THK (ANADIAN lATOMOI.OCIST 199 



Male— Rosiriini and palpi light brownish-ycIIow; front and 

 vertex very dark coloured, occiput similar. Antenna?, segment one 

 Itlack, segment two black at base, brown apically, segment thr-e 

 yellowish on basal hall', black apically, remainder of antenna- black; 

 antenna- very long, as long iis the body; segments one and two 

 short, the third segment very long, segments 4 to 1.') long, gradually 

 shortening, terminal segment ver\- short. 



Thoracic pronotiim deep bluish-black; mesonotiim. inchiding 

 the i3leur;e similar. Halteres rather pale dull whitish. I'orc legs 

 with yellow coxa, dark at ba.se, yellow trochanter, yellow femur 

 broadly tipped w^ith blackish, yellow tibia narrowb tipix-d with 

 blacki.sh, metatarsus ycllowi.sh-brown — darkened into brownish- 

 black at the tip, remaining tarsal .segments brownish black; middle 

 and hind legs similar, but their coxa- blackish and the black femoral 

 tips narrower. Wings with cell C yellowish brown, Sc and R more 

 \ellowish, remainder of wing hyaline or nearly so, a brown mark at 

 the base of thewingin thencighbourh(;odofcross-veinh,across-band 

 at the cord, often irregular, often a rounded brown spot on vein 

 Cu.i midwa\- between cross-vein m-cu and the tip of the \ein, brown 

 marks at end of vein Ri. fork (f R4,:, and fork of M. 

 Wnation (see i^late II!., tig. 7); Rs ver\ short, much si., rter than 

 cross-vein r-m, basal deflection of R1-5 short but distinct, about 

 one-half as long as Rs, cross-vein m-cu long, curved, longer than the 

 basal deflection of Cu.\, placed opposite or very slighth- be>(>nd 

 cross-vein r-m. 



Abdomen, Isi segment very short, 2nd a little longer than 

 the 4th, 3rd very long, as long as the succeeding 4 segments 

 combined, segments 4 - 8 successiveh- shorter. .Abdomen 



dark brownish black, basal half of segment 4 orange. Hy])o- 

 p\gium, 8th tergile narrow, short, widely .separated from the .some- 

 what broader 8th sternite, 9th tcrgite viewed from abo\e very 

 deeply incised, this incision rectangular, the caudad projecting 

 lateral lobes arc somewhat swollen basalK-, narrowed behind, 

 slightly enlarged at the tips, densely clothed with long black hairs, 

 between the lateral arms is a small rounded lobe, directed caudad ; 

 the 9th pleurite reaches the 8lh tergite, the flth tergite and 9lh 

 sternite being more widely separated; the 9th tergite is triangular, 



