236 Orthorrhapha brachycera. 



be more probable; my researches prove however that the latter is the 

 case. In the coUection of Tonder-Lund we have two specimens, which 

 evidently are those which Fabricius had, when he made the state- 

 ment in Syst. Antl. The specimens are labelled " JJoUchopus diapha- 

 nus, ex Americæ insulis" ; the species is very like dia/plianus, but is 

 quite another species, with shorter antennæ and bare sCutellum; it 

 is evidently some American species very similar to diaphanus (but 

 not aJbicans Loew). A. diaphana thus does not occur in America, 

 and Dol. diaphanus in Syst. Antl. cannot be quoted under A. diaphana^ 

 but goes in as synonym under the American species in question. The 

 type to A. diaphana is certainly in Kiel. 



2. A. Loewii Kow. 



1878. Kow. Verhandl. zool. bot. Gesell. Wien, XXVIII, 446, 5, Taf. V, 

 Fig. 14. — 1903. Kat. palåarkt Dipt. II, 325. — Argyra alhkeps Stæg. 

 in litt. Zett. 1843. Dipt. Scand. II, 594. 



Male. Vertex and frons dark grey, whitish shining; eyes with pale 

 brownish or whitish brown hairs, palest downwards. Epistoma some- 

 what broad, brown, greyish shining when seen from above. Palpi 

 not small, dark greyish. Occiput grey pruinose; postocular bristles 

 black above, yellowish below, the lowermost somewhat brow^nish. 

 Antennæ black, slightly longer than the head, third joint about as 

 long as the two basal; arista considerably longer than the antennæ. 

 Thorax metallic green, with two faint, dark stripes in the middle; it 

 is somewhat brownish pruinose, shining; at the humeri it is whitish 

 grey; the thoracic disc and scutellum longish haired. Pleura some- 

 what æneous, grey pruinose; prothoracic bristles strong, black. Abdo- 

 men æneous or somewhat coppery, the second, third and fourth seg- 

 ments whitish pruinose, especially at the sides, and here most broadly 

 towards the front margin, the tifth and sixth segments somewhat 

 silvery. Abdomen is clothed with black hairs, and has somewhat 

 short hindmarginal bristles, long on the first segment. Venter dark 

 grey, with black hairs, which are long at the base. Legs yellow, 

 coxæ grey, front coxæ slightly yellowish brown at the apex; anterior 

 femora brownish black with the apical part yellow, hind femora with 

 the apical part brownish black; anterior tarsi blackish brown towards 

 the end, the tip of the hind tibiæ and the hind tarsi blackish; hind 

 metatarsus a little longer than the second joint. The legs are haired 

 about as in diaphana, the bristly hairs below the anterior femora 

 scarcely so long, on the hind femora distinctly shorter; anterior tibiæ 

 with two rows of dorsal bristles, middle tibiæ also with two rows of 

 smaller ventral bristles; the hind tibiæ with two dorsal rows; front 



