VOL. XVIII, PP. 161-162 JUNE 29, 1905 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON DESCRIPTION OF A NEW GENUS AND SPECIES OF TPvOCHILIDAE. BY HARRY C. OBERHOLSER. A single specimen of a hummingbird in the collection of the Field Columbian Museum of Chicago seems to represent a new genus as well as a new species. It is here described through the courtesy of Mr. Charles B. Cory, the Curator of Birds in this museum. Aeronympha* gen. nov. Chars, gen. Wings of moderate length, reaching when closed to within about 12 millimeters of the end of the tail ; none of the primaries narrowed, but much as in Vest! pedes and Cynnolrsbia ; tail about two-thirds the length of wing, and forked for one-fourth its own length, the rectrices obtusely and rather abruptly pointed, about 7 mm. in width, very gradually becom ing slightly less than this basal ly ; upper fourth of tarsus feathered, and together with the lower tibia, enveloped in a small tuft of light-colored feathers, reaching on the former about half-way to the toes ; bill not long, but exceeding the head, straight, subcylindrical, moderately slender, slightly dilated laterally near the base, and rather abruptly pointed at the tip, neither maxilla nor mandible with any trace of subterminal serrations; nostrils covered by the frontal feathers which extend out on maxilla for nearly one-third the length of bill measured from the rictus, and consider ably beyond the feathering between the rami of the mandible. Type. Aeronympha prosantis sp. nov. * o-^p, air ; VII/M^IJ, nymph. 27-Puoc. BIOL. Sue. WASH., VOL. XVIII, 1905. (1C1)
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