.4 Monograph of Egyptian Di ptcra. 59 



51. 64. t, fig. 5. (1863); Rom... Atti. Soc. Ital. Sci. Nat. Milano, 

 XT. 26. (1868). 



- nrisi/s Schin., Fauna Austr., Dipt., I. 311. 42. var. (1862). 

 = flaviceps Bond., Dipterol. Prodr., II. 133. 18. (1857). 



= var.rufinasatus Big., Annal Soc. Entom. Fr., (6) IV. 88. 4. 



(1884). 



= var.algirus Macq., Explor. Scient. Alg., Zool. III. 469. 172. 

 t, IV. fig. 11. (1849); Beck., Mitteil. Zool. Mus. Berl., II. 84. 

 120. (1903); Verr., Brit. Fl., VIII., Cat, Syrph., 61. (1901). 



DIAGNOSIS: — Length of abdomen more than twice its 

 breadth; abdominal bands very conspicuous, always separated into 

 lunules in the female, though often connected in the male and 

 which extend over the side margins. Male with very large genitalia. 



DESCRIPTION:— Male: Face and frons entirely orange-yel- 

 low, but from the front mouth-edge there is a blackish line run- 

 ning about half way up the face, which becomes gradually narrow 

 and brownish above and then dies out; the jowls are also blackish. 

 The pubescence on the upper part of the frons is black and con- 

 spicuous down to below the antennae at the sides, but a large space 

 above and immediately below the antennae is quite bare; lower 

 down the hairs on the sides of the face are very pale and in- 

 conspicuous; the pubescence on the jowls and on the lower part of 

 the occiput is yellowish or almost white, but it becomes darker, al- 

 most orange on the upper part, and with no black hairs overhang- 

 ing the eyes. Vertex black and possessing black hairs. Eyes quite 

 bare. Antennae dark brown, but brownish-orange on the ventral sur- 

 face, which colour is often restricted to the base of the third 

 joint, but sometimes it is extended below, on the sides and above, 

 so that the antenna? appear reddish-brown; arista rather short, 

 brownish-orange and situated on the oval third joint, at a point 

 about one-third of its length from the base. Thorax moderately 

 shining seneous-blaek ; its pubescence is fairly dense and entirely 

 tawny or j'ellow; scutellum brownish-yellow with entirely yellow 

 pubescence. Abdomen ovate, about as long as the head and thorax, 

 but rather flat, and wider than the head and thorax; it is dull 

 black except at the base, apex, side margins, and on the hind- 

 margin of the fourth segment, where it is shining; there are three 

 pairs of orange markings, often varying greatly in size, followed 

 by two orange hind margins; the markings on the second segment 

 are the smallest, sloping slightly downwards, widely separated 

 and connected at their highest point with the side margins; the 



