122 PROCEEDINGS OF THE CALIFORNIA 



Six caterpillars taken, all feeding close together, upon a dwarf willow, their 

 brilliant colors giving to the plant at a little distance the appearance of a raceme 

 of showy flowers. In a few days they began to undergo their change, and 

 by the 27th of August had all transformed. The cocoon is formed of very 

 close, fine, glossy silk, the leaves of the plant being drawn around it so as to 

 conceal it entirely. It is almost egg-shaped, and very symmetrical. 



Chrysalis. Short, broad, bright, chestnut brown, very glossy and shining, 

 the abdominal portion showing the few hairs of the larval tubercles. 



Length, 0.65 inch. 



The perfect insects began to appear on the 22d of December, a second fol- 

 lowed on the 9th of January, and the third on the 16th of March. The 

 remaining specimens all died in the chrysalis state. 



Imago. Head and thorax, clothed with dense iron gray hairs, the latter 

 towards the base changing into rich chestnut brown, mottled with fawn- 

 color. Abdomen, stone drab, paler at the base, with the anal tuft fawn-color. 

 Antenna?, with the shaft stone drab, the pectinations yellowish brown. 



Primaries. Pale fawn-color, densely clothed with white scales, scattered 

 somewhat irregularly, thickest towards the costal edge, and there forming an 

 imperfect streak. Inner margins, darker, and with rich brown blotches, con- 

 tinued faintly to the posterior angle. At the base of the wings is also a con- 

 spicuous, somewhat saggitate patch of the same rich brown color. Fringes, 

 white, mottled with brown. Secondaries, whitish drub, with brown markings 

 near the anterior margin, and a brown blotch near the anal angle. 



Underside. Dull whitish drab, shading into brown on the costal edge of 

 both wings. Fringes of primaries, mottled with brown; of secondaries, pure 

 white. 



Expanse of wings, 1.55 inch. 



This species differs considerably from its congener (Het. oonspecta, Hy. 

 Edw., Proc. Cal. Ac. Sci., Sept., 1874) in its more irregular markings, in the 

 absence of any defined bands or spots, and in the darker base of the prima- 

 ries. Both species appear to be rare, and are as yet known only by the speci- 

 mens in my collection. 



Dr. James Blake read the following paper on 

 Remedy for the Phylloxera. 



My attention having been directed some months ago to this new pest which 

 so seriously threatens the destruction of our vineyards, a series of experiments 

 was undertaken under my direction at one of our largest vineyards in Sonoma 

 County, with the view of discovering some means of checking the progress of 

 the disease, as it has already almost destroyed some of the most promising 

 vineyards in that locality. At the time of commencing my investigations I 

 was aware that the subject had occupied the attention of some of the most 

 distinguished scientists in France for the last three or four years, nor should 



