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 prsescutum with three dark brown stripes; 

 wings with the cross-vein r at the tip of Ri\ cell Ri 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 

 coxae 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 with a pale gray suffusion, highly 

 iridescent; stigma light brown; veins brown. Venation (fig. 12) 

 Rs short, strongly arcuated; cross-vein r at the very tip of R\; 

 cell Ri 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 fly 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 



