290 Orthorrhapha brachycera. 



— Outer lamellæ not ending with a single, long hair; 



black coxal bristles 3—4 : 1 —2 : 1 3. anctum. 



4. Ventral lobes of hypopygium ending in a long, simple, 



curved hair; outer lamellæ short, triangular 4. caliginosum. 



— Ventral lobes of hypopygium ending in a long thread, 

 breaking up into hairs at the tip; outer lamellæ 



long, band-shaped 5. appendiculatum. 



Fem åles. 



1 . Goxæ all yellow 1 . fasciatum. 



— Posterior coxæ more or less grey 2. 



2. Hind femora with a preapical bristle 3. 



— Hind femora without a preapical bristle 4. 



3. Coxal bristles 3 : 1 — 2 : 1 , black (or those on front coxæ 

 white?, see under the species) ; arista not twice as 

 long as the antennæ ; front metatarsus shorter than 

 the four following joints, hind metatarsus a little 



shorter than second joint 2. monotrichiim. 



— Black coxal bristles 3-— 4 : 1 — 2:1; arista twice as 

 long as the antennæ; front metatarsus as long as 

 the four following joints, hind metatarsus consider- 



ably shorter than second joint 3. auctum. 



4. Smaller species ; hind tibiæ yellow 4. caliginosum. 



— Larger species; hind tibiæ brownish yellow or dark 



bpown 5- appendiculatum. 



1. X. fasciatum Meig. 



1824. Meig. Syst. Beschr. IV, 31, 9, Tab. XXXIV, Fig. 5 (Rhapkium), 

 et 1838. VII, 151, 9 {Forphyrops). — 1843. Zett. Dipt. Scand. II, 463, 5, 

 et 1849. VIII, 3060, 5 {RhapUum). — 1850. Loew, Stett. ent. Zeitg. XI, 

 126, 24 (Rhaphium). — 1862. Schin. F. A. I, 195 (Rhaphium). — 1903. 

 Kat. palåarkt. Dipt. II, 335. 



Male. Vertex and frons cyan-blue. Epistoma somewhat narrow, 

 silvery white, below the antennæ dark. Palpi small, yellow. Occiput 

 blackish, greyish pruinose; postocular hairs black above, whitish 

 below. Antennæ black, long, the third joint elongated, band-shaped, 

 about thrice as long as the short arista. Thorax dark, almost blackish 

 green, shining. Pleura dark green, greyish pruinose; propleural hairs 

 pale. Abdomen somewhat compressed, green or dark green, the 

 second and third segments yellow, with only the hind margin dark, 

 there are thus two yellow bands; sometimes also the fourth segment 

 a little yellow in front; abdomen clothed with short, blackish hairs, 

 and it has fme hindmarginal bristles, somewhat longer on the first 

 segment. Venter yellow, darker towards the apex, with pale hairs. 

 The ventral lobes of the hypopygium, as far as I could see, some- 

 what styliform, flat; the outer lamellæ somewhat lamelliform, not 



