A New Yorkshire Gall-Midge. 335 
had the good fortune to examine are the only ones that have 
been seen in really perfect condition. 
The full-grown larva (fig. 6) is 3.5 millimetres in length, of 
a creamy colour with yellowish-brown stomach. It is of the 
usual elongated ovate shape, pointed at the anterior extremity, 
with a very distinct reddish-brown ‘anchor-process’ (fig. 7). 
On the segment behind that bearing the anchor-process is a 
tiny chitinous plate of the same reddish-brown colour, and of 
an irregularly triangular shape. This structure, on the 4th 
segment, is said by Rubsaamen to distinguish this species 
from all other known Cecidomyiidae. He also describes it as 
lying beneath the skin and of a lighter colour than the anchor- 
process, but I am unable to confirm either of these points. 
The colour of this small plate appears to me quite as dark as 
that of the anchor-process. The shape of the latter is shown 
in figure 7, which I venture to think is a more accurate repre- 
sentation than the drawing by Rubsaamen. The tip of the 
process is decidedly darker in tint than the rest, while the 
opposite end is by no means symmetrical. Both the plates 
may be seen in their relative positions in figure 6. The whole 
surface of the larva appears under a low power to be shag- 
reened. but under higher magnification the integument is shown 
to be beautifully reticulated. 
The pupa is represented in figure 8. It is 4 millimetres in 
length and of a beautiful red colour, though considerably 
darker, even brownish, at the anterior end, where the wings, 
legs, and antennae of the future fly are plainly to be seen. At 
the sides of each segment of the abdomen are patches of tiny 
black scale-like hairs, these patches extending round the sides 
to well on to the dorsal surface. 
The male fly is a very beautiful creature about 3 milli- 
metres in length. The antennae are blackish brown, the joints 
bottle-shaped (see fig. 4) with several whorls of hairs on the 
swollen basal portion. Thorax shining black, with four con- 
spicuous longitudinal stripes, each composed of several rows 
of beautiful light golden scale-like hairs (see fig 1), two of the 
stripes running along the centre of the dorsum for practically 
its whole length, the other two occupying the extreme edges 
of the dorsum, commencing a little posterior to the central 
ones and terminating about the root of each wing ; scutellum 
and portion of dorsum immediately anterior to this blood-red. 
As mentioned by Rubsaamen, there is a blood-red stripe on 
each side of the thorax, running from the neck to the root . of 
the wing. This is only conspicuous however, in life. Abdomen 
blackish-brown to black above, with pale yellowish hairs, 
on the sides and below blood-red, fading to light yellowish- 
brown after death. Wing (fig. 2) light or dusky brown, very 
conspicuously hairy, the hairs by reflected light appearing light 
1914 Nov. 1. 
