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Thetis Clearwing
Decidedly smaller than either of the two precedings species. The thorax is olive-green, passing on either side into pale yellow. This color is continued dorsally on the abdomen as far as the terminal segment, but is more or less lost in the broad yellow preanal band. The basal and middle segments of the abdomen are marked laterally with black, and the anal tuft is correspondingly marked with black on either side. The marginal band of the fore wings is norrow, as in H. diffinis, and is always distinctly marked above and below at the apex by a rust-red triangular spot. The wings at their insertion are more or less shaded with pale rusty red both above and below.
This species ranges from Colorado and Wyoming westward and northward to Oregon and British Columbia. It has been by Dr. Dyar made synonymous with the following species, from which it is, however, quite distinct.