During the summer of 1879, while working with Professor Comstock upon the natural enemies of the cotton worm, I came across the following passage in his fleld notes of the previous year :—

“August 27.–I found yesterday a cotton worm about five-eighths of an inch in length, which, though yet alive, was being destroyed by three green larvæ which were upon it. I found the specimens abont 10 a. m. Last evening I observed that the cotton worm was nearly eaten. The parasites had very short bodies, which, when they moved, were pointed at one end. I had intended to describe the specimens, but I find that they have spun cocoons about their bodies.