438 Saw-Fly Slugs and Worms. 
Saw-Fly Worms——There are several larvae of saw-flies 
which do much injury to pear trees, currants, etc., by eating the 
whole leaf substance except the larger ribs. The worms are 
small, not slimy like the pear slug, the one infesting the pear 
The Pear and Cherry Slug (a) and Saw-fly Worm. 
being about half an inch when fully grown. Its general appear- 
ance and work are shown by the engraving. The most avail- 
able remedy is a Paris green spray. 
Large Caterpillars on Grape-vines—The grape-vine is often 
seriously injured by the attacks of very large leaf-eating worms 
two inches and upwards in length, sometimes with a large horn, 
Sphinx-moth Larva on Grapeavines. 
or spine, sometimes without. They are larvae of several species 
of Sphinx moths or humming-bird moths, and of swallow-tail 
butterflies (papilio). The worms can be killed by Paris green 
