THE CANADIAN ENTOMOWGIST. 25 T 



the lower hairy part, a row of bristles at the oral margin. Distance from the 

 oral margin to base of eye equal to about one-third the eye height; sides of 

 lace covered with silvery pollen ; bare ; narrowest width not quite equal to 

 the length of the second antennal segment. Facial ridges bristly on the lowest 

 fourth. Facial depression silvery pollinose, without any carina. Antennae 

 reaching the lowest fourth of face, all three segments black; third segment 

 about one and one-fourth times as long as the second. Arista thickened on 

 basal two-fifths to one-half, the penultimate segment slightly longer than broad. 

 Width of front in both sexes about twice the length of the second antennal 

 segment ; the front silvery pollinose ; frontal vitta dull, dark-brown, at narrowest 

 point one and one-half to twice as wide as either side of front just cephalad of 

 the ©cellar triangle. One pair of orbital bristles in the male, two pairs in the 

 female. Ocellar bristles present in both sexes and proclinate, the single row 

 of frontal bristles descending almost to the base of the third antennal segment. 



Thorax subshining, black, covered with gray pollen ; scutellum gray pol- 

 linose on a black ground. Typically three sternopleural and four dorsocentral 

 macrochaetae but both sets are quite variable ; scutellum usually with three pairs 

 of marginal and one pair of cruciate apical bristles. Legs black, the middle tibiae 

 with two or more bristles on the front side near the middle, the hind tibiae with- 

 out a comb-like row of bristles on outer side. Wings hyaline. R4+5 (third vein) 

 with a group of two to five hairs both above and below at the junction with 

 R2+3. Bend of M^+o with a very short appendage in a few of the males, other- 

 wise destitute of an appendage. Tegulae white. 



Abdomen subshining; silvery pollinose on a black ground. Discal and 

 marginal macrochaetae present on the second, third and fourth abdominal seg- 

 ments. The hind margin of the third tergite somewhat arcuate in the male. 

 The fifth tergum in the male -marked off from the shining sixth by a suture, 

 longer laterally than medially, laterally about one-fifth the length of the lateral 

 part of the fourth tergum. The sixth and seventh abdominal segments in the 

 male forming the somewhat prominent genital segments. 



Genital segments of the male black. The basal part of the outer forceps 

 covered by a leaflike expansion. The basal part of the inner forceps with a 

 long median, keel-like projection. 



The indenture in the last sternite of the male extending half the dis- 

 tance toward the base of the sternite. 



Redescribed from the type material consisting of three males and four 

 females, from Brookings, S. D.. in the U. S. N. M., Washington. D. C. One 

 l)aratype transferred by courtesy of the collector. Dr. J. M. Aldrich, to the 

 Canadian National Collection. Ottawa. 



Ernestia longicarina sp. n. 



Description of male. Head at vibrissae almost as thick as at base of 

 antennae ; vibrissa-e far above the oral margin. Palpi yellow. Eyes hairy. Cheeks 

 (below the eyes) pale golden pollinose on a black ground, subshining on the 

 lower hairy part, a row of bristles at the oral margin. Distance from oral mar- 

 gin to base of eye equal to about one-third the eye height. Sides of face pale 

 golden pollinose ; bare ; narrowest width slightly less than the length of the 

 second antennal segment. Facial ridges bristly on the lowest fourth. Facial. 



