108 



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 male ; 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 coxae ; 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 prominent in the male. Hind tibiae 

 arched, reddish brown, with black bases and pale yellow knees ; 

 in the male the hind tibia exhibits a notch with a tubercle 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 $ and type 9 from Freetown, Sierra Leone, 17-26. viii. 

 1899, collected by Mr. E. 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. Hacfie}. 



Genus 22. EUMERUS, Meigen (1822). 



This genus seems to be represented in the Ethiopian Region by a 

 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, 

 argenteus and argyropsis, jacobi and rubifjinosiis) have been 

 described from South Africa. The species can be tabulated as 

 follows : it should be remarked that erythrocerus, unicolor, and 

 vestitus are not represented in the collection, and are included in 

 the table only for the sake of comparison : 



1 (0) Hind femora not thickened, with only 

 a few small spines or bristles to- 

 wards the end; species of very small 

 size, rarely exceeding 5 to 6 mm. 

 in length ; eyes ill the male ap- 

 proaching each other only at one 

 point, not really in contact for any 

 distance ; hind border of scutelluni 

 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. 



