230 Orthorrhapha brachycera. 



triangular ; arista inserted dorsally, near the apex of the third joint ; 

 it is two-jointed with the basal joint short, and it is generally longer 

 than the antenna itself, but in some males shorter. The first antennal 

 joint has bristles above and on the outer side, the second has a 

 circlet of bristles at the apex, longest above, in elongata it has also 

 hairs on the dorsal margin ; the third joint very short-hairy, and the 

 arista short- or microscopically pubescent. The epistoma is, as men- 

 tioned, narrower in the male than in the female; clypeus generally 

 short, sometimes a little longer, it is in the males very slightly marked 

 off from the epistoma; in the females the separation is more distinct, 

 as there is at each side an elevation with a small notch, and the 

 clypeus is in this sex generally a little arched; it does not reach the 

 lower margin of the eyes. The proboscis and the mouth parts, as 

 well as the mouth aperture, are considerably larger in the female 

 than in the male, and the proboscis is not or slightly protruding in 

 the male, but somewhat protruding in the female. Labrum {diaphann 5) 

 strong, high at the base, semitubular, with a longer, less chitinised 

 median tooth, and two shorter, strongly chitinised lateral teeth, which 

 on account of the semitubular shape lie more downwards; the upper 

 or median tooth is serrated on the lower margin from a little behind 

 the apex to the lateral teeth. Hypopharynx likewise strong, a little 

 shorter than labrum, very broad at the base and somewhat suddenly 

 narrowed into an elongated triangular apex, the point is curved a 

 little downwards; the hypopharynx has the margins curved a little 

 upwards, it is thus slightly semitubular with the cavity turned towards 

 the cavity of the labrum ; it has a distinct salivary duet, widened in the 

 basal part. Maxillary palpi large, oval, squamiform and hairy; (they are 

 considerably smaller in the male). Labium short and thick, the basal 

 part shorter than broad, and shorter than the labeila; these latter are 

 broad, oval, with hairs at the margin. Thorax somewhat short, almost 

 quadratic, high, and a little arched above; pro- and metathorax small, the 

 former with a transverse row of small bristles. Acrostichal bristles biserial 

 and generally somewhat long; there are six long dorsocentral bristles, 

 a humeral bristle, and besides some hairs or (in the group Lasiargyra) 

 a whole tuft, further a posthumeral, a præsutural, three supraalar, 

 a postalar and two notopleural bristles; the front part of the disc 

 has as usual smaller hairs, but in some of the species with a hairy 

 scutellum {Lasiargyra Mik) the whole thoracic disc is clothed with 

 somewhat long hairs, shorter in the females, and in this case the 

 acrostichal hairs may in the male appear somewhat irregularly placed. 

 Propleura with more or fewer hairs, some of which may be strong 

 prothoracic bristles. The prothoracic spiracle distinctly hairy at the 



