The larvae were found in these clumps from late in May until the first week in July in the foot hills, and higher up in the mountains they were just beginning to emerge July 20th. When ready to emerge they climb up a stem during the night far enough to free themselves from the froth and as soon as the sun strikes then in the morning they burst their pupal skins and an hour later they are ready to fly up to the pine trees where their color admirably protects them. Although both these plants grow very commonly over a wide extent of territory the _Aphrophora_ larvae have never been found on them except where they were within a short distance of a pine tree. At first sight it would seem probable that the eggs were deposited in the twigs of the pines, and that the young larvae dropped to the ground, and from there sought out a food plant, as is the case in some Cicadas. But as numerous larvae were found in positions practically inaccessible to any such means of distribution—such as on the opposite side of a sharp ledge of rocks, across a bramble thicket, or even on plants growing in the crevices of bare rocks at a considerable distance above any pines—it seemed nearly certain that the adults must fly back to the plants to deposit their eggs. It will be interesting to discover whether a similar food habit occurs in any of the Eastern members of the genus or whether this is peculiar to the western species. It seems possible that original pine-inhabiting species finding themselves unable to maintain their froth masses in their exposed positions on pine branches in such a dry atmosphere were compelled to seek moister conditions such as are afforded by the shade and contact with the earth under these bushy plants. EXPLANATION OF PLATE.—Fig. 1. _Aphrophora permutata_ Uhl. Adult. X About 7. Common from the Rocky Mountains to the Pacific. 1a—Side view of head, showing profile of face. Fig. 2. Pupa of above. 2a—Side view of head of pupa. Fig. 3. Semi-diagrammatic cross-section of a clump of _Chrysopsis villosa_ to show relative location of larvae with relation to the froth mass and the surface of the earth. Fig. 4. _Aphrophora parallela_ Say Adult. X About 7. Eastern U. S. to Ohio and Mich. 4a—profile of head of same. FOOTNOTES: [1] For a detailed account of this process see Prof. Morse’s article “A Bubble-blowing Insect.” Pop. Sc. Monthly, May, 1900. [Illustration: _Plate 10._ BALL ON APHROPHORA LARVAE.] THE VERNATION OF SALIX. ROBERT F. GRIGGS.