14 Department Circular 288, U. S. Dept. of Agriculture. 



Two specimens of the common h}Tnenopterous parasite Chalcis 

 ovata Say were bred from cocoons of this moth, and specimens of the 

 ichneumonid (Cryptus) Compsocryptus r etentor ^rulle emerged in 

 April from cocoons collected m November. 



REMEDIAL MEASURES. 



Fig. 11. — Exorista flaiirostris, a 

 parasite of the puss cater- 

 pillar. 



The logical procedure in a case of this kind is to prevent the occm*- 

 rence of stings by early destruction of the caterpillars, but this is 

 often not done. The pain from stings does 

 not seem to be reduced materially by appli- 

 cations of ammonia, soda packs, or perman- 

 ganate of potash, which might be expected 

 to counteract it. The use of tincture of 

 iodine on the lesions followed by cold appli- 

 cations apparently gives some relief. The 

 need is apparent of determining precisely 

 the toxic principle involved. This is especi- 

 ally true since the venom seems not to be an 

 acid, as in the case of most insect stings. 



The spraying of shade trees with lead arsen- 

 ate in the proportion of 7 pounds of powdered 

 arsenate oi lead to 150 gallons of water, with 

 4 pounds of dehydrated lime added, was found very satisfactory by 

 Alfred MacDonald, formerly city forester in 

 Dallas, Tex. In a few instances in which trees 

 were sprayed with this mixture the writer 

 checked up the results and found that where 

 there were about 100 caterpillars on a medium- 

 sized tree more than half of them were found 

 dead on the ground four days after spraying 

 and a few days later every live individual had 

 disappeared. Weaker strengths did not appear 

 to be satisfactory because of the slowness with 

 which the caterpillars were killed and the in- 

 creased danger of having them crawl about 

 and possibly produce stings. 



E. E. SchoU of the Texas Department of 

 Agriculture states that in some spraying 

 against this pest done in 1914 a combination contact and poison 

 spray was used with good results. He used an emulsion of engine oil 

 and soft soap — 2 gallons to 50 gallons of water — ^^^ith the addition 

 of 2 pounds of powdered arsenate of lead. 



Fig. 12. — Phornccra claripennis, 

 a parasite o f the puss cater- 

 pillar. 



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