H. Zweifel May 30, 1952 104 Serhometus coeruleus Butte Meadows, Butte Co., Calif. Adult Lygaeids collected here are remarkable for their green dorsal body surfaces. A very small juvenile has the normal bronze dorsal fond and a medium sized individual shows some yellowish-green in the region of the lateral fold but the adults have what seems at least like two large specimens a light green dorsal ground color. In the adults, the posterior portion of the head and the cape are gray, contrasting with the green body. The snout is green. One of these Lygaeids was found under a piece of wood by a small stream. When jarred, the living jumped onto the stream and swam half way across (the stream was about 4 feet wide and 4" deep) whereupon it dove to the bottom and hid under a rock with only the head and tail protruding. It stayed under water for 3 minutes before sticking its nose above the surface. Yellow pine, white fir, Douglas-fir and incense cedar are the dominant trees here.