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. Bulletin. Natural history; Natural history -- Montana. 30 BULLETIN UNIVERSITY OF MONTANA. Butterfly—Known as cabbage butterfly; yellowish white, with apex of fore wings black. Two black spots on fore wings and one on the hind wings. Underneath, the apex of the fore wings and the entire surface of the hind wings are pale lemon yellow. In the female two spots on outer part of fore wings, in male only one. The larva feeds principally on cabbage. Its color is green like the cabbage leaf, with a narrow greenish lemon yellow dorsal band. The body is clothed with very flne short hairs. Distribution—This common species is an importation from Europe. It reached Quebec in 1860; how, no one knows, perhaps in cabbage. By 1881 it had spread over the eastern half of the continent, from Hudson Bay to Southern Texas. In 1886 it had reached Denver, and in 1884 had reached the head waters of the Missouri. It now possesses the cabbage fields from the Atlantic to the Pacific, "to the incalculable damage of all who provide the raw material for sauerkraut." The injury done by the caterpillar is estimated to amount to hundreds of thousands of dollars. It is probably to be found all over the state, and has been taken at almost every place where collections have been made, at Missoula, Miles City, Bozeman, Helena, University of Montana Biological Station at Flat- head Lake, Mission Mountains. It does not seem as common as P. protodice. Allen collected it at Dillon. THE MUSTARD WHITE. Pontia nap! Linnnaeus. Fig. 27.. 1 2 Fig. 27. Pontia napi, No. 1, var.pallida No. 2, var. acadica. Butterfly—Expanse of wings, about 1.75 inches. In general shape and appearance it resembles protodice or rapae. General color while, with grayish vein markings, some with a dusky spot on the wings, or dusky at the base of the wings. A Protean, cosmopolitan species, ex- isting in many forms, the result of climatic and local influences, which has a very wide distribution. The different forms are to