210 THE CANADIAN ENTOMOLOGIST 
Genus Rhaphidolahis O. S. 
Rhaphidolabis (Rhaphidolabis) sessilis, sp. n. 
Size large (wing of the female over 8.5 mm.) ; body-coloration 
gray, the mesonotal praescutum with three dark brown stripes; 
wings with the cross-vein r at the tip of Rv, cell R^ sessile or sub- 
sessile. 
Female. — Length 6.8 mm.; wing 8.8 mm. 
Rostrum and palpi dark brown. Antennae brownish, the 
scape with a gray bloom; flagellar segments oval, dark brown. 
Head gray. 
Mesonotum light gray, the praescutum with three dark brown 
stripes of which the median one is slightly darker and broader, 
becoming obsolete just before the transverse suture; lobes of the 
scutum brownish. Pleura gray, the dorsol-pleural membranes 
more brownish. Halteres pale, the knobs brown. Legs with the 
coxffi dull yellow, the outer faces with a gray bloom that is heaviest 
on the hind coxae; remainder of the legs dark brown, the femora 
brightened basally. Wings wath a pale gray sufifusion, highly 
iridescent; stigma light brown; veins brown. Venation (fig. 12) 
Rs short, strongly arcuated; cross-vein r at the very tip of Rv, 
cell Rz sessile or very short-petiolate. 
Abdomen dark brown; valves of the ovipositor strongly 
reddish yellow. 
Holotype, 9, Hall Valley, Colorado, August 11, 1915, (E. J. 
Oslar). 
This ffy is readily separated from all the described species 
(see the author's key to the Nearctic species of the genus. Pro- 
ceedings Academy Natural Sciences Philadelphia, p. 541, 542, 
1916), in its large size and the position of the radial cross- vein. 
Rhaphidolabis (Rhaphidolabis) major, sp. n. 
Size large (wing of the female over 9 mm.); body-coloration 
pale brown, the praescutum with a broad, dark brown median 
stripe. 
Female. — Length 7.8 mm.; wing 9.4 mm. 
Rostrum yellowish brown, the palpi dark brown. Antennae 
dark brown. Head brownish gray. 
Pronotum light brown, darker brownish medially. Mesonotal 
