THE CANADIAN ENTOMOLOGIST 435 -ponding joint is but slightly broader than the preceding ones and not as long as joints 3 and 4. 4. I n sinuata the basal portion of the vitta is nearly parallel to the suture, and the middle portion very little or not a t all narrower than the distal, while in vittata the basal portion bends towards the suture and the middle portion is decidedly narrower than the distal. 5 . I n sinuata the prothorax is twice as wide as it is long, while in vittata its width is only about one-third greater than its length.