532 Syrphidae. 



joint and arista microscopically hairy. Epistoma straight, not hollowed, 

 without central knob and not descending; it is blackish or æneous, 

 but more or less, generally densely pale pruinose and it has longish, 

 somewhat dense hairs. Jowls small and not descending, with a small 

 pit in front, but there is no furrow stretching upwards. Oral cone 

 and proboscis somewhat short; clypeus horse-shoe-shaped with the 

 basal part small. Labrum [sabulonum] short, strong and high at the 

 base, strongly semitubular; the median process broad, cleft, irregularly 

 serrated or dentate at the margin; the upper lateral processes shorter, 

 conical, with small teeth on the margin; the lower lateral processes 

 considerably longer than the others, broad and broadened at the apex, 

 which is aimost circularly rounded, turned a little upwards; the usual 

 lateral rows of small papillæ present on the inside of labrum; hypo- 

 pharynx as long as labrum, with nearly parallel sides, rounded at the 

 apex; maxillæ somewhat shorter, relatively short and broad, nearly 

 straight, not or slightly knife-shaped, and rounded at the apex; they 

 have the usual microscopical spines in rows and the spines are rather 

 distinct, directed inwards and specially distinct at the inner margin 

 and the apex; palpi quite short, half as long as lacinia, a little swollen, 

 with microscopical hairs and with some bristles. Labium with the 

 basal part rather short, distinctly shorter than the oval labella. Thorax 

 a little rectangular or aimost quadrate; scutellum black or æneous, 

 marginate and with the margin serrulated or crenelated; it has no 

 marginal fringe below, No thoracai or scutellar bristles. Metapleura 

 with dense, somewhat short hairs. Abdomen somewhat narrow and 

 elongated, as broad as or a little narrower than thorax, with parallel 

 sides; in the male there are four not transformed segments of which 

 the fourth is the longest; the fourth ventral segment is much shorter 

 than the dorsal, incised in the hind margin in various ways, either 

 with a broad, not deep incision or with a narrower but deeper in- 

 cision, and further the incision may have teeth at the margin. Genitalia 

 relatively large; the fourth dorsal segment is bent down over the 

 genitalia at the sides and apical corners; in the female there are five 

 normal segments, the fifth quite small, the rest are hidden, the last 

 terminates with two small lamellæ. Legs generally somewhat robust, 

 hind femora more or less thickened and arm ed below with spines, 

 especially on the apical part; the hind tibiæ more or less thickened 

 and hind metatarsi likewise more or less thickened, sometimes strongly 

 (in non-Danish species). The legs have shorter or longer hairs but 

 they are generally somewhat short; sometimes (in non-Danish species) 

 the hind leg? and tarsi specially haired. Glaws and pulvilli of medium 

 size; empodiam small, spine-shaped, hairy. Wings with the cubital 



