1SS3.: 215 



dinal, black bands, and has light grey sides. Zetterstcdt says that the alulets arc 

 "sonlide albidce," but I have found both these and the haltcres to be usually of an 

 orange colour. 



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

 Bradford, and liave received specimens from Mi*. Inchbald, wliich ho had bred from 

 the leaves of litoriej; aceiosa, which arc mined, or, rather, blotched, by the larva;. 



P. PUDicA, ]{ond. 



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 vrhitish-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 tibia; 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 tibise 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 Thorpareh, near York, in August, 1878, apother 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 difPers 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. LACTUCV^, Bouchc. 



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 checks rufous ; the thorax with a cinereous tinge on the shoulders and 

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



