THE CANADIAN ENTOMOLOGIST. 47 
the second segment and the apex of the first bright yellow; flagellar 
segments with the basal enlargement very prominent, blackened, 
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 l)efore the 
tubercle. 
Mesonotal prccscutum 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 coxae dusted with light gray; trochanters brow^nish yellow^; 
femora brown, the apex darker; tibia- 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 .hid Ri. base of R2 and Rz; a rounded blotch in cell M at two- 
thirds the length of the cell; pale flecks in cell Isl.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, somew^hat 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 yellow^ish 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 wnth a 
