Asiphum sacculi n. sp.

I first saw the gall of this louse about eighteen years ago when on a mountain trip some twenty miles or more northwest of Fort Collins. I did not meet with it again until the present summer, when, on July 13th, I found two of the leaf pockets characteristic of this species in Estes Park on twigs of Populus tremuloides about six miles apart and at an altitude of about 7500 feet. On August 9th, four more of the galls were taken near the Half-way House on Pike's Peak, at an altitude of about 9000 feet. In two of these galls there were no living lice. In each of the occupied galls taken (four), there was one large stem-female present, with a large number of her offspring in all stages of development up to the adult alate lice. There were no adult apterous lice and all that were half grown or more gave evidence that they were to get wings. In the breeding cages the alate lice began at once to deposit young with long beaks. In every case the lice were accompanied by a species of large black ant.

The Gall. An infested leaf becomes very much enlarged, and somewhat thickened with the edges turned in so as to make a heart shaped pocket, and the apex of the leaf is extended and turned back as shown in Plate XV, Figure 10. The color of the infested leaf is yellowish green, and lighter than the healthy foliage surrounding it.

- CP Gillette: (1914) Some Pemphiginae Attacking Species of Populus in Colorado^©

Reference: https://www.biodiversitylibrary.org/page/11256375#page/77/mode/1up