544 PROCEEDINGS OF THE ACADEMY OF [Oct., 



The types occurred rather abundantly along a small woodland 

 stream and were found commonly resting on the trunks of sugar 

 maples, swarming out into the air at short intervals. The species 

 occurred with the following crane-fly associates : 



Ormosia innocens, 0. nubila, 0. rubella, Erioptera septemtrionis, 

 Limnophila brevifurca, Adelphomyia ?ninuta, Ula elegans, Pedicia 

 conterminata and Tipula dejecta. 



Rhaphidolabis (Rhaphidolabis) rubescens sp. n. 



Head light silvery gray; mesonotum reddish, sparsely gray pruinose, 

 with three indistinct brown stripes; abdomen yellowish brown, the 

 hypopygium bright yellow; wings nearly hyaline; -cell R 2 sessile; 

 Rs arcuated, rather elongate; cell 1st M 2 open by the atrophy of m; 

 cell Mi moderate. 



Male. — Length, 5.3-5.5 mm.; wing, 6.3-6.6 mm. 



Female. — Length 5.5-5.6 mm.; wing, 6.5-7 mm. 



Rostrum and palpi dark brown. Antennae with the basal segments 

 brown, sparsely grayish pruinose; praescutum with three indistinct 

 brown stripes, lateral stripes less evident, median stripe narrowed 

 behind and becoming indistinct at the suture; scutum with the lobes 

 brownish gray, the median area dull reddish yellow; scutellum pale 

 brownish yellow, gray pruinose; postnotum light reddish with a gray 

 bloom. Pleura light reddish with a sparse gray bloom. Halteres 

 pale, the knobs brown. Legs with the coxae and trochanters light 

 brownish yellow; femora and tibiae brownish yellow, the latter a 

 little darkened towards their tips; tarsi brown. Wings nearly 

 hyaline, stigma very pale to indistinct, veins dark brown. Venation 

 (Plate XXVIII, fig. 58): Sc long, ending at nearly midlength of R 2 ; 

 distance between Sc 2 and the origin of the sector about twice the 

 length of the latter; Rs rather long, strongly arcuated, but not 

 angulated; cell R 2 sessile, sometimes broadly sessile; cross-vein r at 

 the tip of Ri] cell 1st M 2 open by the atrophy of m; cell M x present, 

 about one-half as deep as cell M%. 



Abdomen pale yellowish brown, the lateral margins more yellowish, 

 the hypopygium bright yellow. 



Habitat. — Northeastern United States. 



Holotype, d* , Simmons woods, Gloversville, Fulton County, New 

 York, altitude 900 feet, June 22, 1916 (Alexander). 



Allotype, 9 , topotypic, June 12, 1916. 



Paratopotypes, 20 & 9 , June 9, 1914; June 12 to 22, 1916. 



Type in the collection of the author. 



The ecological conditions under which this species lives have been 



