1916.] NATURAL SCIENCES OF PHILADELPHIA. 543 



It is probable that, like the Last-named species, ii reappears in 

 August as described under R. tenuipes, such species presumably 



1 >eing double-brooded. 



Rhaphidolabis (Rhaphidolabis) cayuga Bp. d. 



Head brownish gray; thorax grayish brown with three dark brown 

 stripes; abdomen dark brown, the segments narrowly ringed with 

 paler; wings pale- brown; cell R 2 sessile, Rs very short, arcuated or 

 angulated; cell 1st M 2 open by the atrophy of the median cross-vein; 

 cell Mi short. 



Male. — Length, 5-5.4 mm.; wing, 6.3-6.6 mm. 



I' < male. — Length, 6.6 mm.; wing, 7.7 mm. 



Rostrum and palpi dark brown. Antennae dark brown, the 

 flagellar segments short-cylindrical. Head brownish gray. 



Mesonotum grayish brown, the praescutum with three dark brown 

 stripes, the middle stripe broadest, ending before the suture; lateral 

 stripes narrow and less distinct; scutum light brown, the lobes largely 

 dark brown; scutellum and postnotum dark with a heavy gray 

 bloom. Pleura dark brown with a gray bloom. Halteres light 

 yellow, the knobs dark brown. Legs with the coxae and trochanters 

 dark brown; femora similar, a little paler at the extreme base; tibiae 

 and tarsi dark brown. Wings with a light brown tinge, stigma a 

 little darker but poorly defined, veins dark brown. Venation 

 (Plate XXVIII, fig. 57) : Sc long, Sc 2 far removed from its tip ; distance 

 between Sc 2 and the origin of Rs about twice the length of the sector; 

 Rs very short, arcuated, angulated, or sometimes spurred; cell Mi 

 short and w r eak, tending to be evanescent, less than one-half the 

 length of cell M s . 



Abdominal segments dark browm, the caudal margins of the 

 terminal segments narrowly ringed with paler; hypopygium brownish 

 yellow. 



Habitat. — Northeastern United States. 



Holotype, d", McLean, Tompkins County, New York, May 7. 

 1916 (Alexander). 



Allotype, 9 , with the type. 



Paratopotypes, 15 cf 9 ; paratype, 1 cf, near Johnstown, Fulton 

 County, New York, August 19, 1916 (Alexander). 



Type in the collection of the author. 



This is the species figured by Needham under the name tenuipes, 17 

 the real tenuipes being shown in the same work, Plate 19, fig. 2. 



"Twenty-third Report of the New York State Entomologist, PL 13, fig. 1 

 (1907). 



