Empididae. 9 



inserted quite near to each other in the middle of the head. Epistoma 

 is small and narrow, and there are no jowls developed, the eyes 

 reaching quite to the mouth aperture. The antennæ are three-jointed,. 

 the two first joints are small and the basal one often difficult to see; 



Fig. 1 , Antenna of H. fenioratus. X 60. 



it is short, cylindrical and not longer than broad; the seeond joint 

 is globular; the third is longer, oval and somewhat compressed, and 

 it has at the apex a long arista which, so far as I have been able 

 to see, is not articulated to the joint. The seeond joint bears bristles. 

 The oral cone is relatively small; clypeus consists of two chitinous 

 lists connected above, stretching about from the epistoma to the base 

 of the labrum. The proboscis is rather short, of the length of or 

 slightly longer than the head is high; it is directed horizontally for- 

 wards; labrum is almost of the same length as the proboscis, slender 

 and pointed, a little higher at its insertion ; hypopharynx is a pointed 

 blade of about the same length as labrum. Labium is well chitinized, 

 but membranous along the middle line; the labella are small and 

 short, divided in their whole length. I could detect no maxillæ, but 

 there are long, one-jointed maxillary palpi, beset with some long hairs 

 on their lower side. Thorax is somewhat rectangular, very high and 

 strongly arched above ; it has a flat, declining part behind ; prothorax 

 is developed and neck-shaped, but small, with some hairs above; 

 metathorax is exceedingly small, and there seems to be no metasternum 

 developed. The thoracic disc has rows of hairs, forming more or less 

 distinct dorsocentral and acrostichal rows, and there are notopleural and 

 postalar bristles and two stronger and some small scutellar marginal 

 bristles. The notopleural bristles (generally two stronger and some- 

 times a third weaker) are placed on a somewhat extended, flattened 

 part which certainly corresponds to the præsutural depression. Besides 

 there are other small hairs on the humeri and the sides of the disc. 

 Metapleura without hairs. Abdomen is somewhat slender, more or 

 less cylindrical in section, but with the venter flat; it is generally 

 borne a little curved. It consists of eight segments; the first dorsal 

 segment is short and a little broader than the following, the seeond 

 is the longest; the first ventral segment is on the contrary of the 

 same length as the seeond. In the male the eighth segment is very 

 small and often more or less hidden; it is somewhat unsymmetricaL 



