. The present paper. As regards the time of the year at which these apterous males emerge, I find that it varies considerably. Mr. Newstead tells me that C. salicis and C. alni came out in England in July (summer); Mr. Howard states that G. ulmi appeared about the 1st May at Washington (spring); here in New Zealand E. hoheriæ appeared in May (autumn), C. dysoxyli from February to August (autumn and winter), and L. zealandica in October (spring). Our winter in this country is, of course, not nearly as severe as that of England or Northern America. But, so far, I have not met with any apterous males in our summer season. Genus Poliaspis, Maskell. Scale-Ins. of N.Z., p. 56; N.Z. Trans., vol. xiv., p. 293. I venture to put in a few considerations in favour of the retention of Poliaspis as a separate genus. Professor Comstock, in his Second Report of the Cornell University Department of