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142 AN ACCOUNT OF BRITISH FLIES. 
beicertey WIk. 
W; eat __ | servula, Wik. 
Sr PUTSS ESB ao Se ei aie (Ne ee 
| conctsa, WIk. 
P. marginata, Mg. 
This is a black shining species. Proboscis and palpi tawny. 
Antenne a little longer than the thorax. Abdomen long and black, 
with ferruginous markings in the 2. Legs testaceous; tibiz tawny, 
tarsi brown. Wings yellowish-gray, clouded with gray towards the 
tips and along the hind border, and with a slight brownish spot at the 
base of the fourth longitudinal vein; in the 9? the discal brownish 
spot almost obsolete. Length 3} to 5 lin. Not common; found in 
woods, especially hazel woods. 
| ruficollis, Mg. 
£. a Z ’ Lt . = 
PRUE I, ochracea, Mg. 
This is a tawny species, with short and slender brown antennz, 
tawny at the base, as long as the thorax in the 4, shorter in the ?. 
Thorax with dark longitudinal marks. Abdomen with a black band 
on the fore-border of each segment ; hypopygium brown ; lamellz 
and ovipositor yellow; hairs on the body black. Legs testaceous ; 
tarsi brown. Wings with a pale yellowish tinge, and with a grayish 
sub-apical band, which is very obscure towards the hind border. 
Length 3 to 34 lin. Common in July. 
P. concisa, Wik. 
Black. Proboscis and palpi tawny. Antenne black, tawny at the 
base. Pectus and sides of the thorax piceous. Posterior borders of 
abdominal segment testaceous. Legs yellowish; tarsi dark brown. 
Wings grayish-yellow, unspotted. Length 2 lin. This seems to 
be a rare species, described shortly by Walker. 
P. unicolor, W\k., is also black, with brownish wings, paler in the 
disc towards the base, with black veins, ferruginous at the base. 
Legs ferruginous, tarsi black. Length 3 lin. Rare. 
The other British species mentioned in the table are all, as far as 
our scanty knowledge goes, uncommon. lavipfes is, however, 
recorded as common at Glanville Wootton. This is a black 
species, witn the hind borders of the abdominal segments testaceous. 
Length 14 to 2 lin. 
Atrata is a very rare species, appearing in July and August. 
