Over a year ago the writer received from Prof.T. D. A. Cockerell, for naming, a pair of Tipulids with aborted wings, taken on the summit of the Las Vegas Mts., in New Mexico, I suspected that they belonged to some normally long-winged form but repeated comparisons have failed to convince me that they belong to any of those represented in National Museum. They closely resemble Limnophila costata, Coq., which also inhabits high altitudes in the same region, but the joints of the antenn♀ are much shorter and broader, besides other differences.