108 SYRPUID ¥. 
the female the abdomen is black; but partly shining even on the 
second and third segments, exhibiting a distinct deep black pattern 
like that of the melee second segment on each side with a yellow 
spot, third with a small one on fore corners ; fourth with a yellow 
hind border; venter mostly black, with bands of whitish dust. Four 
anterior legs entirely yellow, with blackish cox ; hind trochanters 
brown and smooth; hind femora as in pipiens, but of a reddish- 
brown colour, broadly black at end, the basal half bearing some 
tubercles, of which the stronger and longer are situated towards the 
middle; these tubercles are more prom nent in the male. Hind tibie 
arched, reddish brown, with black bases and pale yellow knees ; 
in the male the hind tibia exhibits a notch with a tuberele on the 
inner side, for the reception of the long spine on the femur, when 
closed; in the female there is no trace Of this notch, but the lower 
apical angle is prolonged into a point which is longer than in the 
allied species; the femora of the female have also the strongest 
spine in the middle; hind tarsi blackish, not dilated. Wings 
hyaline, with black veins and a brownish stigma; vena spuria 
strongly chitinised, black. 
Type 3 and type 2 from Freetown, Sierra Leone, 17-26. vii. 
1899, collected by Mr. #. E. Austen of the British Museum, in 
whose honour the species is named; two additional females from 
Aiyangba, N. Nigeria, 11.i.1911 (Dr. J. J. Simpson), and another 
from Zungeru, N. Nigeria, 15. xi. 1910 (Dr. J. W. S. Macfie). 
Genus 22. EUMERUS, Mergen (182 
This genus seems to be represented in the Ethiopian Region bya 
great many very different forms, which are often distinguished by 
important structural characters, chiefly in the male sex. In the 
collection before me there are no species in which the eyes are 
separate in the male, although examples of such (as, for instance, 
ar penton’ and argyropsis, pate and rubiginosus ) have been 
described from South Afric The species can be tabulated as 
follows: it should be homer that erythrocerus, unicolor, and 
vestitus are not represented in the collection, and are included in 
the table only for the sake of comparison :— 
1 (G) Hind femora not thickened, with only 
x few small spines or bristles to- 
wards the end; species of very small 
size, rarely exceeding 5 to 6 mm. 
in length; eyes in the male ap- 
proaching each other only at one 
point, nos really in contact for any 
distance; hind border of scutelluim 
with very prominent small teeth, 
which are longer than usual; third 
antennal joint ‘broadly red or reddish 
brown; ocelli approximate, arranged 
in an equilateral triangle; male 
genitalia very large, bilobate, often 
protruding. 
