108 AN ACCOUNT OF BRITISH FLIES. 
autumn in woods and thickets. The larve are known to congregate 
in large numbers, and may possibly abroad form the so-called “ Heer- 
wurm ” in some instances. This is the largest of the genus. It does 
not hibernate. 
S. carbonaria, Mg. 
This insect is almost black all over. The thorax is shining ; 
antennz a little longer than head and thorax ; wings hairy, shining 
brown in 4, darker inthe 2. Costa faint; second longitudinal vein 
dark brown. The abdomen of the d is longer and slenderer than in 
the 9, and the wings with shorter hairs. Legs testaceous ; tarsi 
dusky brown. 
Found in the spring and summer; rare in England, but not so 
on the Continent. Winnertz* says: “Ich habe sie Laufig auf 
Weiden bliiten augetroffen, und auch in copulo sefangen.” 
Histea forcipata, F. 
S. morto, F, = ‘s Jtorilega, Mg. 
S. lugubris, Wtz. (?) 
This species is black, shining. Wings blackish, darkest along the 
costa; halteres piceous at base, knobs black. Second longitudinal 
vein ending much beyond the fork of the fourth, and much beyond 
half the length of the wing. Abdomen in ¢ slightly hairy, in the ? with 
a yellow line on the sides when alive, this disappears at death. Legs 
piceous ; tips of femora in ¢ testaceous, dusky in the 2. 
Dalet records this from West Cornwall, and it is mentioned as 
being common in Walker. Verrall places it amongst the reputed 
species for some reason. Loew} obtained the larve from the stalks 
of Aretium.§ 
S. guinguelineata, Macq. 
This is a species mentioned by Curtis,|| and was reared from rotten 
potatoes. 
The imago is black, with shiny thorax, with five whitish lines ; 
wings nearly transparent; abdomen blackish-brown. Legs dark 
black ; ends of coxz and femora testaceous, tarsi dark. Antenne 
yellowish. 
S. precox, Mg. =. fascipes, Mg. 2. 
Black ; thorax black and somewhat shiny ; palpi black; antennz 
* Mon. der. Sciarinen, 1867, Wien., p. 14. 
+ Diptera of West Cornwall, 1890-91. 
{ Dip. Beitrage, fasc. 4th, p. 18, 1850. 
§ This is probably the same species as cardonaria. 
| Curtis, ** Farm Insects,” p. 460, 1860. 
