138 AN ACCOUNT OF BRITISH FLIES. 
brown ; the thorax shiny and covered with pale hairs. "The abdomen 
brownish. Palpi brownish ; antennz dark brown, first and second 
joints yellowish. Legs short, yellowish ; posterior tibiae have short, 
but distinct spines. Wings hyaline; veins stout and brown ; areolet 
small; first longitudinal vein connected with second before the 
areolet ; fork of fourth longitudinal vein with very short petiole. 
Length 24 lin. This species may be known from Z. rufum by being 
shorter in legs and antenne and by the stout veins. 
Platyura, ¥. 
GENuS Sciophila, Mg. = { Asindulum. Lat 
In this genus ¢he costal vein extends to the tip of the wing. The 
body is slender and elongated. Head small. Proboscis short. Palpi 
four-jointed, fourth joint long and slender, first and second joints 
short. Antennz 16-jointed, as long in 92, longer in @, than head 
and thorax. Eyes oblong; ocelli three in number. ‘Thorax short, 
with black hairs. Abdomen slender, seven segments, cylindrical in 
6, fusiform in 2. Legs long and slender; femora hairy, tibiz 
setose ; spurs moderately long. Wings moderately broad, minutely 
hairy ; first longitudinal vein slightly curved towards its tip, often 
united with costal, and connected with second longitudinal near 
its tip by a transverse veinlet ; third longitudinal arises from the 
second before the middle of the wing ; fourth longitudinal forked at 
beyond the middle of wing; fifth forked, forks nearly straight ; 
seventh very near the base. Areolets twelve, including two 
cubitals. 
S. tenuis, Wik. 
This gnat is slender and tawny. Head tawny, vertex black. Palpi 
and proboscis yellowish ; antennz dark brown, yellowish at the base. 
Thorax has three dark stripes, the middle one long, the lateral ones 
short. Abdomentawny. Legs yellowish, long and slender ; posterior 
tibize with minute spines and very short spurs. Wings nearly limpid ; 
transverse veinlet springs from the first longitudinal vein opposite 
the middle of the first cubital areolet. Length 24 lin. Appears to 
be uncommon ; found in August. 
S. fasciata, Zett. 
Yellowish ; head with vertex black ; antennz dark, yellowish at 
the base. Three black stripes on the thorax, lateral stripes short. 
Abdomen black, with a yellowish border on the posterior edge of 
each segment. Legs yellowish; tarsi brown; posterior tibiz with 
