20 4i [February, 



The tubercle resembles that of H. scalaris in being smooth, but is proportionately 

 smaller and less prominent. 



I captured a single male of this rare species at Tingcwick, near Buckingham, in 

 August, 1873. 



H. heeniosa, Rond. 



This differs from all -the other species in the genus by the males having a large 

 projecting sub-anal process. The abdomen is black with grey reflections, but without 

 any distinct dorsal stripe. The wings are slightly fuscous, and have the anal veins 

 rather more elongated than usual, with the axillary veins straighter and placed 

 almost parallel with the anal. It is rather an aberrant species, and appears to be 

 rare ; I have only seen three specimens, all captured in the neighbourhood of 

 Bradford. 



H. MUTICA, Zett. 



This species is probably the same as the H. lepida of Wiedemann and others 

 (not of Zetterstedt), and the H. prostata of Rossi and Rondani ; but the descriptions 

 given of these species are not sufficiently precise to enable one to determine the point 

 with accuracy, and it is very likely that more than one distinct species have been 

 mixed together under the name of H. lepida. For these reasons I have adopted the 

 title of mutica, as the description given of that species by Zetterstedt agrees with the 

 characters of the fly which I wish to discriminate. It is from 2 to 2h lines in 

 length ; the calyptra have the scales of moderate size, and of marked inequality ; 

 the thorax is black ; the abdomen grey, with brownish-black reflections, and the 

 usual angulated black dorsal stripe ; the intermediate tibise are gradually (not 

 abruptly, as in H. armata) thickened towards their extremities, and ciliated with 

 very short hairs on the inner sides of the thickened parts ; the posterior tibia? are 

 slightly curved inwards, ciliated along the whole of their external surfaces with a 

 row of hairs of moderate and even lengths ; and have on their inner sides some long 

 hairs in the middle, and others which become shorter towards each extremity ; the 

 wings are slightly fuscous. It is not uncommon. 



H. SOCIELLA, Zett. 



This is a well-marked species, of about the same size as the last. The thorax 

 has a grey tinge, the shoulders being whitish ; the abdomen is ash-grey, marked by 

 a narrow black sub-interrupted dorsal stripe, with very indistinct or no angular dila- 

 tations ; the intermediate legs have the femora ciliated with long hairs of even 

 lengths along their posterior surfaces, and are furnished with a long row of spines 

 on their under sides ; the middle tibiae have yellow bases, are very slightly thickened 

 towards their extremities, and ciliated with soft short hairs along the whole length 

 of their inner surfaces j the posterior tibia? are simple, having no bristles or long 

 hairs on their sides, with the exception of the two or three usual spines on their 

 outer surfaces. A rare species. I only possess a single male, captured near 

 Bicester, Oxon. 



H. SERENA, Fall. 



This is a small species, only from 1£ to 2 lines in length; the calyptra are 

 small, with scales almost equal in size ; the wings have a brownish tinge ; the abdo- 

 men is narrow, and often with a reddish or yellowish tinge, and somewhat translucent 



