9 |. SYRPHID ¥. 
antenne, with a rounded prominent tubercle, which is united below 
with the epistoma ; peristoma narrow, not produced ; lower posterior 
orbits white pollinose and white pilose ; opening of the buccal cavity 
broad, ovate. Thorax black, dark pollinose and with very short pale 
hairs on the back, without distinct pattern, reddish on the humeri 
and on the pro- and mesopleura; scutellum dark reddish, with 
short pale hairs. Squamule pellucid, with a whitish fringe; 
halteres whitish. Abdomen elongate, almost cylindrical, oraduaily 
attenuated behind; it is entirely black, dark grey pollinose, 
brownish towards the end, with short grey hairs; second and third 
segments with a narrow yellow hind border ; venter grey ; genitalia 
rounded, brownish red. ~The four front legs, including the coxe, 
dark red, with black grey-pollinose tibiz and tarsi; hind legs with 
more blackish coxe and femora, which are ereatly aeaied and 
bear black bristles, but are not soothed below ; hind tibixe curved, 
reddish, the tarsi black. All the hairs on the legs are pale. Wings 
narrow, greyish hyaline, very thinly pubescent ; costal cell yellow- 
ish ; chee black spot filling the ends of the marginal and submarginal 
dais. not passing the third longitudinal vein, bat touching the Gaeta 
infront and reaching the kink in the third vein; marginal cell 
shortly stalked ; kink in the third vein narrow and tr iancular, but 
its fore branch straighter and more perpendicular than the hind 
one ; small cross-vein curved and placed a little beyond the middle 
ot the discal cell; vena spuria chitinized ; outer lower corner of the 
discal cell rounded, not appendiculate; second basal cell not 
dilated at the end above; anal cell dilated towards its middle. 
Type S,a single rather old and badly preserved specimen from 
South Africa (R. W. Plant). 
Genus 17. HELOPHILUS, Jeigen (1803). 
Subgenus MESEMBRIUS, Rondani (1857). 
All the species in the collection belong to this subgenus, which 
is very characteristic of the Ethiopian fauna, and they all have the 
elobiferous hairs at the base of the hind tarsi. They ean be dis- 
tinguished as follows :— 
1 (10) Thorax with very sharply defined black and 
yellow stripes on the back. 
2 (5) Hind femora of the male witbout a brush- 
like tuft of black hairs on the inner side 
near the base. 
3 (4) Middle tibie of the male with the long 
yellow pubescence present also on the 
anterior side and extending only to the 
first joint of the tarsi; hind tibiwe black ; 
first yellow abdominal band of the female 
interrupted in the middle ............ capensis, Macq. 
(3) Middle tibiwe of the male with the yellow 
pubescence only on the posterior side and 
extending te the four first joints of the 
ee 
