previously widened hole. It had moved nearly 18 inches away from its original site. Considerable light can be shed on the relationships of the snare and glow-worm by putting some larvae into a deep glass dish, as in Text-fig. 2. To make a nest the larva uses the angle between the glass lid (L) and the side of the dish (D). Provided the lid of the dish does not haze over with water vapour, it is possible to examine the snare with a binocular microscope. The snare drawn in Text-fig. 1 was constructed in less than four hours, when the glass dish with larvae was put in a darkroom at midday and examined about 4.30 p.m. The larva was known to have spent about one hour examining the confines of the dish before it chose a place. In Text-fig. 2, the snare is shown in cross section, the black dot in the middle representing the section of the larva. The main runway in which it lies is mainly horizontal as in Text-fig. 1, which is drawn from the side by looking through the side of the dish. The larva lies with its ventral surface upwards, but it does move about so that the front of its body twists in any direction. Examination by the binocular microscope showed that Albert Norris was correct when he stated that the larva lived in a tube. From the left of (LO) to (HO) in Text-fig. 1, the larva is seen to occupy the centre of a glassy mucus runway, which at such places as at (P) seems to be hollow. As the larva moves backwards or forwards it does not push this glassy mucus in front of it, but just stretches it. The anal palps at (LO) where the light organ is situated, lie expanded within transparent mucus in which movements of the palps can take place. If it wishes, the larva can poke its head out of the tube anywhere, the contour of the latter being restored when the larva passes back into it. The exact relation of the silk lines to the mucus is not understood, but outside the runway, some of the stretchers have mucus droplets held in their angles as at (A). Here the silk and the mucus appear clearly separate, but there seems to be some evidence that the animal is able simultaneously to secrete mucus and silk mixed. The stretchers holding the runway are undoubtedly silk, but where they touch the runway, they pull the mucus out into a cone. The vertical lines (V) were usually not immediately attached to the runway, but were fixed a little off it by side lines (S). The larva which made the snare in Text-fig. 1 was removed that evening to an inverted beaker or a tray on which two rotten branches were set up. During that night it constructed most of another snare (Text-fig. 3) in the only favourable place where vertical lines could be made. Another smaller larva put on the branches at the same time had no place, and stayed in the moss near the ground. It disappeared, probably eaten. The manner in which the droplets appeared on the silk vertical lines could not at first be observed. They may at first be a continuous outer layer which, by some form of surface tension, resolves into droplets, or they may be secreted one by one. On apriori grounds the former possibility would seem the more likely, but recent observation shows that the latter is correct. Not all the beads were spherical, some being ovoid or pendant droplets. Larvae at Arapuni from a very dry bank, when placed in a very damp atmosphere, produced vertical lines on which the mucus droplets had run together into larger disorderly droplets which usually sank down to the bottom of the silk thread. Conditions of Pupation and Possible Phototropism of Adults In the few cases where pupae or pupal exuviae have been found, it has been stated that the area around at least two inches in diameter is clear of other larvae and their sticky snares. Moreover, the pupa hangs suspended on a long support (Pl. 23, Fig. 2, SU). This would give the imago the opportunity of emerging without being caught by its own, and the sticky snares of neighbouring glow-worms. The larva possibly clears away parts of its own web before pupating. It has been