504 PROCEEDINGS OF THE ACADEMY OF [Oct. r 



knobs brown. Legs with the coxae and trochanters dull yellow; 

 femora brown, a little paler basally; tibiae and tarsi brown. Wings 

 subhyaline, stigma indistinct, veins pale brownish yellow. Venation 

 (Plate III, fig. 36) : Sc long, ending beyond the fork of the sector; Sc t 

 about four to six times as long as Sc 2 ; Rs long, gently arcuated; cross- 

 vein r present, connecting with R 2+3 at about one-third its length; 

 R 2 oblique (as in Gonomyia subcinerea) ; cell 1st M 2 closed; basal de- 

 flection of Cui at about one-third to one-fourth the length of the cell. 



Abdomen brownish yellow, the sternites paler yellow. Male 

 hypopygium (Plate XXXI, fig. 98) with the pleurites moderately 

 slender, broader basally, bearing three appendages, the largest 

 appendage (a) very elongate, digitiform, with numerous long scattered 

 hairs on raised tubercles, the apex a little flattened, blunt, this 

 appendage decussate with its fellow of the opposite side; the two 

 smaller appendages are slender, one (b) directed proximad, decussate, 

 pale, the tip drawn out into a long point; the third appendage (c) 

 slender, directed cephalad, slightly enlarged beyond the middle, the 

 tip subacute. Penis-guard rectangular, on the ventral side running 

 out into a sharp, median chitinized point. In a position of rest the 

 large finger-like appendages lie parallel and are more or less approxi- 

 mated, but not decussate, directed strongly ventrad. 



Females have the eyes smaller, the praescutum more yellowish; 

 ovipositor powerful, the valves elongate, upcurved toward the tips. 



Habitat. — Northeastern United States. 



Holotype, cf , Mountain Lake, Fulton County, New York, altitude 

 1,600 feet, June 13, 1916 (Alexander). 



Allotype, 9 , Buell Mountain, Fulton County, New York, altitude 

 1,800 feet, June 18, 1916. 



Paratopotypes, 2 c? 's, 35 9 's. 



Type in the collection of the author. 



The holotype occurred on rich vegetation along a small temporary 

 stream flowing into the lake on June 13. Associated with the 

 species at this time were the following crane-flies: Dicranomyia 

 pubipennis, Ormosia rubella, Erioptera (Empeda) stigmatica, Limno- 

 phila toxoneura, L. areolata, L. nigripleura, L. brevifurca, L. rufibasis, 

 L. sylvia, Ulomorpha pilosella, Rhaphidolabis (Rhaphidolabis) 

 tenuipes, R. (Rhapidolabina) flaveola, R. (Plectromyia) modesta, 

 Tricyphona vernalis, T. calcar, Dolichopeza americana, Oropeza venosa,, 

 Tipula senega, T. iroquois, and T. hermannia. 



The allotype and several of the paratypes occurred along a small 

 temporary torrent pouring down the eastern slopes of Buell Mountain 



