508 Syrphidae. 



arista microscopically hairy, the latter bare on the apical half. Epistonia 

 rather low, it is more or less but not much hoUowed; there is no 

 central knob and the front mouth edge is only slightly or a little 

 more protruding, and epistoma is not descending; it is black but pale 

 pruinose with only the lower side parts bare; sometimes it is only 

 slightly pruinose; it is bare with only slight hairs at the eye-niargins. 

 Jowls small, not or almost not descending; there is a furrow separating 

 off narrow eye-margins and stretching up above the middle. Proboscis 

 and oral cone short ; the mouth parts short but strong and somewhat 

 characteristic. Glypeus with the basal part large, the side legs rather 

 short. Labrum {segnis) short and strong, strongly semitubular, the 

 median process somewhat broad, cleft, beset with emergences on the 

 apical part; the upper lateral processes fine, not attenuated and pointed 

 but truncate at the end; the lower lateral processes very broad and 

 with the end broadly cut, not attenuated; the usual lateral rows of 

 small papillæ on the inside present and the papillæ numerous; hypo- 

 pharynx a little shorter than labrum, broad and semitubular, some- 

 what abruptly attenuated and with the apex pointed ; the salivary duet 

 distinct; maxillæ short, a little shorter than hypopharynx, rather broad 

 and strong, as usual with very small, microscopical spines in rows; 

 palpi quite small and short, shorter than the lacinia, with microscopical 

 hairs, and with some bristles, especially at the apex. Labium short, 

 the basal part shorter than the relatively large and broad labella. 

 Thorax rectangular; scutellum black or æneous, somewhat marginale, 

 with a marginal fringe below, There are no thoracai or scutellar 

 bristles, only the marginal hairs on scutellum may sometimes be strong 

 and somewhat bristly, and above the wing-root are short but very 

 strong, dense hairs. Metapleura with short, dense hairs. The meta- 

 epimera send a process upwards, below the balteres, these processes 

 stand out at each side of the base of abdomen as in Neoascia but 

 are less pointed. Abdomen is relatively long and narrow, parallel- 

 sided and generally somewhat flattened; in the male there are four 

 not transformed segments, the first somewhat short, the others of 

 about equal length; sometimes (femorata) ihe fourth is unusually long, 

 much longer than the others. Genitalia large, of usual shape. In the 

 female the abdomen has five normal segments, the fifth small and 

 pointed, the last terminating with two small lamellæ. Legs somewhat 

 long, hind femora more or less thickened, especially in the male, and 

 armed below with shorter or longer spines, either in the whole length 

 or only on the apical part; the spines are generally also longest in 

 the male; hind tibiæ more or less compressed and curved; in the male 

 the hind trochanters have in many species a shorter or longer spine 



