490 Syrphidae. 



36. Cpiorrliina Meig. 



Species of large or medium size and densely pilose, at at! events 

 on tliorax; they are somewhat varying in shape, broad or narrower. 

 Head very short, broader than high, about of the breadth of thorax 

 or a little broader; it is flat or a little arched behind, only sligthly 

 Gxcavated above. Eyes bare; in the male they are approximated 

 above in a point but not touching, and the vertex is relatively long 

 and narrow; they are separated in the female but not very broadly; 

 in the male the facets are slightly enlarged above on the front part. 

 The frons is slightly hairy or quite bare. Antennæ inserted above the 

 middle of the head, the basal joints not quite short, the third large, 

 higher than long; arista long, inserted near the base or at some 

 distance from it; the basal antennal joints have small hairs, the third 

 joint and the arista microscopically hairy. Epistoma hoUowed below^ 

 the antennæ and then produced to a not small but little prominent 

 central knob, below which it is not retreating but almost straight to 

 the mouth edge; the central knob and the lower part of epistoma is 

 thus somewhat protruding, and it is considerably or much descending; 

 the epistoma is black but pale pruinose on the whole front side, or 

 sometimes with a bare, black middle stripe in the female; it is only 

 sligthly haired at the sides and on the eye-margins, sometimes also 

 on the black lower side parts. The jowls are somewhat small and 

 slightly descending, they are more or less separated from epistoma by 

 a furrow which separates off narrow eye-margins, stretching more or 

 less upwards, sometimes to above the middle. Proboscis and oral 

 cone of some length; clypeus of usual shape, with the basal part 

 somewhat long; the mouth parts otherwise mainly of the usual con- 

 struction; labrum {berberina) strong and strongly semitubular, the 

 median process the shortest, cleft and beset with- emergences; the 

 upper lateral processes thin, somewhat branched or beset with some 

 emergences; the lower lateral processes of usual shape but the inner 

 margin a little dentate with rounded teeth, and at the apex they are 

 variously excised or dentate; the usual rows of small papillæ on the 

 inside of the lateral margins of labrum are present; hypopharynx like- 

 wise strong and also semitubular, it is a little shorter than labrum, 

 parallel-sided but attenuating in the outer part, the apex rounded; 

 the salivary duet very distinct; the maxillæ considerably shorter than 

 hypopharynx, of the usual, knife-like shape and with microscopical 

 spines, especially distinct at the apex; the palpi long, double as long 

 as the lacinia, somewhat club-shaped, with microscopical hairs and 

 with numerous bristles; labium with the basal part firmly chitinised, 

 slightly longer than the somewhat broad, triangularlv oval labella. 



