226 BULLETIN 31, UNITED STATES NATIONAL MUSEOI. 



Xylotce. It is us broad as the tborax, the second and third segments 

 nearly parallel on the sides. 



L suspect that the female abdomen may be broader, and the face 

 without a tubercle; if so there is evidently a relationship with Myiolepta- 



Xylota marginalis, u. sp. 



' Xijlota Liho Walker, List, etc., iii, 556. 



Rahitat. — White Mountains ! 



2 . Lenj>th, 10™". Front broad, only gently narrowed above, shining 

 black, pollinose on each side, broadly nearly the middle; pile white, 

 somewhat dusky near the vertex. Antenna? yellowish red, the arista 

 wholly yellow; the first joint black, third joint rounded, a little longer 

 than broad. Face shining black, lightly whitish dusted on each side be- 

 low the antenna^. Dorsum of thorax shining bronze black, with very 

 short, obscure whitish pile ; in the middle with two slender darker stripes 

 separated by a linear space. Fleurie shining black; tegulai white; 

 halteres very light yellow. Abdomen bright red; first segment, except 

 the hind angles, a slender triangle at the base of the second, extending 

 to beyond the middle, and the narrow lateral margins of the second, 

 third, fourth, and fifth segments, deej) shining black; the short pile 

 wholly white. All the femora except their immediate tip, and the 

 broad distal end of the hind tibiai, black ; front and middle tibiae yellow, 

 with the distal ends brown, and a less distinct brownish ring before the 

 middle; hind tibite, except the distal part, red, with a brown ring on 

 basal third; first three joints of all the tarsi light yellow, the terminal 

 joints blackish ; hind femora much thickened*, hind cox£e without spurs, 

 hind tibiie with a terminal spur. Wings nearly hyaline, distinctly 

 tinged with yellowish along the veins, stigma opaque yellow ; the base 

 of the marginal cell, the anterior cross-vein, and the cross- veins at base 

 of discal and fourth posterior cells, conspicuously clouded with brown. 



One specimen, near Mount Washington, August 1. This agrees toler- 

 ably well with Walker's description of X. liho, except that the antennae 

 are not "black with the first joint ferruginous" and his description of 

 the abdomen will not apply, viz, "dark red, slightly pitchy on the sides 

 and hind borders of the segments." 



Xylota analis, n. sp. 



Habitat. — California, New Mexico ! 



^,9. Length, 11 to 12«"'. Front of female considerably narrowed 

 above, shining black, toward the vertex metallic, across the middle 

 broadly yellowish gray pollinose and similarly pilose. Antennae black, 

 the third joint brown, with more or less reddish, rounded, not longer 

 than broad, arista wholly luteous. Face black, moderately thickly 

 white pollinose below the antennae; frontal triangle thickly white polli- 

 nose except a lunate s])ot above the antennae. Dorsum of thorax 

 bronze black, more metallic in front, a sericeous spot to the inner side 

 of each humerus; pile very short, in front yellow, across the middle 



