99 |: Mr. KF. W. Edwards on 
justified in allocating it to Chironomus, but ia its larval and 
pupal stages the species shows a much greater relationship 
to Tanytarsus. The early stages of C. clavaticrus have, 
indeed, been described in detail by Bause (Archiv fiir 
Hydrobiol., Suppl. Bd. it. p. 73, 1913) * as those of a 
Tanytarsus, which, ou the authority of Thienemann, he calls 
“ Tanytarsus flewilis, Linné,’ though he states that the 
larve nave not yet been reared. Why Thienemann adopts 
this name, which has usually been allotted to a totally 
different species of Chironomus, is far from clear; but, since 
Bause states that Thienemann himself intends to give 
reasons for the identification in a later publication, I refrain 
from comment at present. 
To the accounts given by Réaumur, Lauterborn, and 
Bause of the early stages of this species I can add the 
following points :—The egg-mass is about 6 mm. in length, 
1mm. broad, pointed at each end ; those I observed adhered 
by one end to water-weeds, but whether this was accideutal 
or whether they were fixed in this position by the fly I could 
not determine. The eggs in the egg-mass ‘are arranged in 
a rather indefinite spiral; counts of the number in two 
separate masses showed 182 and 163 respectively. The 
larve emerge from the egg through a longitudinal fissure, 
and when newly hatched are about 0°6 mm. long and practi- 
cally colourless, there being only small patches of yellowish- 
green granules at the sides of abdominal segments 2-7 and 
along the sides of the intestine; they have no trace of 
ventral blood-gills or of the hump on tie eighth abdominal 
segment ; ‘ Lauterborn’s organs” are present at the apices 
of the second and third antennal joints, as im the full-grown 
larva. The second stage larva much resembles the first T, 
but is a little over ] mm. long, and has a slight hump on 
the eighth abdominal segment and a slight red tinge behind 
the head and in the middle of the body. In the third stage 
the red cclour of the body is more widely spread, but not 
strong; the hump on the eighth abdominal segment is well 
developed, and blood-gills are present on the seventh segment, 
but are as yet colouriess and have not their full length, The 
* The early stages of C. clavaticrus apparently agree in every respect 
with Bause’s description and figures of T. fleviles, but there is, of ccurse, 
a possibility that there may be two closely allied species. 
+ Miall and Hammond state (‘ Harlequin-fly,’ p. 176) that the pecu- 
liarities of the newly-hatched larva disappear after the first moult. It is 
just possible that what I regarded as second-stage larvie are merely first- 
stave individuals which have grown in size. 
