A Monograph of Egyftïan Dïptcra^ 87_ 



nipted by a fairly large space in tlieir niiddle, wliich space is 

 equal in iengtli to that of tiie upper end of tlie stripe, the sutures 

 bemg situated in tli3 centre of thèse interruptions ; tlie lower 

 halves of thèse stripes extend some distance below the centre of 

 the tliorax and gradually decrease in width downwards ; the two 

 iniddle stripes ext end from the top of the thorax 'to abolit its 

 middle. Postalar calli very large, prominent and shining dark 

 brown. Scutellum crange-yellow, translucent and shining. Pubes- 

 cence of the thorax and the scutellum is light yellow, thiek ail over 

 but short and even. 



Abdomen orange-yellovv with transversc black niarkings ; the 

 basai segment is very pale yellow and shining ; the second segment 

 dull orange-yellow, except m the centre, where it is yellowish- 

 white anci its upper and lower margins which are dull black, 

 forming two fairly large and conspicuous black bands, which are 

 thicker tcwards the centre and gradually become thinner towards 

 the side margins ; the third segment has its upper haif whitish- 

 orange, except for its extrême upper nu^rgin which is deep orange, 

 and for a black elongate spot in the centre of this margin ; the 

 lower half of the segment is dark brown above, gradually getting 

 deeper below until it reaches the lower margin, which is deep 

 metallic black and traversed by a thick wavy whitish-yellow band, 

 which, on the sides of the segment is situated about tlve middle, 

 and in the centre much higher up, its upper edge almost touching 

 the upper margin ; the lower end of this segment i s very shining; 

 the hfth, sixth and seventh segments are black and almost comple- 

 tely retracted in the fourth. Pubesoence of the abdomen mamly 

 following the ground colour, fairly dense but short and slightly 

 longer and uniformly paler on the fourth segment. Venter 

 orange-yellow and opaque, rather deep coloured in the centre and 

 much lighter at the base ; the basai half of the fourth segment is 

 brown and its lower half black ; its pubescence is very thin and 

 scattered and almost ail pure white. 



Legs w ith the front and liiiul femora dark brown and with the 

 tip of the two front pairs yellow ; hind tibife dark brown, almost 

 black, except at the base where they are very pale yellow; they are 

 compressed* about the middle and rather twisted. Front and 

 middle tibise hâve their basai hal'/es pale yellow and their distal 

 halves brown ; front and hind tarsi with their dorsal surface dark 

 yellow, and their tips cîark brown dorsally, but paler below. Vesti- 

 ture of legs mainly following the ground colour, fairly short 

 except on the hind femora and tibiae, wh:re they are coarser and 

 longer. 



Wings pale yellowish-brown near the base, with a small 



