0) Orthorrhapha brachycera. 



part of occiput is more or less densely covered with longish hairs. 

 The eyes are large, generally inore or less oval, but as a rule some- 

 what narrowed downwards. In the living specimens they are metallic 

 green, more or less with reddish or purplish reflexes, especially at 

 the upper corner, and sometimes almost quite purplish; in a few 

 cases they are banded. They are in most cases densely but generally 

 short-haired, sometimes nearly microscopically haired, rarely {Medeterus) 

 bare. The facets are either of equal size, or a little or somewhat 

 enlarged on the front side towards the epistoma, in both sexes or 

 only in the male. In the males of Diapliorus they are enlarged above, 

 and in this genus sometimes in the whole upper part, and this part 

 may be marked off by a dividing line. With the exception of species 

 of Diapliorus the eyes are always separated on the frons; below the 

 antennæ the eyes are generally also separated, either narrowly, or 

 more or less broadly, and most often more broadly in the females 

 than in the males ; in the latter sex they are sometimes very narrowly 

 separated, or really touching; the epistoma in the various genera may 

 either be of equal breadth, or it is narrowed towards above, or on 

 the contrary narrow below. The antennæ are inserted near to each 

 other, in or generally more or less above the middle, sometimes 

 rather high ; only in the males of Diapliorus they are placed below 

 the middle. They are five-jointed, and generally not long (the three 

 basal joints), from shorter than the head to somewhat more than 

 twice as long; they are very often longer in the male than in the 

 female. The first joint is more or less short, sometimes somewhat 

 elongated, generally obconical, and sometimes with the inner lower 

 corner somewhat drawn out; the second joint is short, hkewise gener- 

 ally obconical; it is either of simple shape, or the apical margin is 

 often peculiarly formed; it is then prolonged triangularly, or, when 

 much prolonged, more thumb-like, in the middle on the inner side, 

 and at the same time also somewhat prolonged above on the outer 

 side; this peculiar construction reaches its highest degree in Si/ntormon, 

 but here the prolongation is often only present on the inner side; 

 (in an American genus, Farasyntormon, the construction is similar). 

 The second joint is somewhat compressed. The third joint is always 

 compressed, most towards the apex; it is shorter or longer, and 

 rather varied in shape, triangular, reniform, roundish, ovate, or longer 

 and lancet-shaped or almost band-shaped, and it is especially this 

 joint, which is of various length and variously shaped in the two 

 sexes. When the second joint has the peculiar shape rnentioned 

 above, the third joint is constructed in accordance herewith; it is 

 then somewhat incised at the base, or has incisions on the sides for 



