.T. K. MALLDC II 175 



XENOPHORBIA iivn. n 



TIlis genus is scparal)le from Hylcitiyid hy Iho following coin- 

 liination of characters: Third antennal joint l)ar('ly longer than 

 second, nnich broader at apex Ihan a( base; face elevated in 

 center between bases of antennae, tlu; latter distinctly sepai'ated, 

 the elevation forming a broad fiat I'idge, which gradually decreas(^s 

 in height, to midway to mouth-margin; vibrissal angle very much 

 produced, the distance from its anterior mai-gin to lower maigin 

 of eye al)out twice as great as width of parafacial at base of an- 

 tenna; palpi club-shaped; thorax with four pairs of post-sutural 

 dorso-central bristles; posthumeral l)ristle normally duplicated. 



Genotj/pe. — Stotuoxys muscaria Fabricius. 



Xenophorbia muscaria (Fabricius) 



This species, which has generally been referred to Phdrhifi, is 

 conmion in the Northwest. I have found it very commonly on 

 flowers of willows and dandelion on the hills in Scotland. 



Pegomyia luteola sp. n. 



Male. — Yellowish testaceous, slightly shining. Frontal triangle; red, orbits 

 silvery, third antennal joint almost entirely brown, palpi yellow; occipital 

 hairs t)lack. Alxlomen with whitish pruincscenee on dorsum, when viewed 

 from behind a rudimentary dorso-central vitta is visible; posterior margins 

 of tergites narrowly fuscous; lateral processes of fifth sternitc black, covered 

 with black hairs. Legs yellow, apices of hind femora sliglitly browned: 

 tarsi black. Wings (dear. Calyi)trae and haltercs yellow. 



Eyes separated by about the width of anterior ocellus, the orl>its (con- 

 tiguous for a short distance below ocelli; third antennal joint on its inner 

 side about 1.5 as long as second; arista pubescent, slightly swollen at base; 

 profile as in unicolor Stein, the cheeks less than one-sixth as high as eye; a 

 small hair above vibrissa. Thorax as in unicolor, but the anterior acros- 

 tichals are separated by less space than they are from the dorso-centrals, 

 and there is but one irregular series of setulae between them. Abdomen 

 de{)ressed, the hypopygium large; fifth sternite with its lateral processes 

 densely covered with erect black hairs. Fore tibia with an antero-dorsal 

 and a po.sterior bristle; mid tibia with one antero-dorsal, one postero-dorsal, 

 and two posterior bristles; hind femur with a series of antero-ventral bristles 

 which does not extend to base, and a few shorter bristles on middle of poslero- 

 ventral surface; hind tibia with one antero-ventral, two antero-dorsal and 

 two postero-dorsal bristles. Outer cross-vein almost .straight; costal thorn 

 minute. Length, 5.75 mm. 



Type.—d"; Eastport, Maine, July 14, (C:. W. Jolmson), [B. H 

 N. H.]. 



TR.\Xft. AM. ENT. SOC, XLVI. 



