1. H.EMATOPOTA 337 



in 1837 considered that he could only distinguish one British species, but his description 

 shows that he (in company with Mr J, C. Dale) found //. crassicornis at Rannoch 

 in July 1825 ; he stated that his Rannoch specimens belonged to Curtis' //. hirsuta, 

 but Curtis himself subsequently declared that his //. hirsuta was only the male of 

 H. jiluvialis. 



2. H. crassicornis Wahlberg. Third antennal joint wholly black ; 

 basal joint in both sexes ovate incrassate, mainly shining. Pubescence 

 behind the vertex mainly tawny in the male. Femora of the female 

 always blackish. Wings darkly marmorate. 



Very similar to the other species, but a more blackish fly 

 with more darkly marbled wings and with the basal joint of 

 the antennae more dilated in the female and less dusted about 

 its base. 



(? . Head when seen froni in front flatter than in the other species because the 

 eyes diverge at a wider angle, and when seen from above proportionately 

 narrower and not so short as in //. italica, and when seen in profile more 

 evenly rounded above the antennae. Face with the black spots on the side- 

 cheeks coalescing into a larger blotch near the antennae ; postocular ciliation 

 long and black on the upper part but forming between the eyes at the vertex 

 a small tuft of still longer hairs which may be entirely composed of tawny hairs 

 (though not so conspicuously pale tawny as in H. italica) or may have a few 

 or even many black hairs intermixed (but never forming so conspicuous or 

 so exclusively a black tuft as in //. jduvialis) ; the slightly puffed-out 

 sides of the vertical triangle blackish grey ; upper part of the frontal 

 triangle almost equilateral, and the dust there and at the sides of the frons 

 more whitish grey than in the other species ; palpi with a more blackish tinge 

 than in //. pluvialis and with more black pubescence. Eyes with their lower 

 margin diverging more widely in front so as to make the "head appear flatter, 

 and when viewed in profile more deepened and rounded below -or less pro- 

 duced to the antennas so that they appear to be a little deeper than long ; 

 pubescence slightly darker, but much shorter than in //. italica ; facets on the 

 upper part less enlarged than in //. pluvialis and //. italica ; in life iridescent 

 brownish green on the upper half (rather less on the back part) but on the 

 lower half darker green with three brilliant bands, of which the largest 

 and most conspicuous is reddish on a vivid green ground colour and is 

 irregularly wavy all across near the middle of the eye, there being a deep 

 wave upwards near the antennal end of the band and a projection upwards 

 after its middle ; the lower band is straighter, all green, and just below the 

 large band, but extending only for about half as far and not extended at all 

 towards the back part of the eye ; the upper band is only represented by a 

 greenish spot on the hindmargin of the eye just above the middle. Antennse 

 barely one and a quarter times as long as the head ; basal joint more dilated 

 than in //. pluvialis, being onlj^ one and a half times as long as deep, shorter 

 than the third joint, and bearing no grey dust about the base except a very 

 inconspicuous amount on the inside ; second joint slightly longer than in 

 //. pluvialis, but not produced dorsally over the third joint ; third joint with 

 its basal segment thinner, being more equal in stoutness all along, and 

 with very few tiny depressed black dorsal bristles before its middle, and 

 not at all reddish ; the other cylindrical segments of the third joint are 

 nearer the same_ stoutness as the end of the basal segment and are more 

 continuous with it than in //. pluvialis and H. italica. 



Thorax deep dull black, with two widely separated conspicuously whitish 

 grey stripes which are well interrupted at the suture and which form just after 

 the suture only rather conspicuous wider whitish grey spots, but there is 

 sometimes a faint narrow middle line ; a grey spot also occurs just above each 

 wing-base, and the postalar calli are occasionally dark chestnut ; pubescence 

 almost erect, brownish grey, and with very few black hairs intermixed except 



