224 Proceedings of the Royal Physical Society. 
abdominal segments. The thoracic segments each bear a pair of five- 
jointed legs or feet. 
The Head. 
The head of the larva viewed from above with a high-power lens, or 
better with a dissecting microscope, shows the following parts (Fig. 2) :— 
The Frons (f)—A large triangular region occupying the middle of the 
area in view. 
The Lpicranium (ep.)—A divided region adjoining the frons, from 
Fig2. 
Head of larva of A. domesticwm seen from above. 
which it is separated by the frontal sutures which unite posteriorly to 
meet the epicranial suture (e.s.) which runs backward. 
The Antenna (a) lie in two little pits, one at each extremity of the 
anterior border of the frons. 
The Lpistome (e)—A narrow, thicker band of chitin, extends from pit 
to pit along the anterior border of the frons. 
The Clypeus (c)—A broader transverse plate, adjoins the epistome along 
the middle third of its anterior border. 
The Labrum (/)—A somewhat narrower plate covered with tiny bristles, 
adjoins the anterior border of the clypeus. 
The Mandibles are seen below the clypeus and labrum extending from 
side to side of the head and meeting in the median line. They are dark 
brown in nature and have been coloured black in the figure. 
