1916.] NATURAL SCIENCES OF PHILADELPHIA. 543 
It is probable that, like the last-named species, it reappears in 
August as described under R. tenuipes, such species presumabl}' 
being double-brooded. 
Rhaphidolabis (Rhaphidolabis) cayuga sp. n. 
Head brownish gray; thorax grayish brown with three dark brown 
stripes; abdomen dark brown, the segments narrowly ringed with 
paler; wings pale brown; cell R2 sessile, Rs very short, arcuated or 
angulated; cell 1st M2 open by the atrophy of the median cross-vein; 
cell Ml short. 
Male. — Length, 5-5.4 mm.; wing, 6.3-6.6 mm. 
Female. — 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 prsescutum with three dark broA\Ti 
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 coxse 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, Sc2 far removed from its tip; distance 
between Sc^ and the origin of Rs about twice the length of the sector; 
Rs very short, arcuated, angulated, or sometimes spurred; cell Mi 
short and weak, tending to be evanescent, less than one-half the 
length of cell M^. 
Abdominal segments dark brown, the caudal margins of the 
terminal segments narrowly ringed with paler; hypopygium browTiish 
yellow. 
Habitat. — Northeastern United States. 
Holotype, cf, McLean, Tompkins County, New York, May 7. 
1916 (Alexander). 
Allotype, 9 , Avith 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,'^'' 
the real tenuipes being shown in the same work, Plate 19, fig. 2, 
" Twenty-third Report of the New York State Entomologist, PI. 13, fig. 1 
(1907). 
