'A Monograph of Egyptïan Diptera. 101_ 



blackish band ; rarely this segment possesses a médian black line, 

 which joins the two trianguïar bands on the iipper and lower 

 margins, as in ^S'. subtilis. The third segment is entirely yellow, 

 except for a broad dark brown band just above the lower margin 

 which is always yellow and shining ; sometimes this band is rather 

 broader than usual and occupies one fourth of the length of the 

 segment, and its upper margin is continned upwards in the niiddle 

 of the segment as an obscure blackish line, which, however never 

 reaches the shining upper margin of the segment. The fourth 

 segment is very shining seneous-black^ with its two basai corners 

 broadly greyish and its lower end more or less deep reddish-brown. 

 The fifth segment is very small^ rounded and shining black. The 

 pubescence on the abdomen is very inconspicuous and uniformly 

 pale, except for a remarkable fringe of white hairs on the upper 

 latéral margins of the second segment (where it runs forward at 

 the sides of the tirst segment), which constitutes the only obvions 

 pubescence on the abdomen. Venter transparent, l)lackish on the 

 basai half of the first segment, yellow to the end of the third 

 segment, then blackish to the tip of the genitalia. Hypopygium 

 small with a fairly large lamella which possesses a tuft of erect, 

 long, bristly hairs wdiich ends beneath the base of the fourth 

 segment. (PL II, fig. 12). Pubescence veiy short, inconspicuous 

 and uniformly i^ale. 



Legs black and orange; the two anterior pairs are entirely orange- 

 yellow with the knees rather broadly pale yellow, and the coxae 

 and trochanters dark orange-brown; their pubescence is fairly short, 

 whitish and inconspicuous. The very thick hind femora are entirely 

 shining and hâve their basai half (or more) orange beneath, but black 

 above, except for an orange-brown band about their iniddle, which 

 is really tlie extension of the orange colour below ; tne distal half 

 is blackish above and almost entirely blackish below, except for a 

 longitudinal orange-brown band. The femora, (PI. II, fig.8), possess a 

 strong and thick spine near the base, beneath, which is orange but 

 black at the extrême tip ; this tip ends in more than two minute, blunt 

 and roundish spines; besides this large spine, the fémur possesses on 

 its basai half, beneath, from two to six much smaller black spines 

 arranged almost in a straight line, but sometimes there is one near 

 the large spine and two or three others in a group and situated 

 at about the middle of the fenuir. The apical third of tlie fémur 

 is deeply serrated and the serration is on a raised ridge, behind 

 which, near the distal end, there are three or four much longer 

 spines. The hind tibiae are curved and blackish, with the base 

 light yellow, and a broad ring just after the middle yellow. The 

 hind tarsi are darkened above and the hind coxae (which are dark 



