1383.: ^ 215 



dinal, black bands, and has light grey sides. Zetterstedt says that the alulets are 

 " sordide alhidcz" but I have found both these and the halteres to be usually of an 

 orange colour. 



This is rather a local species. I have found it abundantly in a plantation near 

 Bradford, and have received specimens from Mr. Inchbald, which he had bred from 

 the leaves of Rumex acetosa, which are mined, or, rather, blotched, by the larvae. 



P. PUDicA, Eond. 



This is a pretty, bright-looking fly, about the same size as the last (6 mm. long), 

 but having the abdomen rather more elongated and pointed. The thorax is of a 

 glistening whitish-grey colour, lighter on the front margin and on the shoulders ; it 

 is marked by a central black stripe, which only extends along the anterior half, and 

 by two very wide lateral bands, which reach the bases of the wings. The abdomen 

 is of a slight pinkish-grey colour (sometimes glaucous), with a slender, continuous, 

 tapering, longitudinal, black stripe. 



The sub-anal male appendages are small. The hind tibiae are armed with a few 

 bristles towards the upper part of their inner sides. I do not know the female. 



Not uncommon. 



P. DISSECTA, Meig. 



This rare species is characterized by having yellowish -brown wings, sub-con- 

 tiguous eyes (in the male), a nearly bare arista, a dull, dark grey thorax, with 

 cinereous shoulders, and three, rather indistinct, black stripes, an oblong, flattened, 

 rather narrow, abdomen, of a light grey colour, clothed with numerous soft hairs, 

 and marked with an interrupted dorsal black stripe, formed by four triangular spots, 

 the bases of which are dilated into transverse bands opposite the upper edge of each 

 segment. It has straight, perpendicular, external, transverse veins to the wings, and 

 the male hind tibiae are armed with a few short bristles of uneven lengths in the 

 middle of their inner sides. 



I have not seen a female. 



I captured one male at Thorparch, near York, in August, 1878, another at Silver- 

 dale, in Lancashire, in May, 1881, and a third near Bicester, Oxon, in June, 1882. 



P. INCOGNITA, Eond. 



This species, of which I have only seen one British male example, captured by 

 the late F. Walker, closely resembles P. dissecta by its brown wings and other 

 general characters, but differs by having a more pubescent arista, narrower cheeks, 

 a more nigrescent thorax, and a narrower abdomen, which is marked with much 

 larger triangular spots, which cover the greater part of the dorsum. 



I possess a typical continental male specimen which was named by the late 

 Professor Rondani. I do not know the female. 



P. LACTUc^, Bouche. 



This species is of a deep rich brownish-black colour with brown wings. The 

 eyes of the male are contiguous, with the frontal triangle red ; the arista is pubes- 

 cent : the cheeks rufous ; the thorax with a cinereous tinge on the shoulders and 

 sides ; the abdomen is oblong and flattened, of an uniform brown colour, when 



