542 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Coloration reddish brown, the prsescutum with three indistinct 

 stripes; abdomen yellowish brown, the hypopygium bright 

 yellow; wings nearly hyaline, the radial sector somewhat 



elongated, arcuated. (Northeastern United States.) 



rubescens sp. n. 



The following general statements may be made regarding these 

 species : 



Rhaphidolabis (Rhaphidolabina) flaveola Osten Sacken. (Plate XXVIII, fig. 54.) 



Canadian life-zone of the northeastern United States and eastern 

 Canada, Osten Sacken's Maryland type being the most southern 

 record. It is abundant from Ontario and Maine south to Maryland. 

 In New York and New England it flies from May 30 to September 21, 

 being most numerous in June. It may be looked for in cold, damp, 

 shady places, such as along mountain streams and similar situations. 



Rhaphidolabis (Plectromyiaj modesta Osten Sacken. (Plate XXVIII, fig. 55.) 



Canadian life-zone of the northeastern United States, known only 

 from the White Mountains, New Hampshire, the type-locality, 

 and the southern Adirondack Mountains, New York. It is found 

 along small mountain streams, flying in June. 

 Rhaphidolabis (Rhaphidolabis) neomexicana Alexander. 



Rocky Mountain region, known from two stations in Colorado 

 and one in New Mexico. 



Rhaphidolabis (Rhaphidolabis) polymeroides Alexander. 



Known only from the type-locality, Eureka, Humboldt County, 

 California, May 22, 1903 (H. S. Barber). 



Rhaphidolabis (Rhaphidolabis) tenuipes Osten Sacken. (Plate XXVIII, fig. 56.) 



Canadian and Canadian-Transitional life-zones of the eastern 

 United States, from Maine to Georgia, flying in April and May in 

 the south, a little later in the north, and reappearing in late summer. 

 Rhaphidolabis (Rhaphidolabis) cayuga sp. n. (Plate XXVIII, fig. 57.) 



Canadian-Transitional zones of the northeastern United States. 

 This is the earliest species of the genus in the north, appearing on 

 the wing in April and early May, reappearing in August. In New 

 York it comes with the very first of the early spring crane-flies, such 

 as Ormosia nubila, 0. innocens, Limnophila brevifurca, Tipula collaris, 

 T. dejecta, etc. 

 Rhaphidolabis (Rhaphidolabis) rubescens sp. n. (Plate XXVIII, fig. 58.) 



Canadian life-zone of the northeastern United States, appearing 

 on the wing a little later than does the last (the first half of June). 

 It is characteristic of cold Canadian woods near running water. 



