.4 Moiiogniph of Egyptian Diptcra. 95 



resembling an uni. Tiie lliitd sc^inriit lins its iii.per hall iiearl\' 

 nlways aÙ orange, whilc its lowcr linlf nossesses a black bancl 

 which is (lecpef and wiiiev than lli- (Hic on the previous segment 

 and is also widest at its niiddle; tliis Idack band runs right 

 across the dise to tlio sidc-niargins bcioie thc orange hind niargin; 

 soraetinies this blaek liand is eontinucd upwards in the ecntre in a 

 thin black line to thc npii:r niargin. 'I1ic tonrth segment is lilaek- 

 ish with an orange liind margin, but is ridiei' inelincd \o grry 

 near thc front margin. 'Idie lifth segment is lilaek and rather 

 retracted in the fouvtli. T'ubcseenee vcit s1i;)i1 and ovoii nn the 

 thi^ee first segments, where it is iisually pale yellow; on the ionrlh 

 and fifth segments il is lojiger and denser. Venter orange willi the 

 black dorsal markings showing througli bv transpareney ; the sixth 

 and seventh segments are black and eompletelv retraeted into the 

 fifth; pubescence thinner but l:>ng,r than en tlie doi'suui. ilypn- 

 pygium asvnnnelrie and dull browii. Legs i)laek ami orange, the 

 orange being on the apical sixth of the front and middle f.MUMra, 

 the basai halves of the front and middle tibiœ and th- middle 

 metatarsi; the hind legs are cntirely Idack cxcept the apices of the 

 tibise whicli are brcwnish; the hind femora are considerablv dila- 

 ted and the hind tibiae are conspicuously eurved, (PI. II. fig. 4) com- 

 mencing with a jerk soon after the base; thèse hind tibiœ possess 

 beneath, an elongated groove, which is bordered on each side by a 

 fairly prominent ridge; the outer ridge is hollowcd beneath at the. 

 tip and resembles a short spine, while the inner on^e is prolonged 

 lower down to the base, also hollovvcd beneath at the tip and 

 resembles a strong eurved tcoth ; on the joint bctween the hind 

 tibias and tarsi there is a tnft of rcmarkable black globiferons 

 hairs, (PI. Il, fig. 7.). Pn.bescence on the anterior legs abnndant and 

 orange on the outer side only, the inner side heing quite bare and 

 somewhat shining; on the outer side of the posterior tibia; it is 

 longer, moie tufted and yellow, while on the inner side it is blackish. 



Wings grey and shining ; there is a small dark brown spot 

 under the end of the subcostal vein and a <listinct eross-vein from 

 the subcostal vein to Radius 1; Médian cross-veiii niuch undulated. 

 Squamulae large and pale yellow with dense ]>;i(e yellow fringes and 

 the dise orange. Haltères yellovr. 



Female : Similar to the maie but differs from it by the wide 

 séparation of the eyes and by the pubescence of the thorax, abdo- 

 men and legs being shorter and somewhat paler: also tlie central 

 black longitudinal band on the second segment of the abdomen is 

 very often interrupted in the middle, leaving only the top and the 

 base of th-e urn-shaped marking ; the tibiae, although conspicuously 



