1. Contrary to my expectation, the Asiatic forms of the Comma group are not so near the American as are the European. Dr. Speyer tells us that the former vary from typical Comma in a different direction from the latter. If the American are derived from the European, or the reverse, the Asiatic ought to lie between the two, apparently.

2. I am satisfied that Juba should rank as a species. Dr. Speyer gives sufficient reasons for this, and examination of many examples confirm this view. I have a beautiful variety of Juba (male) sent me by Prof. Snow, and taken by him at Los Vegas, N. M., iu 1882. The upper side is darker—more fuscous and less fulvous—than any other example I have seen, and secondaries beneath and the apical area of primaries are densely dusted with golden-green; the spots white and somewhat smaller than in the type. I call this vat. Viridis.

The family Thripidæ, though possessing many characters of peculiar interest, and being of no little importance economically, has received but very little attention from American Entomologists, either systematic or economic. With the exception of a few notes upon their habits, and descriptions of some four or five species by Dr. Fitch, and also a few notes by Mr. Walsh and Prof. Riley, concerning their food habits, scarcely anything has been written of our native species.

Without going into a discussion of the classification of the group, or the peculiar characters which seem to ally it to different orders, it will be sufficient here to state that the wings are entirely membranous and folded flat upon the back, which, with the general conformation of the body, would seem to place it with the Homopterous division of the Hemiptera. The mouth parts, however, are free, composed of both mandibles and maxillæ, and the maxillæ and labium are palpigerous—characters very diverse from those of the group just mentioned.

In reply to the questions raised by the Rev. Thomas W. Fyles on p. 84 of the May number, permit me to say:

1. That to speak of “the parasite of Phylloxera vastatrix and the gall insect of the nettle tree,” as he does in the heading to his communication, is inaccurate, since there are many of each.

2. Besides a number of Cecidomyid galls on Celtis, I am acquainted with more than a dozen Psyllid galls upon the plant. The insects producing these galls mostly belong to a new genus which, in a paper that I have prepared on the Psyllidæ of the U.S., is called Pachypsylla.