THE CANADIAN ENTOMOLOGIST. 47 



the second segment and the apex of the first bright yellow; flagellar 

 segments with the basal enlargement very prominent, lilackened, 

 the remainder of the segments dark brown, the apical segments 

 more uniform; antennae elongated for this group of species. Head 

 brownish gray, clearer and brighter toward the occiput and around 

 the eyes; the vertex with a low tubercle bearing an impressed 

 median line; a circular to transverse impressed mark just behind 

 the base of the antennae meeting on the middle line before the 

 tubercle. 



Mesonotal praescutum light gray, the stripes darker gray to 

 brown, narrowly margined with dark brown; the median stripe is 

 bisected by a pale line, which is likewise margined with brown; 

 scutum brown with two light gray spots on each lobe, the largest 

 lying caudad and proximad; scutellum and postnotum light gray, 

 with a narrow brown median line. Pleura with the dorso-pleural 

 membrane dull yellow, the sclerites light gray with a rounded 

 blown spot just beneath the anterior spiracle and a smaller one on 

 the mesopleura. Halteres light yellow, the knob brown. Legs 

 with the coxse dusted with light gray; trochanters brownish yellow; 

 femora brown, the apex darker; tibiae brown, lightest at the base; 

 tarsi brown. Wings with a light gray tinge, the costal cell more 

 yellowish, stigma brown; a brownish blotch at the arculus and the 

 origin of Rs; veins and the deflections of veins narrowly seamed 

 with brown; hyaline spots before the cord, beyond the stigma in 

 cell 2nd Ri, base of R2 and Rs; a rounded blotch in cell ili at two- 

 thirds the length of the cell; pale flecks in cell 1st. A. 



Abdominal tergites varying- from almost clear yellow through- 

 out to a brownish yellow, the caudal margin narrowly yellowish, 

 the lateral margins narrowly grayish; the base of the tergites with 

 a transverse rectangular coarsely punctured area on either side of 

 segments 3 to 5, somewhat as in T. discolor Loew and similar species; 

 second sternite brownish yellow with a large rounded black spot 

 at the base; segments two to five with punctured areas on the sides 

 of the sclerites, on segments two, four and five transverse, on seg- 

 ment three oblique; apical sclerites brown, broadly yellowish on 

 the caudal margin. Ninth tergite yellowish, the caudal margin 

 with a small, shallow, rounded or rectangular median notch, the 

 lateral lobes broad, obliquely truncated; dorsal surface with a 



