The results of my experiments with P. Ajax, as noticed in Nos. 8 and 9 of the Canadian Entomologist (Vol. ii. pp. 115 and 133), are as follows :

From six larvæ obtained from eggs of Ajax:, deposited in capitivity, 16th May, 1870, I obtained two males, four females, Marcellus, between 20th and 24th June.

From twenty-four larvæ from eggs of Ajax deposited 2nd June, I obtained twelve males, ten females, all Marcellus, between 3rd and 9th July, and one chrysalis went over the winter.

From five larvæ from eggs of Marcellus, deposited 7th June, I obtained four female Marcellus between 4th and 9th July, and one chrysalis went over the winter.

In the proceedings of the Boston Society of Natural History, Mr. S. H. Scudder publishes a paper, “On the Synonymy of Thecla Calanus,” under date of March, 1870.

Mr. Scudder says : “In Eastern North America there are two species of Thecla, closely allied, occupying, so far as we know, the same geographical area (from Canada to Virginia or Georgia, and from Massachusetts to Iowa), and, until recently, almost invariably confounded by American entomologists. Messrs. Grote & Robinson first called public attention to the fact of their specific distinctness, although Mr. W. Saunders, both in his correspondence and MSS., had previously urged the same point.

67. Trechus [Bradycellus] Tibialis, Kirby.—Length of body 2 3/4 lines. Only a single specimen taken.

[47] Body black, somewhat glossy. The tip of the palpi and scape of the antennæ are rufous; the prothorax is rather wider than long, but nearly square; the short basilar furrows observable in Argutor distinguish species from the succeeding ones: elytra lightly furrowed, furrows impunctured; in the usual situation adjacent to the second furrow a little beyond the middle of the elytrum a very minute puncti from impression is just discernible ; the lateral margin and suture at the apex of the elytra are reddish: the tibiæ are rufous but the cubit is black, at the tip , the tarsi are darker, the hand has four dilated joints as in the other species of the genus.

On returning from a collecting tour, one day in last June, I emptied my larvæ box, putting in a collar box for a short time a larvæ of C. Silvatica, one of the Geometrid and one other Lepidopterous larva: the two last I could not identify, but they were all, Lepidopterous, I did not open the box until three or four hours afterwards, when I found a decided change in the appearance of my larvæ, The C. Silvatica larva was bitten entirely apart, the head and three first segments being in one piece, the three last abdominal segments in another; the remaining segments were in an indistinguishable mass on the bottom of the box. The geometrid larva was in almost as bad condition, but was not bitten apart; the third was uninjured.