268 [May, 



surface, in addition to the apical ones ; hind tibiae with a few short bristles on their 

 inner surfaces, and five or six longer ones, of even lengths, arranged along the outer 

 sides, at nearly equal distances from each other. I do not know the female. 



Length of male, 6 mm (about 3 lin.). 

 This species seems local. I captured a number of specimens near Risborough, 

 in Buckinghamshire, in June, 3879, but have not met with it in any other locality. 



H. NIGRESCENS, Eoild. 

 This species closely resembles the last, and may easily be confused with it ; it 

 is, however, distinct, and may be known from H. cardui by the following points of 

 difference : the eyes of the male are contiguous, the epistome slightly prominent, 

 the arista has rather shorter hairs, and has a slightly prolonged thickening at the 

 base instead of a bead-like prominence, as in H. cardui ; the thorax is indistinctly 

 striped and less white on the sides than in H. cardui; the third and fourth longi- 

 tudinal veins of the wings are slightly divergent ; the fore tibiae are without any 

 spines on their outer surfaces, besides the apical one ; the hind tibiae are more spinous 

 externally than in H. cardui, and the spines are placed in irregular order. The 

 female is unknown. Rare. I have two males captured in the neighbourhood of 

 Bradford, and have received typical specimens from the continent. 



H. PU LETT LA, Zett. 

 This little species may be known from all the others in the genus by the trans- 

 verse veins of the wings being slightly clouded with black. Not uncommon. 



H. cineeeeea, Meig. 



This species is quite distinct from the 31. cinerella of Fallen, with which Meigen 

 confounded it ; the latter species has the arista nearly bare, and belongs to the genus 

 Chortophila. The present insect has the arista distinctly plumose, though rather 

 short-haired ; the face is somewhat prominent ; the eyes of the male sub-contiguous ; 

 the dorsum of the thorax blackish-brown, with an indistinct central stripe, and an 

 irregular black line on each side, below which the sides are of a grey-white colour ; 

 the scutellum is pale grey ; the abdomen is long, narrow, and conical, grey, with a 

 narrow longitudinal dorsal stripe ; the hind legs are long, with the tibiae spinous ; a 

 few short spines being situated on their inner sides in the middle. Rare. I have 

 three males which were found near Bradford, and I have also received it from 

 Austria. 



H. cijsterosa, Zett. 



This, though supposed by Zetterstedt to be the same as the A. cinerella of 

 Meigen, is quite distinct. The face is less prominent ; the thorax (with the scu- 

 tellum) is of an uniform greyish-brown colour ; the sides are pale, but are not sepa- 

 rated from the dorsum, as in the former species, by a black line ; the abdomen is 

 oblong and flattened, of a dark grey colour, and marked on the dorsum with four 

 wide sub-confluent triangular black spots, instead of with a straight narrow line ; 

 the hind legs are proportionately shorter than in II. cinerella, and the hind tibiae 

 are clothed on their inner sides with soft hairs instead of bristles ; the wings are 

 tinged with yellow in both species. Not common. I captured five males near Lake 

 Windermere in June, 1871. 



