on the 15th of June 1869, I obtained several Thecla larvæ by beating over an umbrella the branches of some small oak trees growing in a cemetery about two miles west of London. Not having met with them before I at once took the follorving description : Length, ·40 in., onisciform. Head small, pale greenish-yellow with a minute black dot on each side. Mandibles pale brown, with a faint whitish patch immediately above them. Body above yellowish-green, streaked above with yellowish-white, and thickly covered with fine, short, white hairs ; second segment of rather a darker shade of green than the rest of the body.