FISHERIES, GAME AND FORESTS. 363 



among the more important ichneumon parasites. The last named is more abundant 

 than the two preceding", and unfortunately it is probably a hyperparasite preying on 

 the beneficial Pimplas. CJialcis ovata Say is a minute, four winged fly which was 

 reared from this species by Dr Lintner. DibracJiys bottcJieanus Ratz., a common 

 hyperparasite, was also reared from this insect by Dr Lintner. 



Remedies. The spread of this insect is dependent almost wholly on the wander- 

 ing of the larvae, which must be very limited on account of their cumbersome load. 

 This, in connection with the eggs being deposited in a stout, conspicuous case, which 

 remains on the trees all winter and is easily removed, renders the control of the 

 insect, by collecting the bags at this time and burning them, comparatively easy. 

 This caterpillar is a leaf feeder and yields readily to arsenical poisons. Evergreens 

 are quite susceptible to arsenic and therefore the arsenate of lead has been recom- 

 mended. Dr Smith advises the use of at least 15 ounces of the arsenate to 40 

 gallons of water for the purpose of securing the prompt destruction of the pests. 



Pall Web Worm. 



HypJiantria cunea Drury. 



The conspicuous webs of this caterpillar are very familiar objects the latter part 

 of summer. They may be recognized at once by their inclosing all the leaves of a 

 twig or branch and if these features are kept in mind there will be no danger of con- 

 founding this species with the apple tree tent caterpillar, a pest which forms webs in 

 early spring in the crotches of the limbs and does not inclose leaves within its webs. 

 The hairy fall web worms feed under their tent on the softer upper portions of the 

 foliage which soon dries. The beauty of the tree is seriously marred by the 

 unsightly nests and the brown, skeletonized foliage within them. Occasionally this 

 insect is present in such large numbers as to devour most of the foliage, and in 

 southern cities entire rows of trees may have their leaves destroyed by this pest. 



Distribution. This insect is an American species and occurs from Canada to 

 Georgia and certainly as far west as Montana and Texas. It appears to be more 

 injurious in some of the southern states like Kentucky, where the development of a 

 vigorous second generation is the rule, than it is farther north. 



Description. The yellowish, globular eggs (Plate 2, figure 1) are deposited in 

 clusters of one to three hundred, usually on the under side of the leaf. The yellow 

 changes to a dull leaden hue, due to the developed caterpillar within, just before the 

 eggs hatch. 



