340 Orthorrhapha brachycera. 



eyes are metallic green, generally with a red part above; they are 

 densely hairy. The facets are of the same or almost the same size. 

 The eyes are well separated in both sexes, the epistoma being of the 

 same breadth or slightly broader in the female. Jowls absent or 

 present, when present narrow or broader. The postocular bristles 

 form a single row, but are only present on the upper half, the lower 

 half of occiput is densely covered with somewhat long hairs, and 

 there are also hairs above the mouth aperture. Antennæ situated 

 near to each other, somewhat high above the middle; they are short, 

 not as long as the head, of the same length in the tvvo sexes; the 

 first joint somewhat obconical, the second short and simple, the third 

 short, roundish or almost so, and rounded or a little pointed at the 

 end; it has a little exeision or notch in the lower margin behind the 

 tip, so that a little, triangular point is formed; the arista is dorsal, 

 somewhat thick, as long as or somewhat longer than the antennæ; 

 its first joint is shorter or longer but always somewhat long; the 

 arista terminates in a long, hair-like part. The first antennal joint 

 is bare, the second has bristles at the apex, the third joint and the 

 arista are short- almost microscopically hairy. Epistoma a little nar- 

 rowed above, sometimes more in the male than in the female; it is 

 plane or a little concave ; below it has a small tubercular prominence 

 at each side at the eye margin, separating it from the clypeus; this 

 latter is a little arched with a rounded lower margin; it reaches 

 either to the lower margin of the eyes or is a little shorter. The 

 proboscis is short, almost not protruding, it and the oral aperture are 

 of the same or almost the same size in both sexes; labrum (balticus) 

 is of a curious structure, it is short, with a not or slightly chitinised 

 middle process, and with two relatively long and pointed lateral 

 teeth, reaching fully as long forwards as the median process; from 

 the basal part of labrum a strong process goes backwards; hypo- 

 pharynx of the usual shape, pointed triangular, curved a little down- 

 wards; the maxillary palpi oval, squamiform, hairy. Labium with 

 the basal part longer than the labella, it is cleft behind into tvvo pro- 

 cesses; the labella are broad, oval, when spread out forming a cir- 

 cular disc. As in Medeterus the mouth parts have very strong 

 muscles. Thorax rectangular, somewhat long, it is high, and some- 

 what arched above ; behind, in front of the scutellum there is a small, 

 flat, somewhat indistinct, declining space ; the side parts of the trans- 

 verse furrow lie somewhat backwards, about in the middle. Pro- 

 and metathorax small, the former with a row of small hairs above; 

 metaepimera rather broad. Acrostichal bristles small, uniserial ; the 

 dorsocentral bristles are shorter or longer, generally somewhat numer- 



