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in the P¿impa Central about General Acha. Here 1 must have 

 seen at least two hundred of them in one small held where 

 very many had hopped into a ditch that had been dug to check 

 the onward movement of the marching" saltonas. Their im- 

 prisonment instead of being a matter to worry about only made 

 their work the easier. When the locusts dropped into the ditch 

 they were eaten one by one as the toads found there was room 

 for more locusts. 



Frogs of several species leave the water and scatter out over 

 the land in search oí food. Some of these aquatic animals have 

 been observed several miles and even leagues from water. 

 That they find a bountiful supply of locusts for food can be 

 attested by their swelling sides. Lizards, too, capture both the 

 saltonas and voladoras. The writer has frequently seen the 

 common lizard of the pampas with a full-grown ScJiistoccrca 

 payaiieiisis in its mouth, which it was carrying as a cat would 

 a mouse. The larger lizards and " iguanas " have similar 

 habits, while it is a well known fact that serpents capture and 

 feed upon various kinds of insects. 



The numbers of the locust that must annually be destroyed 

 by these various animals throughout the Republic would most 

 certainly make a difference were they permitted to live and 

 multiply. 



Mammals. 



Nearly every kind of domestic animal, aside from fowls, 

 is known at times to feed more or less freely on the winged 

 insect. The cat, dog, horse, cow, goat, sheep, hog, and even 

 rabbit, have all been either reported as eating them under cer- 

 tain conditions or have been detected in the act by m^'self or 

 assistants. The wild relatives of these animals are even more 

 persistent in destroying the locust than are their domes- 

 ticated allies. Add to these such animals as the skunk, weasels, 

 opossums, the various rodents, the armadillos, and even 

 monkeys, and Ave certainly have quite an el'fective army at 

 work on our side. 



During a trip made into the Pampa Central it was learned 

 that several guanacos had recently been killed, Ihe stomachs of 

 which were quite filled with fragments of the fl3-ing locusts. 

 Even this animal, that some proprietors of estancias had been 

 in the habit of having killed because of its being in the way, has 

 thus be en proven useful. 



