294 Orthorrhapha brachycera. 



Female, Epistoina broad, whitish grey ; palpi large, grey. Antennæ 

 short, the third joint almost as broad as long, somewhat stubby, the 

 arista twice as long as the antennæ. Scutellum steel-blue as in the 

 male. Wings brown. 



Length 3,8 mm. 



X. audum is very rare in Denmark, we have only one specimen, 

 a female, taken on Funen at Odense (H. J. Hansen). I take it to be 

 auctum on account of its short antennæ, the preapical bristle on the 

 hind temora, the number of coxal bristles, the relative length of the 

 tarsal joints, and the steel-blue scutellum. 



Geographical distribution: — Northern and middle Europe down 

 into Austria; its northern limit is in Denmark, and it occurs in 

 England. 



4. X. caliginosum Meig. 



1824, Meig. Syst. Beschr. IV, 29, 4 {Rhaphium), et 1838. VII. 151,4 

 (Forphijrops). — 1843. Zett. Dipt. Scand. II, 461, 4 p. p., et 1849. VIII. 

 3059, 4, et 1853. XI, 4274, 4 (Rhaphium). — 1850. Loew, Stett. ent. 

 Zeitg. XI, 130, 28, Tab. I, F-ig. 32— 33 (Rhaphium). - 1862. Schin. F. A. I, 

 194 (Rhaphimn). — 1903. Kat. palåarkt. Dipt. II, 334. — ■ Hydrochus lati- 

 cornis Fall. 1823. Dipt. Suec. Dol. 6, 3 p. p. — Rhaphium. macrocermn 

 Meig. 1824. Syst. Beschr. IV, 29,3, et 1838. VII, 151,3 {Porphijrops). — 

 1843. Zett. Dipt. Scand. II, 460, 3 p. p. — Forphyrops nemoralis Meig. 

 1824. Syst. Beschr. IV, 52, 15. — Rhaphium xiphias Meig. 1824. ibid. 

 IV, 30, 5. — Porphijrops xiphias Meig. 1838. ibid. VII, 151, 5. 



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

 silvery white. Palpi small, grey. Occiput slightly greenish, grey 

 pruinose; postocular hairs black above, white below. Antennæ black. 



Fig. 91. Antenna of X. caliginosum c?. X 60. 



long, the third joint very elongated, band-shaped, about four times as 

 long as the very short arista. Tliorax dark greenish, æneous or some- 

 what coppery, shining; scutellum brighter green or sometimes bluish. 

 Pleura greenish, grey pruinose; propleural hairs pale. Abdomen 

 æneous or coppery, clothed with short, black hairs, a little longer 

 and pale at the sides in front ; there are hindmarginal bristles, longer 

 on the first segment; the eighth segment with short hairs. Venter 



