THE CANADIAN ENTOMOLOGIST 413 



notum dull yellow, the prsescutum with three brown stripes; 

 wings subhyaline or with a very indistinct pattern; abdomen 

 yellow, trivittate with reddish brown; male hypopygium with the 

 ninth tergite large, flattened, narrowed posteriorly and with a very 

 deep median notch. 



Male. — Length 17 mm.; wing 17.7 mm. 

 Female. — Length 20 mm.; wing 17.5 mm. 



Frontal prolongation of the head moderately elongated, dull 

 brownish yellow, the nasus very small., Antennse of the male 

 moderately elongated, the scape yellow, the flagellar segments 

 uniformly pale brown; basal swelling of the flagellar segments not 

 conspicuous. Head brownish yellow. 



Thoracic dorsum dull yellow, the mesonotal prsescutum with 

 three dark brown stripes, the median one a little paler and bisected 

 behind, the lateral stripes continued backward on to the scutal 

 lobes; scutellum dark brown, more yellowish laterally; postnotum 

 dull yellow medially, brown on the sides ; a delicate capillary brown 

 line extends from the praescutum backward to the base of the 

 abdomen. Pleura dull yellow, the mesosternum and the mesepis- 

 ternites brown. Hal teres pale, the knobs, except the tips, paler. 

 Legs with the coxse dull yellow, the cephalic face of each more 

 brownish; trochanters dull yellow; femora yellow, the tips broadly 

 dark brown ; tibise and tarsi similar, the tips of the individual seg- 

 ments narrowly darker. Wings grayish, the stigma more yellowish 

 brown outwardly; a broad obliterative streak along the cord con- 

 tinued into the base of cell If*. Venation: basal deflection of 

 i?*+^ short or punctiform; basal deflection of Cu^ from one-third 

 to one-fourth the length of cell 1st M 2. 



Abdomen dull yellow, the segments narrowly ringed caudally 

 with silvery; tergites beyond the base with a narrow, indistinct, 

 reddish-brown stripe that is interrupted at the posterior margins 

 of the segments; lateral margins of the segments with a con- 

 spicuous triangular reddish-brown blotch; basal sternites yellowish, 

 terminal sternites darker coloured. Male hypopygium moderately 

 enlarged. Ninth tergite large, flattened, narrowed posteriorly, 

 with a very deep median notch, the lobes formed being elongate, 

 flattened, a little divergent, the tips subacute; the tergite is dark 

 brown on each side of the base, the apex yellowish. Ninth pleurite 



