54 AN ACCOUNT OF BRITISH FLIES. 
have the power of climbing up between the leaf-sheath and stem untilh 
they find an opening through which the imago can emerge. 
A hard, sharp beak takes the place of the anchor-process, often 
used by the pup for cutting an opening through the leaf-sheath. 
The fly breaks the pupal skin and emerges at the end of twelve or 
thirteen days. 
The Perfect Insect.— 9 Larger than the male. Length 3 mm. 
Eyes brownish-black ; front of head black, and clothed with dark, 
long hairs. Palpi yellowish, composed of four joints, partly covered 
by minute black scales, entirely covering the terminal joint. Antennz 
yellowish-brown to almost black, composed of seventeen joints, with 
short, black verticillate hairs.* The first two joints (basal joints) very 
thick ; the first joint is cup-shaped, the second globular, the next 
smooth, cylindrical and elongated, gradually becoming smaller and 
terminating in a long, tapering point, longer than any of the 
preceding. 
The proboscis is minute and rose-coloured. Thorax black, with 
gray tints in certain lights, white hairs on the sides, and also scattered 
on the central region. 
Scutellum black, hairy. Halteres yellowish-pink, with occasional 
black scales. There is also a light-red line running from the neck to 
the base of the wing along the side of the thorax. 
The abdomen is pinkish, or yellowish-brown, and is composed of 
eight segments. The first segment is nearly black, the remainder 
are marked by a large, square, black spot on each side. These 
black markings nearly unite on the seventh and eighth segments. 
The last two segments have a curious V-shaped marking, with two 
small lines, one on each side of it, and placed on a somewhat darker 
area than the yellowish colour of the segments.+ The ventral sur- 
face is marked also by a line of black spots running down the centre. 
The oviduct is pale reddish-yellow, brownish at the tip, and composed 
of three joints. The last is pointed, and wéthout lamelle. 
Legs pink to light red, clothed by black, scale-like hairs. Troch- 
anters black, coxze brown, other joints yellowish-white. 
Wings pink at the base, clothed by black hairs. The second 
longitudinal vein runs nearly straight, and then bends down and 
reaches the margin above the apex. 
6 Smaller and more elongated than the female, 2 mm. in length. 
The antennz are composed of seventeen joints, as in the ? ; they 
* Enock describes the hairs as red. 
_t First discovered by Miss Ormerod. Dr. Meade, in his description, say she 
did not observe this V-shaped mark. 
