THE CANADIAN ENTOMOLOGIST 245 



Allied to T. whitneyi; general colour of the head and thorax 

 light gray; a narrow, brown or black dorso-median vitta extends 

 the length of the thorax and abdomen; antennae black; femora 

 strongly incrassated ; wings indistinctly marked with pale brownish 

 clouds; abdomen reddish yellow with a brown dorso-median black 

 stripe. 



Male. — Length 10.2 mm.; wing 11.7 mm. 



Palpi dark brown. Frontal prolongation of the head moder- 

 ately elongated, deep chestnut-brown, above sparsely dusted with 

 gray; nasus lacking. Antennae dark brown, the scapal segments a 

 little more reddish and sparsely dusted with gray; flagellar seg- 

 ments rather short, deeply incised, the basal swelling shorter than 

 the pedicel of each segment. Head gray, the vertical tubercle 

 large, prominent, with an indistinct, brown median line that 

 becomes indistinct behind; eyes very small, widely separated. 



Thorax light gray, the usual praescutal stripes not very dis- 

 tinct, the median one tinged with brown; scutellum more reddish 

 with an indistinct, median brown line; postnotum gray with a 

 brown, median line. Pleura light gray, the dorso-pleural mem- 

 brane obscure yellowish. Hal teres light brown, the knobs a 

 little darker brown. Legs with the coxae long and powerful, light 

 gray; trochanters chestnut-brown; femora short and stout, con- 

 siderably incrassated apically, reddish brown; dark brown at the 

 tips; tibiae dull brownish yellow, the tips darkened; tarsi dark 

 brown, the metatarsi paler. Wings slightly crumpled, possibly 

 the first indications of degeneracy; membrane indistinctly blotched 

 with brownish; cells C and Sc a little more yellowish; stigma in- 

 distinct, brown; clouds of brown at the origin of Rs; along the 

 cord in cell M; apex of cell 1st A, etc. Venation: vein R2 per- 

 sistent but pale at its tip; cell 1st M2 very small and short, only a 

 little longer than broad; fork of cell Mi deep; cross-vein m-cu 

 obliterated by the fusion of Cu\ on M 3+4. 



First abdominal tergite brownish basally, the remainder of 

 the dorsum of segments 1 to 8 light reddish yellow, the 

 segments broadly ringed with yellowish; a very conspicuous 

 black median vitta runs the length of the abdomen, inter- 

 rupted only by the yellow caudal margins to the segments; this 

 vitta begins on segment 1 and continues to the eighth tergite; 



