98 



Syrphidae. 



1. O. elegans Meig. 



1822. Meig. Syst. Beschr. III, 272, 14, Tab. XXX, Fig. 9. — 1843. Loew, 

 Stett. ent. Zeitg. IV, 275, Tab. III, Fig. 22 — 24. — 1843. Zett. Dipt. Scand. 

 II, 824, 8 et 1859. XIII, 6024,8. - 1862. Schin. F. A. I, 272. — 1907. 

 Kat. palæarkt. Dipt. III, 15. 



Male. Head somewhat short, about as high as broad; vertex at 

 the base nearly as broad as long, eye-suture about as long as vertex 

 or nearly so. Vertex, frons and epistoma metallic green, shining ; frons 



Heads of O. elegans. 

 Fig. 31. Male. Fig. 32. Female. 



with a more or less small dot-like impression, or this almost wanting. 

 Epistoma broad, a little widening downwards, broader than the dia- 

 meter of the eye; it is somewhat arched, on the middle almost keel- 

 shaped, above the somewhat protruding mouth-edge is a transverse 



Fig. 33. Antenna of O. elegans d", from the inside. X 80. 



impression which is polished, while the part above is fmely striated ; 

 just below the antennæ there is on each side at the eye-margin a 

 roundish or triangular, somewhat silvery dust spot. Vertex with pale 

 brownish hairs, frons and epistoma with few and inconspicuous pale 

 hairs. Oceiput greenish or bluish black, a little pruinose, with very 

 short dark hairs. Antennæ elongated, third joint linear, a little attenuated 

 outwards, about four times as long as broad; arista longer than the 



