THE CANADIAN ENTOMOLOGIST 199 



Male. — Rostrum and palpi light brownish-yellow; front and 

 vertex very dark coloured, occiput similar. Antennae, segment one 

 black, segment two black at base, brown apically, segment three 

 yellowish on basal half, black apically, remainder of antennae black; 

 antennae very long, as long as the body ; segments one and two 

 short, the third segment very long, segments 4 to 15 long, gradually 

 shortening, terminal segment very short. 



Thoracic pronotum deep bluish-black; mesonotum, including 

 the pleurae similar. Halteres rather pale dull whitish. Fore legs 

 with yellow coxa, dark at base, yellow trochanter, yellow femur 

 broadly tipped with blackish, yellow tibia narrowly tipped with 

 blackish, metatarsus yellowish-brown — darkened into brownish- 

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

 and hind legs similar, but their coxae blackish and the black femoral 

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

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

 the base of the wing in the neighbourhood of cross-vein h , a cross-band 

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

 Cu.i midway between cross-vein m-cu and the tip of the vein, brown 

 marks at end of vein Ri, fork of R4+5 and fork of M. 

 Venation (see plate II!., fig. 7); Rs very short, much shorter than 

 cross-vein r-m, basal deflection of R4+5 short but distinct, about 

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

 basal deflection of Cu.i, placed opposite or very slightly beyond 

 cross-vein r-m^ 



Abdomen, 1st segment very short, 2nd a little longer than 

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

 combined, segments 4-8 successively shorter. Abdomen 

 dark brownish black, basal half of segment 4 orange. Hypo- 

 pygium, 8th tergite narrow, short, widely separated from the some- 

 what broader 8th sternite, 9th tergite viewed from above very 

 deeply incised, this incision rectangular, the caudad projecting 

 lateral lobes are somewhat swollen basally, 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 8th tergite, the 9th tergite and 9th 

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



