Dolichopodidae. ^29 



either only on abdomen or also on thorax; abdomen has often yellow 

 side-spots on one or several of the basal segments. Head generally 

 broader than thorax, about as broad as high, or, especially in the 

 females, a little broader; it is semiglobular, but very short, and the 

 occiput is flat, or, in the females, slightly arched. In a few species 

 {magniconiis, elongata) the head is a little smaller, and also in the 

 males less short and a little arched behind. The vertex is consider- 

 ably excavated, the ocellar tubercle high and prominent. Frons a 

 little decreasing in breadth towards the antennæ, most in the males, 

 and in this sex narrower than in the females. In the females there 

 are strong ocellar and outer vertical bristles, and a pair of postvertical 

 bristles, but in the males there are generally no vertical bristles; I 

 have found vertical bristles in the males of only Loewii and magni- 

 cornis, and these males have the frons somewhat broad. ^ On the 

 posterior side of the ocellar tubercle there are a number, or only a 

 pair of somewhat long, forwards curved hairs, longest in the males. 

 The eyes are large, largest in the males, somewhat oval; in the living 

 specimens they are dark metallic green, with strong, purplish or red- 

 dish reflexes, or almost quite purplish ; they are densely hairy ; the 

 eye-facets are in the males slightly enlarged on the front side. The 

 eyes are separated, the epistoma more or less narrow in the males, 

 broader in the females. The postocular bristles or hairs form a single 

 row on the upper half of occiput, but the whole lower half is covered 

 with hairs, which are longer and less or not bristly; they are not 

 interrupted above the mouth aperture: also above, at the vertex, 

 there are a few bristles placed behind the row; the bristles in the 

 row on the upper half are small in the male, longer and stronger in 

 the female. Antennæ shorter or longer, longest in the male, it is 

 especially the third joint which is longer; first joint cylindrical or a 

 little obconical, second joint short, obconical, generally not or slightly 

 overlapping the third joint, but in some species {magnicornis, elongata) 

 more or less elongated above and on the inside, and overlapping the 

 third; the third joint is more or less triangalar, in the males elongated 



1) Kowarz says (Verhandl. zool. bot Gesell. Wien, XXVIII, 1878, 438) in general 

 that the males have short vertical bristles; one or several of the uppermost 

 postocular bristles are stronger than the others, and it is evidently these Kowarz 

 sometimes considers as vertical bristles, but this they cannot be, firstly because 

 they are placed more posteriorly than the verticals, and secondly because they 

 are also present in the females, which have vertical bristles; and that it is 

 so is proved beyond doubt by those males, which have real vertical bristles, 

 as these are placed much more anteriorly on a line with the ocellar bristles, 

 and these males have also stronger upper postocular bristles. 



