542 Syrphidae. 



Frons somewhat prominent, hairy. Antennæ inserted above the middle 

 of the head; they are not small, thh'd joint nearly roundish ; the basal 

 joints have small hairs, the second small bristles at the apex above 

 and below, the third and the arista microscopically hairy. Epistonia 

 hollowed below the antennæ, with a moderate central knob and below 

 it retreating; it is somewhat protruding and slightly deseending; epi- 

 stoma is yellow, nearly bare, with hairs only below on the sides. 

 Jowls small, almost not deseending; in front they are somewhat 

 separated from epistoma by a furrow which stretches upwards towards 

 the antennæ and thus separates ofif distinct eye-margins, almost as in 

 Chilosia\ the eye-margins are hairy. Oral cone and proboscis of 

 moderate length; clypeus with the basal part not long. Labrum 

 (cuprea) of usual shape, semitubular; the processes of equal length, 

 the median not broad, cleft to the base, each part pointed and with 

 some emergences at the apex; the upper lateral processes as broad 

 as each part of the median, curved slightly inwards, knife-shaped and 

 pointed; the lower lateral processes broad, of quite the usual shape; 

 the lateral rows of small papillæ on the inside present as usual and 

 the papillæ scattered over the whole lower lateral process; hypo- 

 pharynx a little shorter than labrum, parallel-sided but with the apical 

 part attenuated, the apex itself is rounded; the maxillæ somewhat 

 short, considerably shorter than hypopharynx, rather curved, knife- 

 shaped and pointed; they have the microscopical spines arranged in 

 rows rather distinct; palpi long, much longer than the laciniæ, a little 

 clubbed, with microscopical hairs and with bristles in the whole length. 

 Labium with the basal part a little shorter than the somewhat large, 

 nearly oval labella. Thorax rectangular ; scutellum yellow, translucent, 

 with a short marginal fringe below ; thorax has long and strong bristles 

 which are one or two posthumeral, two notopleural, about four supra- 

 alar and four postalar bristles, and further a transverse row in front 

 of scutellum; scutellum has eight to ten strong marginal bristles. 

 Mesopleura have three bristles above; metapleura with dense, short, 

 towards the hind margin longer hairs. Abdomen of a shape as in 

 Chilosia; in the male there are four not transformed segments, the 

 three last of about equal length. Genitalia not large. In the female 

 abdomen has five visible segments, the foUowing hidden, the last endin>,' 

 with two short lamellæ. Legs simple and haired in the usual way, 

 but with some few bristles at the apex of middle femora and on tibiæ; 

 anterior trochanters with a solitary bristle above. Claws and pulvilli 

 well developed; empodium spine-shaped, hairy. Wings with the cubital 

 vein curved very slightly downwards above the first posterior cell; 

 medial cross-vein somewhat oblique, placed at the middle of the discai 



