1875. . 223 



The males of these pretty little flies are usually fouud iu greater 

 abundance than the females, but I have frequently caught the latter 

 upon the dropi)ing8 of horses and cows in the roads and fields. They 

 doubtless deposit their eggs in the dung. 



Anthomtia. — The restricted genus Antlwmyia contains the last 

 batch of species in the division, having the scales of the alulets of 

 unequal size. The flies comprised in it have a bare, or nearly bare, 

 arista, and differ from those in the two preceding genera by having 

 the head more or less angular ; the face and epistome often projecting 

 considerably. They also have the anal vein prolonged to the margin 

 of the wing. The shape, as well as the colour and markings of the 

 abdomen, vary greatly, and the genus is not upon the whole a natural 

 one, but requires subdivision. The typical species of this genus are 

 A. pluvialis and A. radicum. 



In the last three genera, the species, with a few exceptions, have 

 five dorsal bristles upon the thorax, two in front and three behind the 

 suture. 



Htlemyia. — This genus so closely resembles Hj/droplwria, chiefly 

 differing by the smaller and equal size of the scales of the alulets, 

 that the two have been included in one by Schiner and others. 



The abdomen is oblong or rather cylindrical, and generally fur- 

 nished with subanal appendages. The dorsal bristles are five in 

 number, but, as in Hydrophoria, a sixth smaller one is often placed 

 behind the others. This genus includes a large number of species. 



Choetophila.' — This is also a large genus. Many of the species 

 resemble, in general appearance, those of Hylonyia, having C5dindrical 

 bodies and subanal appendages, but differ by the arista being bare ; 

 others are closely allied to the AntliomyicE, but have the scales of the 

 alulets of equal, instead of unequal, size. Many of the species in 

 both these last genera are small and difficult to name, the descriptions 

 of authors not being sufficiently precise, or not based upon character- 

 istic points of structure. 



Eetphia. — I have included this genus in the British list, but I 

 have not yet seen a specimen of the single Alpine species which it 

 contains. 



LisPA. — In this and the succeeding genera the eyes are widely 

 separated in both sexes. The species contained in the present one 

 may at once be recognised by the form of the palpi, the extremities of 

 which are dilated into flattened knobs. They are not common. 



