Dolichopodidae. 59 



arista is long, and dilated at the tip. Epistoma more or less narrow 

 in tlie male and always broader in tiie female, though it also in this 

 sex may vary a little in breadtii in tlie various species. Glypeus 

 short, it is only slightly marked ojEf from the epistoma by a small 

 elevation at each side with a little notch; it is generally a little 

 arched, especially in the female, while the epistoma is flat; the 

 clypeus is also generally bent a little inwards, so that a small angle 

 is formed between epistoma and clypeus; it does not reach to the 

 bottom of the eyes, though in some species it may go far down, al- 

 most to the lower margin of the eyes (e. g. plumipes). The proboscis 

 very slightly protruding, it is considerably thicker and the mouth 

 parts are larger in the female than in the male, according to the 

 breadth of the epistoma, and likewise the oral aperture is larger in 

 the female, and reaching higher up on the back of the head. Labrum 

 (Z>. ungulatus $) short and broad, it has a longer median tooth, the 

 end of which is curved hook-formed downwards, and a shorter, broad, 

 triangular tooth on each side; backwards or upwards the labrum is 

 prolonged into a strong process, bringing it in connection with clypeus. 

 Hypopharynx slightly longer than labrum, broad at the base and 

 triangularly attenuated and pointed; it has a very distinct salivary 

 duet, which is widened in the broad basal part, The maxillary palpi 

 are oval, squamiform, hairy and with stronger bristles at the apex. 

 The basal part of labium is a little longer than the labella, which are 

 broad and bear hairs and bristles. Thorax rectangular, somewhat 

 high and somewhat arched above; prothorax small, it has a trans- 

 verse row of small bristles above; metathorax likewise small and 

 forming a narrow rim above, but there is no chitinised metasternum. 

 The acrostichal bristles are biserial and distinct; there are six long 

 dorsocentral bristles, longest behind; further a humeral bristle, and 

 generally one weaker, two posthumeral, of which the inner is gener- 

 ally weaker than the other, but sometimes of the same size, two 

 notopleural bristles, a præsutural, placed far forwards, three supra- 

 alar and a postalar bristle; the front part of the disc has small hairs. 

 The propleura have fine hairs and one prothoracic bristle. Scutellum 

 with two marginal bristles, and on each side a small hair; besides 

 it is more or less pubescent, especially at the margin. Abdomen 

 slightly compressed, narrowed behind and thus somewhat conical; 

 the first dorsal segment is shorter than the following; the second 

 ventral segment is roundly inclsed anteriorly, and in front of it lies 

 an exceedingly narrow chitinisation, representing the first ventral 

 segment; the space between the latter and the hind coxæ mem- 

 branous. In the male the second to fifth dorsal segments are of about 



