EXERCISE XI. 
THE BLUE-BOTTLE FLY (Culliphora). 
Sub-kingdom—ARTHROPODA.  Class—INSECTA. Order—DIPTERA. 
Family—Muvscipz, 
1. General characters.—Kill the fly in the killing bottle. 
The body is distinctly divided into head, thorax, 
and abdomen. The head is hemispherical, with two 
large eyes, which are closely approximated in the 
male, but are wide apart in the female. The ocelli 
are three in number, on the top of the head between 
the eyes. The antenne are three jointed ; the third 
joint is flattened; it is four times as long as the 
second, and carries on its dorsal margin a plumose 
bristle. The proboscis ends in a fleshy Icbe, with 
single jointed maxillary palpi. The thoraw 1s very 
obscurely divided into prothorax, mesothorax, and 
metathorax, the first and last being very feebly de- 
veloped. The prothorax carries one pair of legs. 
The mesothorax carries a pair of legs and a pair of 
wings, and the metathorax carries a pair of legs and 
a pair of small club-shaped organs—the halteres— 
which are the rudimentary hind wings. The longi- 
tudinal veins of the wing are simple (w¢., not 
branched). The tarsi are five-jointed, and have 
between the claws two small cushions, or pulvillt. 
Behind the thorax is the triangular scutellwm; it 1s 
an appendage of the mesothorax; on either side of 
