On July 5th, 1884, several larvæ of this species were handed me by a neighbor, who had found them feeding on Asclepias quadrifolia gorwing in the yard. They were just ready to pass the last moult, evidently leaving the plant for the purpose of moulting; some of them being found on a fence attracted the notice of the person finding them. As found they were .55 of an inch long; body brownish balck, each joint with eight tubercles from which project tufts of hairs. Those from the four dorsal, on joints 2 and 3, are long and black, part of those on joint 4 are white; the posterior three joints also supporting long tufts. The dorsal tufts between these are ochre colored, about a third as long as the anterior or posterior, and bend towards the centre from each side. the lower tufts on the anterior part of the body are gray, the rest balck. Head black.

I may give an addition to my note (June, No. 6, p. 120, 1884). During the last seventeen years this beetle has never been rare in Cambridge, Mass., but never so overwhelmingly common as this year. As this elegant beetle was the first I had collected here in October, 1867, it had become my pet, and I paid some attention to it every year. This year it was very common on a long board fence in Ware St., which I have to pass four times every day. The fence surrounds a large garden with many elm trees near. when I heard that the beetle had been very destructive to elm trees in some places on the north side of the College grounds, and that it had nearly denuded some trees in Sommerville, I gave closer attention to it. Till June the leaves of the elms in Ware St. were comparatively uninjured. Then appeared the second brood of larvæ, and very soon the leaves were honeycombed with more or less round holes, and turned yellow prematurely. The larvæ were first described by Harris, Injur. Ins., 1841, and the same repeated in all following editions; the edition of 1862 gives a figure of the larva and beetles.

Chrysomela labyrinthica, Lec. This insect is, I believe, by some entomologists thought to be a variety of C. scalaris, Lec. I incline myself to the belief that it is a distinct species, but my knowledge of it is too limited for me to form a decided opinion. Both forms occur here; scalaris is common wherever basswood or elm are found; labyrinthica is scarce, and as far as my experience goes, is confined to one locality, viz., that portion of the Mountain Park lying between the head of Redpath Street and the road through the Park. I have only found labyrinthica during the early part of summer; scalaris occurs both in spring and fall. Mr. Moffat, who records labyrinthica from Hamilton (Can. Ent., vol. xiv., page 57), took a specimen on May 23rd, and found its season to last about four weeks, during which he took over a dozen. It appears to be very rare, and is in very few lists. Mr. Pettit does not give it in his Grimsby List. Mr. D'Urban records scalaris common at Montreal, but does not mention labyrinthica. The same author, in his list from the Valley of the River Rouge, gives scalaris as “abundant on alders throughout the district, from the end of June to the end of September,” but says nothing of labyrinthica. Mr. Ritchie gives both scalaris and labyrinthica in his Montreal List, but without dates.

The proportion of the sexes in insects often throws much light upon the habits and appearance of the species. Having had good opportunity to make observations of this kind ttpon Cicindela vulgaris Say, in collecting a large number of the beetles, I have made out the appended table, which will explain itself. The dates I give, as they will show how the sexual proportion varies at different times of the season. From my observations it would seem that when the insects first appear in spring the females are much the more numerous; but that when they first appear in fall the males outnumber the females as two to one. I have taken this species here from 3rd March (1882) to 25th October (1884).

In Can. Ent., vii., p. 236-240, I gave an account of experiments with P. Ajax, placing the chrysalids on ice. In vol. ix., 4 and 203, of Ajax, P. Tharos and L. Pseudargiolus. In Psyche, iii., 6 and 15, these were all brought together, and additional observations on G. Interrogationis were given; also p. 174, on L. Disippus. In the case of the seasonally-dimorphic Ajax, the conclusion was reached, Psyche, iii., 18, that the longer the exposure the more decided the change, but changes had been produced at 11 to 30 days; at and under 8 days no change was perceptible. That 30° to 40° Far. seemed to be the proper temperature for the purpose. That the effect of the cold was to albinize the butterfly, the black area being constantly reduced.

Acrobasis vaccinii, n. s.—General color and appearance of A. indiginella Zell. (nebulo Walsh) but a somewhat smaller species, with primaries usually narrower. It may be distinguished by the following differences as compared with indiginella:

Average expanse, 15 mm. Colors of a colder gray with less reddishbrown or tawny on the inner portions of primaries, and with the pale costal parts nearly pure white, so as to contrast more fully with the dark shades, and to more fully relieve the basal branch of the forked shade on inner part of first or basal line, this basal branch being also usually darker than the outer or posterior branch. The triangular costal patch from the basal line is obsolete. The transverse pale lines are less clearly defined and the terminal is nearer the posterior border of the wing, i. e., the median field is wider. The geminate discal dots are always well separated and the inner one well relieved by the white which extends around it on the darker ground and often forms an annulus. The oblique shade from apex is less clearly defined.

On 19th October, 1884, I took from a decaying hickory stump a specimen of Alaus oculatus (Linn.), which had its left elytron .75 mm. shorter than its right. This seemed to me a curious and very noticeable deformity, and one I had never before observed. But on 13th December ensuing I discovered that a fine, robust specimen which I had taken from decaying hickory the day previous had its left elytron .25 mm. shorter than its right, this time the difference being much less, but still noticeable. I then examined fifteen other specimens of this species in my collection, with the following result: One with left elytron .25 mm. shorter than right; one with left .20 mm. shorter than right; one with left shorter than right, but the difference hardly appreciable; one (small specimen) with right .20 mm. shorter than left; and one in which the right was so slightly less than the left that the difference could scarcely be seen. The remaining ten showed no appreciable differences in this respect.