The Purcell Range forms the easternmost portion of the Selkirk Mountains. It runs nearly north and south and is well marked off from other mountain ranges by the Rocky Mountain Trench on the east and the Purcell Trench on the west. The latter is occupied in part by Kootenay Lake. Even the broad geography of this range is imperfectly known as yet and its entomological resources are practically unknown.

Very little work has been done on the life history or habits of Mallophaga. Only two papers have heen published since 1913 which give even a general discussion of the life history of these parasites. The number of instars through which the insects pass was not determined in either case. For the experiments reported in this paper, the pigeon louse (Columbicola columbae [Linnaeus]) was chosen because of the ease of obtaining and handling the common host, Columba livia Linn.

Externally resembling the species of Erythroneura with red dorsal stripe (E. lawsoniana Bk.) more than any member of its own genus. Easily separated from these of course by the submarginal vein and from all Dikraneura by the bright red or orange median dorsal stripe.

The development of wings from imaginal discs has been carefully worked out in many forms of insect larvae. Marshall's important paper on te development of the wings of a caddis-fly, Hesperophylax (Platyphylax) designatus Walk. (Zeitschrift fur wissenschaftlicheZoologie, Bd. CV, Heft 4, 1913) is almost the only literature dealing with this phenomenon in the Trichoptera.

The genus Cymbolus Gorham is peculiar to the American tropics. Of the five previously described species, two are from Mexico, two are from Guatemala, and the fifth is from Brazil. I take great pleasure in naming the following species in honor of Mr. A. B. Wolcott through whose efforts I first became interested in the study of this genus.

Male. Length 13.9 mm. Body olivaceous green as in the subspecies harrisii Leng, elytra immaculate.

Female. Length 14 mm. Color as in the male but with the middle band of each elytron represented by a very small, circular, submarginal spot; the apical lunule represented by a smaller spot.