376 Orthorrhapha brachycera. 



T. spinigerellus is rare in Denmark; at Lersøen (Stæger), Faxe 

 Ladeplads (tiie author), and on Funen at Odense (H. J. Hansen). 

 Stæger's specimens iiad been examined by Zetterstedt. My dates are 

 in July. At Faxe Ladeplads it was present in some number at a 

 ditch, it was seen sitting on the water and flying quite low over it, 

 and the males hovered in the air above the females in the usual way. 



Geographical distribution : — Europe down into Spain and Italy, 

 and further in Egypt; towards the north to middle Sweden. 



Remarks: Schiner's description of the hind tibiæ seems to make 

 it uncertain that he has really had spinigerellus^ it woiild more refer 

 to monacanthus, but perhaps the tuft of hairs has been coalesced 

 so as to give the impression of a spine. 



2. T. monacanthus Loew. 



1859. Loew, Neue Beitr. VI, 21, 1, et 1864. Mon. Dipt. N. Am. II, 

 PI. VI, fig. 32. — 1884. Kow. Wien. Ent. Zeitg. III, 111. — 1903. Kat. 

 palåarkt. Dipt. II, 347. 



Male. Vertex and frons green, somewhat pruinose, especially at 

 the margin. Epistoma narrow downwards, white or greyish white. 

 Palpi greyish. Occiput green, greyish pruinose; postocular bristles 

 black above, yellow below. Antennæ black. Thorax green or æneous 

 green, somewhat brownish or greyish pruinose, slightly or almost not 

 shining. Pleura greenish, grey pruinose; propleura with very few, 

 pale hairs. Abdomen green or æneous green, clothed with short, 

 dark hairs, paler at the sides in front, and with short hindmarginal 

 bristles, longer on the first segment. Venter greyish, with pale hairs. 

 Legs yellow, posterior, especially middle, coxæ more or less grey; 

 front femora very slightly darkened above, sometimes almost not; 

 hind femora brownish or blackish above, and towards the apex all 

 round; hind tibiæ brownish, blackish in about the apical half; tarsi 

 with the apical part of metatarsus and the following joints blackish, 

 on the hind tarsi generally only the base of metatarsus pale. The 

 legs have short, blackish hairs, coxæ pale-haired, hind coxæ with a 

 black bristle on the outside; middle femora with four bristles below 

 at the base, the two middle ones strong, black, the two others smaller 

 and less black; middle tibiæ with two antero-dorsal and one postero- 

 dorsal bristle, and with two strong ventral bristles in the middle 

 near to each other; hind femora with longish hairs above; hind tibiæ 

 with the apical part a little thickened and bent a little forwards, the 

 thin basal part has a little elevation in the middle on the ventral 

 side; they are somewhat ciliated on the various sides and with bristles 

 above; on the ventral side, at the beginning of the thickening is a 



