Its generic name is very suggestive. It is Empidonax, from two Greek words, meaning mosquito and a prince—Mosquito Prince! Major Bendire says: “In the Adirondack mountains, where I have met with it, it was observed only in primitive mixed and rather open woods, where the ground was thickly strewn with decaying, moss-covered logs and boles, and almost constantly shaded from the rays of the sun. The most gloomy looking places, fairly reeking with moisture, where nearly every inch of ground is covered with a luxuriant carpet of spagnum moss, into which one sinks several inches at every step, regions swarming with mosquitoes and black flies, are the localities that seem to constitute their favorite summer haunts.” Surely the name Empidonax is most appropriate. [Illustration: YELLOW-BELLIED FLYCATCHER. (Empidonax flaviventris). About Life-size. FROM COL. CHI. ACAD. SCIENCES.] The nest is usually constructed on upturned roots near the ground, or on the ground deeply imbedded in the long mosses. A nest belonging to the National Museum is thus described: “The primary foundation of the nest was a layer of brown rootlets; upon this rested the bulk of the structure, consisting of moss matted together with fine broken weed stalks and other fragmentary material. The inner nest could be removed entire from the outer wall, and was composed of a loosely woven but, from its thickness, somewhat dense fabric of fine materials, consisting mainly of the bleached stems of some slender sedge and the black and shining rootlets of ferns, closely resembling horsehair. Between the two sections of the structure and appearing only when they were separated, was a scant layer of the glossy orange pedicels of a moss not a fragment of which was elsewhere visible. The walls of the internal nest were about one-half an inch in thickness and had doubtless been accomplished with a view of protection from dampness.” The nests are sometimes made of dried grasses interwoven with various mosses and lined with moss and fine black wire-like roots. Again, the birds seem to have an eye for color and will face the outside of the nest with fresh and bright green moss. In every way the nest seems a large house for so small a bird. To study this Flycatcher “one must seek the northern evergreen forests, where, far from human habitations, its mournful notes blend with the murmur of some icy brook tumbling over mossy stones or gushing beneath the still mossier decayed logs that threaten to bar the way. Where all is green and dark and cool, in some glen overarched by crowding spruces and firs, birches and maples, there it is we find him and in the beds of damp moss he skillfully conceals his nest.” THE REIGN OF THE WHIPPOORWILLS.