228 THE CANADIAN ENTOMOLOGIST 



jiollinose on a black ground, tinged reddish at the apex. Three sternopleural 

 bristles and four pairs of dorsocentrals ; scutellum with four pairs of marginal 

 bristles and an apical pair that may, or may not, be cruciate. (These are 

 broken off in the type specimen). Legs black, the middle tibiae with two or 

 more bristles on the front side near the middle, the hind tibiae without a 

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

 with a group of two to five hairs at the base on both the upper and lower 

 surface. M^+o with a distinct appendage at the bend. Tegulae white. 



Abdomen subshining ; silvery pollinose on a black ground, the lateral 

 parts of the first three segments somewhat rufous. Discal bristles absent on 

 segments one. two and three, a pair of median marginal macrochaetae on 

 segments two, three and four. The fifth tergum distinctly marked off from 

 the sixth; the greatest width of the fifth equal to about one-fifth the narrowest 

 width of the fourth segment. The sixth abdominal segment about three- 

 fourths the length of the fourth and forming a conspicuous genital segment. 



The black-colored genitalia are characterized by the absence of a keel- 

 like projection at the base of the inner forceps, by the extraordinary length of 

 the apical blade-like portion of the inner forceps and by the unusual degree of 

 lateral compression of each of the apical portions of the outer forceps. The 

 broad, leaf-like expansion covering the base of the outer forceps in so many 

 of the Brncstia species is lacking in this species. 



The indenture of the fifth sternite extends nearly to its base. 



Described from a single male taken by Mr. E. C. Van Dyke at Lake 

 Tahoe, California, on September 15th. 



Type in the Canadian National Collection at Ottawa. 



Ernestia frontalis sp. n. 



Description of Male. Head at vibrissae about as thick as at base of 

 antennae; vibrissae close to the oral margin. Palpi yellowish at tip, infuscate 

 below. Eyes hairy. Cheeks (below the eyes) white polhnose on a black 

 ground, subshining on the lower hairy part, a row of stouter hairs or bristles 

 at the oral margin. Distance from the oral margin to base of eye equal to 

 about one-third the eye height. Sides of face covered with silvery pollen; 

 bare; narrowest width slightly less than the length of the second antennal 

 segment. Facial ridges bristly on lowest fourth. Facial depression silvery 

 pollinose, without any carina. Antennae reaching the lowest fourth of the 

 face, all three segments black; third segment about one and one-fourth times 

 as long as the second. Arista thickened on basal half, the penultimate seg- 

 ment slightly longer than broad. Width of front at narrowest point measuring 

 about three-fourths the width of an eye and about twice the length of the 

 second antennal segment ; the front silvery pollinose ; f roi tal vitta dull, dark- 

 brown, at narrowest point fully twice as wide as either side of front just 

 cephalad of the ocellar triangle. No orbital bristles, the proclinate ©cellars 

 somewhat weak; the single row of frontal bristles descending to the base of 

 the third antennal segment. 



Thorax subshining, black, covered with gray pollen, scutellum gray 

 pollinose on a black ground that becomes rufous toward the apex. Three 

 sternopleural bristles and typically four dorsocentrals; scutellum with three 



