65 lAugust, 



without costal spine ; having the external transverse vein straighter and less oblique 

 than in S. communis ; and the internal transverse placed nearer to the centre of the 

 discoidal cell. The middle femora in S. qnadnim are furnished with bristles along 

 their whole under-surface, while in S. communis a few long bristles only are found 

 near the base. This is not a common species. 



S. DEPUXCTA, Fall. 



In this species the basal (wo joints of the antennfe arc often pale ; the palpi 

 arc also generally rufous, though Rondani says they are black at the apex and red 

 internally. This species may be recognised by having only three posterior dorsal 

 thoracic bristles behind the suture, while there are four in all the other species that 

 I know in this genus, with the exception of S. 4-maculaia and S.fnscala. 



8. FLAGIPES, Eond. 

 The males of this species closely resemble those of S. dejmncla ; but dilfer in 

 being rather larger ; in having four instead of three posterior thoracic dorsal bristles ; 

 and especially by having several very long straggling hairs or bristles on the outer 

 sides of the posterior tibia; ; by the presence of which this rather rare fly may at 

 once be recognised. I have not seen a female. 



S. C'0>'^SIMILTS, Fall. 

 This species has the arista furni>hed with such short hairs, that it was placed 

 by Schiner in the genus Livinojihora ; it has, however, all the characters of a 

 Spiloyaster. 



S. ruscATA, Fall. 



This is an aberrant species, which differs from all the others in the genus by 

 having only three central triangular spots, placed longitudinally on the dorsum of 

 tlie abdomen, instead of two lateral ones on each of the middle segments, as in tlu^ 

 other species. It is rare in England. 



(To he cont inuedj . 



