416 Syrphidae. 



fluent spots, especially confluent to a dark space above, and the whole 

 hind margin likewise dark; the eyes are haired with longish, brown 

 hairs. Antennæ with the basal joints black, third joint somewhat 

 large, roundish square, blackish or brownish, generally paler beneath; 

 arista brown, apparently bare. Thorax black, somewhat shining, with 

 velvet black stripes; the stripes are one, or two approximated, in the 

 middle, two to each side, and one short and indistinct more laterally ; 

 the middle and the inner lateral stripes are generally united behind 

 to a velvet black space in front of scutellum, and the outer lateral 

 stripes are interrupted at the transverse furrow; the shining stripes 

 between the middle stripe and the inner lateral stripes are more or 

 less greyish in front ; further the stripes between the two inner lateral 

 stripes are brownish yellow in front, and likewise a stripe exterior to 

 the outer lateral stripes, united with the greyish hunieri; there are 

 thus four more or less distinct, brownish yellow, short stripes in front. 

 Thorax is clothed with long, yellow hairs, a little mixed with black 

 at the sides and behind. Scutellum black, shining, with black hairs, 

 paler along the margin. Pleura with longish, black hairs, paler behind. 

 Abdomen rather short, æneous green, shining, second and third seg- 

 ments duU velvet black except at the hind margins and on a side 

 space, prolonged triangularly inwards in the middle, fourth segment 

 with a small, velvet triangle in the middle at the front margin. Ab- 

 domen is clothed with rather long hairs which are yellowish, but black 

 on the hind part of second, third and fourth segments. Venter æneous 

 black, with long, pale hairs. Legs black, the tips of anterior femora 

 and about the basal third of the tibiæ pale yellowish, hind tibiæ yel- 

 lowish just at the base; middle tarsi yellowish at the base; hind 

 femora considerably thickened with the upper margin curved and 

 with an impression on the anterior side after the middle; hind tibiæ 

 somewhat compressed and curved, hind metatarsi a little thickened. 

 The long hairs behind the anterior femora are black on the front 

 femora except at the base, on the middle femora mainly yellow but 

 black at apex; the hind femora are long-haired above and especially 

 below, the hairs are black except at the base, and Itelow they are 

 yellow but on the apical third are shorter, dense, black, somewhat 

 bristly hairs; the anterior tibiæ are somewhat long-haired above and 

 behind, especially middle tibiæ, the hairs mainly dark; hind tibiæ 

 fringed above and below, the hairs black on the basal, yellow on the 

 apical part. Wings hyaline ; upper marginal cross-vein recurrent above, 

 the veinlets at apex of subcostal and first posterior cells turned up- 

 wards; radial vein with fine bristles on its basal part; cubital vein a 

 httle angular at the base and here often with a more or less distinct 



