THE PASSING OF THE TREES 183 
4. “Glow-worms” (Lampyride), having the body 
elongate taperifig to the ends, flattened on the 
back, with well-developed legs and usually a pig- 
mented skin. 
5. ‘White grubs” (Scarabeide), having the short thick 
body bent double upon itself, so that the grub lies 
on its side, the legs well developed; the white skin 
bristly, and the blunt hinder end of the body 
smooth and shiny. 
6. Pyrochroid beetle larve (Pyrochroidz), having the 
body very thin and flat, its sides parallel, the legs 
well developed, the skin brown, and a pair of stout 
upturned hooks at the end of the abdomen. 
Ill. Fly larve (Order Diptera), having cylindric legless 
bodies that taper from rear to front, the head being apparently 
wanting. Three families commonly are found. 
1. Fungus-gnat larvee (Mycetophilide), of minute size, 
white and soft, usually occurring gregariously 
under bark. 
2. Snipe-fly larve (Leptide), of similar form but larger 
and with the pointed front end of the body of a 
deep brown color, usually found in rotting wood 
(fig. 703) 
3. Crane-fly larve (Tipulidae), less tapering, more cylin- 
dric, with the head end more bluntly pointed, and 
with a respiratory disc upon the rear end in the 
midst of which may be seen the openings of a pair 
of breathing tubes. Skin tough and more or less 
leathery. 
IV. Horn-tail larvae (Order Hymenoptera), having a 
long smoothly-cylindric white body with a prominent spine 
on the posterior end, rudimentary thoracic legs, and a 
small but distinct head placed low down at the front end; 
living in large clean-cut holes that are usually disposed in 
groups in dead or living trees. 
