96 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



side, projects nearly four-fifths the horizontal diameter of the eye. An- 

 tennae black, not reaching below the middle of the face, the second and 

 third joints of nearly equal length. Arista thickened on at least the 

 basal two-fifths, the penultimate joint as broad as long. Frontal bristles 

 not descending below the base of antennae, outside of these numerous 

 bristly black hairs. Eyes bare, sides of front and the parafacials con- 

 colorous, densely silvery gray pollinose, the sides of face bearing many 

 irregularly disposed bristly black hairs. Vibrissae inserted far above 

 the level of the front edge of the oral margin, proboscis short, the palpi black. 

 Genae a rich velvet reddish brown. Cheeks broad, weir" covered with 

 bristly black hairs. Facial plate deeply concave, hardly wider than the 

 sides of face. 



Thorax densely gray pollinose, marked with three wide black dorsal 

 vittae, either side of the wide median vitta an indistinct narrow vitta 

 which gradually disappears just beyond the transverse suture. Post- 

 sutural macrochaetae four, sternopleura bearing two strong bristles with 

 many long bristly hairs between, several of which approximate the true 

 macrochaetae. Scutellum bearing three pairs of strong marginal and 

 several discal macrochaetae. Legs including the coxae black, the tarsal 

 claws elongate. 



Abdomen elongate conical, gray pollinose, marked with three rows of 

 semi-triangular contiguous black spots. First and second abdominal 

 segments bearing a median marginal pair of macrochaetae, the third a 

 marginal row and the fourth a marginal row and sub-marginal pair. 



Wings hyaline, the third longitudinal vein bearing two or three bristles 

 at its base, calypteres milky white faintly tinted with yellow along the 

 borders. 



Described from a single male specimen taken in the Logan 

 Canon, Utah, by Mr. E. P. Hoff. (The date of collection upon 

 the locality label, pinned beneath the specimen is not plainly 

 descernible, but is apparently July 4, 1909.) 



Holotype: Cat. No. 20055 U. S. N. M. 



Parkeriellus, new genus. 



Genotype: Parkeriellus flavipalpis new species. 



Head wider than the thorax, sides of face on the lower half bare, front. -i 

 bristles in a single row, descending to the base of the third antennal joint, 

 frontal vitta opaque brownish black, not as wide as the sides of front. 

 Ocellar bristles directed forward. Vibrissae cruciate, placed on a level 

 with the front edge of the oral margin. Facial ridges bristly on the lowest 

 fourth to one-third. Parafacials less than one-third as wide as the facial 

 depression. Eyes bearing short scattered hairs, penultimate joint of arista 

 as broad as long. Cheeks about one-fifth as wide as the eye height. Ab- 

 domen short conical, bearing discal and marginal macrochaetae. Ovi- 



