]02 H. C. EFFLA TOUN. 



reddish-brown, as well as the trochanters), are covered with thin 

 vvhitisli dust. The pvibescence on the hind legs is also very short, 

 pale and inconspicuous. 



Wings pellucid with the stigma and the subcostal œil pale 

 yellow, as well as the other veins at the base ; the vena spuria is 

 very often obsolète, and sometimes with a very short faint line 

 présent at about its centre. Squamulse whitish with their niargins 

 yellowish ; the thoracal pair possess long délicate white fringes 

 which are composed of conipound hairs, but the alar pair with 

 coarser, simple whitish fringes which are only about one third of 

 the length of those on the thoracal pair. Haltères pale yellow 

 with the base brownish. 



Vemale: Eather similar to the maie but larger and stouter. 

 Frons ail covered with silvery wîîite dust and some white hairs, 

 exoept on a short spaoe just before the vert ex which is somewhat 

 shining black together with the latter. The front faosts of the 

 cyes are l.ess dilated than in the maie. The second segment of the 

 abdomen always with a central Black band, which nieets the.upper 

 and lower triangular bands and thus giving the yellow part of the 

 segment the appearance of being two large spots with almost 

 parallel margins ; thèse yellow spots are usually whiter towards 

 their distal ends, but redder towards the sides. Often the triangular 

 band at the base of the segment is absent, leaving the basai part 

 of the segment yellow, exoept in the centre, owing to the central 

 longitudinal band, which always reaches the basai margin. The 

 extrême lower margin of the second segment, is yellowish. The 

 third segment has its lower half blackish with the broad longitu- 

 dinal médian band reaching the basai margin, thus leaving the two 

 broad corners of the basai half of the segment whitish-yellow ; the 

 lower margin of this segment is yellowish-brown. The fourth 

 segment is elongated, tapering and pointed and entirely shining 

 black, except for two vellowish-white spots on the basai corners and 

 the extrême tip yellowish. The lirst three segments are ail dull 

 exoept for the lower margins of the second and third segments and 

 three spots (one in the centre near the base and two on the sides 

 near the lower margin), on the third segment, which are shining. 

 Venter rather more opaque and darker than in the maie. Hind 

 legs with the femora usually more orange, the spine near the base, 

 i.eJow, nuieh smaller and weaker than in tlie maie, and with tlie 

 hind tarsi usually much darker above. 



Length from 7i — 9 mm. 



S. sfinigera is one of the commonest Egyptian Syrphids and 

 oneof the most widely distributed. My records date from January 

 to November. It is known to occur in Africa, Asia Minor and 

 Scuth of Rurone. 



