.4 Monograph of Egyptian Diftera. 113 



coarsely punctate and consequently more shining aeneous than the 

 thorax, with its lower margin covered with dirty white dust ; its 

 pubescence is longer than that of the thorax and consists of dark 

 grey or tawny hairs on the disc and longer, very characteristic 

 tawny-yellow bristly hairs on the lower margin. 



Abdomen black, coarsely punctate, mostly dull and almost 

 entirely covered with grey and tawny-yellow dust, which is much 

 thicker on the two pairs of lunules, (one pair on each 

 of the second and third segments), and on the apical 

 half of the fourth segment, as well as on the lower margin of 

 the third segment. The lunules on the second and third segments 

 are fairly large and conspicuous with black punctations, the pair 

 of lunules on the second segment being narrower and their inner 

 ends more remote from each other than those on the third segment ; 

 the fourth segment is covered with greyish-yellow dust, which is 

 coarsely punctate with black, except for the broad basal corners 

 which are free from dust, as well as a thin median transverse 

 basal line which is continued in another thin vertical, median line 

 downwards to about one-third the length of the segment ; in other 

 words, the fourth segment possess two broad lunules, the lower 

 margins of which are indistinct owing to the dust entirely covering 

 the lower part of the segment, although the dust on the lunules is 

 paler and brighter. Pubescence on the abdomen is fairly dense 

 and short, mainly following the ground colour, but with a few 

 rusty-yellow hairs on the disc, except for a fringe of grey hairs 

 on the puffed out basal corners of the second segment, which is 

 the broadest part of the abdomen. Hypopygium asymmetrical and 

 black. 



Legs black, with the knees of the two anterior pairs 

 broadly yellow, also the extreme base of the posterior tibia?, the 

 ventral side of the very swollen hind metatarsi and all the front 

 tarsi are yellow. The posterior femora are very swollen and bear 

 two rows of black spines on their lower distal ends ; the hind 

 tibiae are also rather swollen ; the hind metatarsi are about as 

 broad as the broadest part of the tibiae, triangular, flat below, 

 and ending above in a sh?irp ridge. The middle tibiae have 

 distinct spurs and the four basal joints of all the front, middle 

 and hind tarsi are spurred ; these spurs are usually yellow on the 

 front legs and black on the middle and hind legs. The pubescence 

 on the front legs is fairly long and whitish but occurs only on the 

 upper surface and sides ; on the hind femora and tibiae the 

 pubescence is also whitish, but more erect, longer and rather 

 tufted. The four basal joints of the hind tarsi bear on their lower 

 surface and sides very short but erect and tufted rusty-yellow 7 



