MTCRODOX. 127 



each side ; proboscis retracted. Thorax subquadrate, wholly black, 

 dull owing to being strongly punctate, though shining on the 

 pleura; beneath, with very short yellowish pubescence ; scutellum 

 semicircular, punctate like the thorax, but bare and somewhat 

 shining, entirelv red, with a simple, rounded hind border. Meta- 

 notum shining black, wrinkled towards the middle above. Squamulas 

 and halteres white. Abdomen elongate, with almost parallel sides, 

 as broad as the thorax, but with the second segment a little dilated 

 on each side, punctate and pubescent like the thorax ; first segment 

 black ; second short, black in the middle, broadly red on the sides 

 and narrowly red on the hind border; it shows a sculpture 

 reminiscent of that of Omegatyrpkut, but much less developed; 

 third segment twice as long as the second, black, with the sides 

 and hind border red ; fourth twice as long as the third, red, with 

 t\vo more or less broad black spots on the sides ; genitalia red; 

 sometimes the second and third segments are wholly black, and 

 the fourth has only the hind border black; belly black, with yellow 

 hind borders to the first and second segments. Legs short and 

 almost bare, red, with coxa? and femora near the base black or dark 

 brown ; tirst joint of hind tarsi strongly swollen, deep black like 

 the following joints ; claws red, with black tips. Wings greyish 

 hyaline, with an elongate triangular dark spot towards the tip and 

 on the costal border, formed by pubescence ; veins strong and 

 black, normal ; snbapical cross-vein strongly recurrent ; external 

 lower corners of subapical and discal cells much rounded and 

 without an appendix. 



Type <3 , and two additional specimens from British East Africa, 

 Ifbagori's Village, edge of Kenia Forest, 5,000 feet, 12. ii. 1911 

 (T. J. Anderson). 



GROUP V. (inermis, Loew). 



This seems to be the most numerous and characteristic group of 

 31 it- rod on in the Ethiopian region. To it belong the larger and 

 more strikingly coloured species, some of which are very strange 

 and beautiful flies. 



The characters of the group are : Body and legs almost bare, 

 lightly punctate; ocelli in contact with each other and forming a 

 tubercle ; antennae elongate, the third joint sometimes as long as 

 the tirst ; frons and face very broad, the face not narrowed below ; 

 abdomen broader than the thorax at the base, attenuate behind, 

 conical rather than cylindrical in shape, the second segment simple 

 (with one exception) and the fourth segment in the male greatly 

 elongate, usually four or five times as long as the third ; first joint 

 of hind tarsi not or very little swollen. 



Of the present group three species have already been described, 

 viz. inermis, {Ethiopians, and ryf Afar, all of which I have included 

 in the following table, although the two last are not represented 

 in the collection : 



