226 Syrphidae. 



Male. Frons and epistoma bluish black, shining; frons velvet 

 black pruinose above, epistoma slightly greyish pruinose towards the 

 sides. Vertex and frons black-haired; epistoma with erect, black hairs 

 at the sides; the central knob moderately produced, the mouth edge 

 rather retreating. Occiput bluish black, greyish at the margin; the 

 hairs pale yellowish. Antennæ smaller than in granditarsa, third joint 

 longer than broad, rounded at the end; they are black or blackish, 

 third joint more or less pale beneath at base, sometimes indistinctly ; 

 arista about as long as the antennæ, distinctly but short-pubescent. 

 Thorax æneous, somewhat shining, with three dull black, abbreviated 

 stripes; it is clothed with somewhat short, yellow hairs, longest at 

 the margin of scutellum. Pleura with a little longer and partly darker 

 hairs. Abdomen dull black, first and fifth segments somewhat shining; 

 on third segment there are two transverse or subquadrate yellow or 

 pale spots at the front margin, narrowly separated in the middle and 

 sometimes meeting here in front; at the basal corners of fourth seg- 

 ment are indications of small spots, at all events represented by 

 æneous, shining spots. Abdomen is clothed with short hairs, longer 

 at the sides towards the base ; they are yellow on the greater part of 

 second segment, except at the hind margin, and on the pale parts of 

 third segment and also at the front margin and corners of the fourth 

 segment, for the rest they are black; sometimes there are some pale 

 hairs just at the front corners of the fifth segment. Venter with the 

 anterior part of the segments shining bluish, the hind part dull black, 

 but on third segment the anterior part more or less whitish yellow; 

 it is clothed with longish, pale hairs on the anterior part, short, black 

 behind. Legs simple, front tarsi a little llattened; femora black with 

 the apical part yellow, most broadly on anterior femora; anterior 

 tibiæ yellow with a more or less distinct, blackish ring near the apex, 

 and the tarsi yellow ; hind tibiæ black with the basal part yellow and 

 hind tarsi black except the yellow last joint; hind metatarsi very 

 slightly thickened. The legs haired about as in gratiditarsa, but the 

 hairs behind the femora a little longer, and there are no bristly hairs; 

 the hairs are mainly dark. Wings rather tinged with brownish, especi- 

 ally about the middle. Squamulæ smoky with a darker margin and 

 a yellow fringe. Balteres orange. 



Female. Frons moderately broad, bluish black, black-haired, with 

 small but distinct side dust spots. Hairs on epistoma pale. Antennæ 

 a little larger than in the male. Thorax shining, without stripes. 

 Abdomen as in the male but the spots often confluent, sometimes 

 they are rather obscure and bluish æneous, and the front margin or 

 front corners of fourth and fifth segments with sunilar, narrow spots. 



