270 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 45. 



sharply tapering from the first transverse radius, about two and one- 

 third times longer than the greatest width; sheath narrow, gradually 

 tapering to the apex ; head brunneus ; mesoscutum with the exception 

 of the two spots laterally, and pronotum except a median spot brun- 

 neus; spot on the pronotum, prescutum, spots on the mesoscutum, 

 scutellum, metathorax, abdomen above and sheath dark piceous; 

 legs ruf o-f erruginous ; wings hyaline, iridescent; venation pallid. 



Sugar Loaf Mountain, Boulder County, Colorado. One female 

 collected May 18, 1907, at an altitude of 8,000 feet, by S. A. Rohwer. 

 Swept from the foliage of ArctoclapJiylus uva-ursi. 



Type.—Csit. No. 15381, U.S.N.M. 



XYELA DISSIMILIS, new species. 



Female. — Length to the apex of the abdomen 2.5 mm.; of the 

 ovipositor 1.5 mm. Clypeus with a sharp median carina, anterior 

 margin broadly rounded; supraclypeal area convex; middle fovea 

 obsolete; antennal furrows complete to behind the anterior ocellus; 

 postocellar area undefined laterally by furrows; postocellar furrow 

 obsolete; postocellar line subequal with the ocelloccipital line; fourth 

 antennal joint slightly shorter than the fifth; scutellum without a 

 longitudinal impressed line; stigma about two and one-third times 

 longer than its greatest width; sheath gently tapering to the apex. 

 Black; antennae piceous; clypeus, labrum, mandibles, palpi, head 

 except antennal furrows, the ocellar and postocellar areas, elongate 

 spots on the vertex, spot behind the middle of the eyes to the spot 

 occupying the area of the middle fovea, spots on the pronotum, 

 scutellum, prescutum, and middle of the scutum yellow; legs yellowish; 

 wings hyaline, iridescent; venation pallid. 



Banff, Alberta, Canada. Described from 1 female collected by 

 N. B. Sanson. 



Type.— Csit. No. 15382, U.S.N.M. 



XYELA SLOSSON^, new species. 



Female. — Length to the apex of the abdomen, 2.75 mm.; length 

 'of the ovipositor, 1.75 mm. Clypeus with a rather sharply defined 

 carina, anterior margin produced into a low rounded tooth in the 

 middle; middle fovea obsolete; antennal furrows complete to behind 

 the anterior ocellus ; postocellar line slightly shorter than the ocelloc- 

 cipital line; postocellar area faintly defined laterally by furrows; 

 postocellar furrow obsolete; head and thorax shining, finely granular; 

 fourth antennal joint subequal in length with the fifth; scutellum 

 not impressed; stigma rounded below, hardly twice as long as its 

 greatest width; sheath stout, concave below, convex above, the apex 

 above sharply convex, Ferruginous; antennae, metathorax, abdo- 

 men above to the sheath piceous ; antennal furrows, spot occupying the 

 area which is usually occupied by the middle fovea, postocellar area 



