( 12 ) 
secured it by passing a long fine rod of twisted paper 
just moistened at the tip with chloroform beneath it; 
this stupefied but did not quite kill it, so that I could 
observe it with very slight disturbance from movements 
of the insect. 
About three hours after being first noticed the abdo¬ 
men, as seen with a 1-inch power, was of various tints 
of a yellow-brown colour.* The following morning, on 
investigation of details, the thorax was black above, 
yellow or pale yellowish brown beneath the root of the 
wing, and with another patch of the same colour in 
front,—that is to say, a patch about half-way down on 
each side of the prothorax. The six segments of the 
abdomen nearest the thorax of a raspberry colour, paler 
below, with a broad black transverse band extending 
over the back and half-way down the side of each 
segment, which was also marked with a well-defined 
black velvety patch on each side. The terminal segments 
of the abdomen and the extended ovipositor were of 
nearly the same shade of yellow, or pale yellowish brown 
as the patches on the side of the fore body, and the ovi¬ 
positor was not furnished with lamellulgc at the extremity. 
The 7th and part of the 8th segments were marked 
above with a small Y-shaped figure with a fine line on 
each side, parallel to the sides of the Y, the lowest end 
of the V pointing backwards. This figure was only 
noticeable when the abdomen was seen from above, and 
was not of deep tint. 
The halteres or poisers were of a bluntly-pointed 
club-shape at the extremity, and yellow with a sprinkling 
of hairs, which in some lights gave a blackish tint to the 
upper part and also to the base of the club, and at this 
stage there was a marking of raspberry-red just about 
the middle of the poisers. The body and abdomen were 
in parts very hairy, and the black velvety patches on 
the sides of the abdomen appeared to be composed of 
* For fuller descriptions than I can give from my own observations of 
the early changes of colour the reader is referred to Dr. Wagner’s paper 
previously referred to. 
