THE AGRICULTURAL PESTS OF INDIA. 51 



Chilo saccharalis, Fcibricius. The borer of the Queensland 

 cane has been supposed to be the larva of this Diatrsea 

 sacchari. It enters the cane on its appearing above 

 ground, and eats up the heart. It is supposed to be 

 identical with the borer of the Mauritius, Proceras 

 sacchariphagus. Diatrsea sacchari is the Chilo saccharalis, 

 Fabricius. It occurs in the United States. The Mauri- 

 tius sugar-cane is one of the varieties now cultivated 

 in the North- Western Provinces of India, but it is not 

 known if the Diatrsea has accompanied it. 



Distoma hepaticum (Fasciola hepatica), Linn., the 

 liver-fluke, is found in France, and is not uncommon in 

 Holland, Sweden, Norway, and even in Greenland. The 

 liver-fluke is from T 8 o to ^ of an inch in length. It 

 causes great loss of sheep and cattle. Fasciola trachealis 

 inhabits the windpipe of birds. M. T. See Amphistoma. 



Dorcus titan, a large stag - beetle of Java, family 

 Lucanidae. 



Doryphora. Potato beetle, the Doryphora decein- 

 liiieatum, does not occur in India. The common fire-fly 

 or lightning bug, Photinus pyralis, has been often 

 mistaken for it. 



Drepanognathus saltator, Jerdon (or Harpegnathus salta- 

 tor, Jerdon), an ant of the Peninsula of India, of Malabar, 

 and Mysore, has the name saltator from its making sur- 

 prising jumps when alarmed or disturbed. It is very 

 pugnacious, and bites and stings very severely. 



Dry-rot, a disease affecting timber, is produced by the 

 attacks of several fungi. It increases in rapidity accord- 

 ing to the amount of potassium and phosphoric acid 

 which is contained in the wood where it occurs. Wood 

 felled in the spring is rich in both these materials, and 

 dry-rot spores are easily cultivated in it; but winter- 



