44 NEW YORK STATE MUSEUM 



in large numbers from tlie forest tent-caterpillar tMs past season, 

 and it preys on a number of other very injurious insects. 



Fig. 82 Pimplaconquisitorra larva; & head of same; c pupa; d adult female, all enlarged 

 (after Howard, U. S. dep't agr., div. ent., tech. ser., no. 5) 



91 Red tailed Tachina fly (W intbemia 4-pustulata). 

 A most valuable parasite of the army worm, tent-caterpillar and 

 several other pests. This fly has been observed in considerable 

 numbers in fields badly infested with army worms, and is doubt- 

 less a most efficient parasite in 

 keeping this pest under control. 



FORMULAS 



Internal poisons like paris green 

 are used only against insects which 

 devour their food. Place where 



FIG. 83 Red tailed Tachina fly: larva. they mUSt bC eatCU if the plant iS 

 fly and puparlum; also its eggs placed on 

 the fore part of an army worm attacked aud On nothlUg SOOU tO be 



used for human food. Much depends on the thoroughness with 

 which the application is made. 



Paris green 1 pound, lime 1 pound, water 100 to 300 gallons, or 

 dry 1 pound to 75 of plaster or flour. London purple and pa/ragrene 

 mav be used in the same manner. 



