176 Annals of the South African Museum. 



Male. Length 13'7 mm. ; wing 15 mm. 



Fetnnle. 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. 



Pronotuin clear, light yellow dorsally, unmarked. Mesouotal 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 ; trochauters 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 .B.J.+.-, and at the tip of the wing in cells R.^ and _R- ; a 

 sparse short pubescence in the apices of cells jR 5 and M l 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 brownish 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 

 caruuculated ; 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 dark brown, folded over the sternites ; valves 

 of the ovipositor slender. 



Habitat. South Africa. 



Holotype, <J, Malvern, Natal, 1901 (C. N. Barker). 



