176 AN ACCOUNT OF BRITISH FLIES. 
shaped bunch of hairs. The body is composed of eight segments. 
The pupz are often bent (Zanyfus) like those of Culex. Two 
curious respiratory appendages are also present on the back of the 
pupz of this genus; it appears that these two external pupal 
appendages arise from the two internal ones seen in the larve. The 
pupze are always active creatures, even the terrestrial ones moving 
about violently if disturbed. 
GENuS.— Corynoneura, Wtz. = Chironomus, Mg., Zett. 
The members of this genus are very minute, the largest European 
species being only ;°; of a line long, and with alar expansion often 
not more than 4 lin. The body is elongated and head nearly round ; 
the proboscis is very short; the palpi, which are 4-jointed, are 
curved downwards, the fourth joint being nearly as long as the other 
three. The antenne are filiform, and arise from a thickened basal 
joint, the last joint is usually larger than the intermediate ones ; 
1o-jointed in ¢, 6-jointed in 2 ; the hairs on the ¢ antenna long, 
with a bunch of star-like hairs on the distal joint. Scutellum is 
small. Metathorax elevated. Wings bare; costa clavate and very 
short. Abdomen composed of eight segments. Hind tibiz have a 
long spur on the upper side and two spines beneath. Plate iv., fig. r. 
They may be found in abundance near water, and have a curious 
habit of running about on stones, etc., in circles and curves with 
astonishing rapidity. I have noticed them to be more abundant 
near rapid and rocky streams, such as we find in mountainous 
tracts. 
e minuta, Wtz.=C. minutissima, Mg., C. celeripes, Wtz. 
This is a common species around lakes, and especially along the 
banks of rapid streams. It appears about May, and lasts on until 
the autumn. The head and thorax are black in the g. Proboscis, 
palpi and antennze are whitish, the basal joints of antennz brown. 
The abdomen is greenish-white, the last segments (1-3) brown. 
Legs brown, femora white, with dusky tips. In the 9 the head is 
also black, but the thorax is yellow; the mesonotum has three 
broad black stripes, almost covering the whole thorax. Scutellum 
black, and also the metanotum, The pectus is dark brown. Abdo- 
men black, with pale bands, pale brown on the ventral surface. 
Legs lighter than in ¢; the wings are white, not yellow, as in the 
d. Length, ;%; lin. Taken in Wales, Devonshire and Monmouth- 
shire. 
