W. (i. DIETZ 233 A LIST OF THE CRANE-FLIES TAKEN IN THE VICINITY OF HAZLETON, PENNSYLVANIA (DIPTERA) BY \V. G. DIETZ, M. D. Hazleton, Pa. The material forming the basis of this paper was collected by the writer during the past twelve years and is contained in the latter's collections. Hazleton, Luzerne County, Pennsylvania, is located on one of the highest plateaus in the State. The highest points within its limits are about eighteen hundred feel above sea-level. It is situated in the middle anthracite coal held and immediately over the Hazleton coal basin, and extends beyond the North outcrop. Underlying the coal measures are strata of " Pottsville Conglomerate" and "Mauch-Chunk Red Shale." Overlying them, are beds of slate and sandstone. The general topography of the region is hilly or mountainous, traversed by creeks, brooks and rills. The vegetation, erstwhile, consisted essentially of hard-woods, with a lesser percentage of soft-woods and conifers. Practically all the large trees have been cut down for use in the coal industry, and, to-day, scrub oak furnishes the principal growths of our hills. As to the climatic conditions, it may be stated, t hat t he winters are rather severe, with considerable snowfall; the summers are rarely oppressively hot, though here, as elsewhere, seasons van-As to the life zones, the fauna belongs to the Canadian and Transition Zones, with a predominance of northern forms. Probably ninety percent of the material here used has been collected in the north western quadrant of the region and with-in one mile and a half from the city limits. The principal collecting places examined are: 1. A swampy part of what is known as Hazle Park, north west of and adjacent to the borough of West Hazleton, t he latter adjoining Hazleton proper. This is open, swampy "round, con-sisting chiefly of decayed vegetable matter. Here the vegetation TRANS. AM. ENT. SOC, XLVII.