176 Annals of the South African Museum. 
Male. — Length 13-7 mm. ; wing 15 mm. 
Female. — Length 21 mm. ; wing 16"5 mm. 
Frontal prolongation of the head very short, light yellow, the nasus 
elongate ; palpi pale brown. Antennae moderately elongated ; scape 
yellow ; flagellar segments dark brown toward the tip of the organ ; 
basal swelling of the individual segments a little darker than the 
pedicels ; segments of the flagellum a little constricted beyond the 
base. Head light yellow ; frontal tubercle low, entire, at its base 
along the inner margin of the eyes a small brown spot ; occipital 
blotch elongate-triangular, dark brown. 
Pronotum clear, light yellow dorsally, unmarked. Mesonotal prae- 
scutum dull yellow with three black shiny stripes ; lateral stripes curved 
outwards at their anterior ends ; scutal lobes shiny black ; scutellum 
and postnotum dull yellow, brownish black on the sides, slightly 
darkened caudally. Pleura pale with a whitish cast, indistinctly 
marked with yellow ; an elongate dark brown mark on the propleura. 
Halteres yellow, the knobs brown with the apices paler. Legs with 
the coxae pale yellow ; trochanters and femora dull yellow, the latter 
broadly dark brown at their tips ; tibiae and tarsi dark brown. Wings 
with a yellowish or greyish-yellow tinge, the costal cell a little brighter ; 
stigma distinct, oval, dark brown ; a brown seam along the basal de- 
flection of -B4+5 and at the tip of the wing in cells E.^ and Br,; a 
sparse short pubescence in the apices of cells B^ and M^ and on the 
stigma. Venation as on Plate XII, fig. 37. 
Abdomen light yellow, the basal third of the first tergite brownish ; 
a black baud near the tip of the abdomen, including all of segment 
seven, the apex of the sixth tergite, the extreme base of the eighth 
tergite and the eighth sternite ; an indistinct Ijrownish spot on the 
extreme lateral margins of the basal segments ; hypopygium yellow. 
Male hypopygium with the ninth tergite (Plate XIV, fig. 65) rather 
short, broad ; caudal margin with a U-shaped notch, lateral angles 
beneath produced into blunt darkened lobes that are roughened and 
carunculated ; caudal margin of the incision beneath is darkened, 
provided with numerous small acute teeth ; a small rounded median 
notch ; pleural suture prominent, curved strongly dorsad at its tip ; 
outer pleural appendage pale, elongated, the tip attenuated. 
In the female the black abdominal band occupies the seventh and 
the apical two-thirds of the sixth tergites, and the lateral margins of 
the tergites are broadly dai'k brown, folded over the sternites ; valves 
of the ovipositor slender. 
Habitat. — South Africa. 
Holotype, (J, Malvern, Natal, 1901 (C. N. Barker). 
