A Monograph of Egyptian Diptera. 43 



near the base to the postalar calli ; there is a large elongate light 

 yellow spot on the mesopleurse, at right angles to the side lines 

 of the thorax, and a small yellow spot on the sternopleurse in a 

 straight line with the elongated spot above it; pubescence on the 

 thorax is dense blackish-brown, but rather short and inconspic- 

 uous ; it is longer and tawny on the sides and still longer and 

 paler on the pleurae. Scutellum dull yellow with pale hairs on the 

 disc, but with a row of even and longish yellow hairs on the 



°in. 



Abdomen elongate, almost as wide as the thorax and witb the 

 side margins almost parallel; it is dull brownish-black but shining 

 on the lower margins of the segments and with conspicuous yellow 

 or orange-yellow bands which extend over the side margins. The 

 basal segment is shining black and possesses two yellow, roundish, 

 lateral spots, which extend only a little way on the dorsum ; the 

 second segment possesses a broad orange-yellow transverse band, 

 which is nearly as wide as half the length of the segment and 

 situated in the middle of the segment ; this band is more or less 

 deeply constricted in the centre and sometimes interrupted ; the 

 orange-yellow band on the third segment is quite continuous, as 

 wide as half the length of the segment, and is situated on the 

 upper half (i.e. its upper margin near the basal margin of the 

 segment) ; the fourth segment has a yellow hind margin and an 

 uninterrupted yellow band which occupies exactly the upper half 

 (i.e. from the upper margin to the middle of the segment); in 

 these two last .segments, the dark background is often much faded, 

 and gives the effect of the colours running together, and hence 

 the contrast is much less conspicuous than in the second segment ; 

 the fifth and sixth segments are reddish-brown and sometimes the 

 upper margin of the fifth segment is dark brown with a yellowish 

 hind margin ; pubescence on the abdomen very short, inconspicuous 

 and mainly following the ground colour except on the first segment 

 and the upper half of the second segment, where it is longer and 

 very pale. 



Venter pale yellow and very transparent en the three basal 

 segments where the dark background of the dorsum shows through; 

 on the four apical segments it is brown or dark brown witli darker 

 places ; on the second and third segments there are two median, 

 oval, brown or blackish spots, which are situated on the lower 

 half of the segment, and the spot on the second segment is larger 

 than the one on the third. Hypopygium dark reddish-brown and 

 lather shining ; pubescence on venter very scarce, short, pale and 

 inconspicuous. 



Legs entirely yellow except the front coxae, the three middle 

 joints of the front tarsi and the three apical joints of the 



