﻿102 BULLETIlSr 1369, IT. S, DEPARTMENT OF AGEICULTUEE 



type (fig. 38). These permit one to place the tips well into the hole 

 and then to open them and secure a firm hold on the grub. Another 

 ty]3e which has been found very successful is a simple forceps with 

 stout shanks and provided at the tip Avith minute mouse-teeth. 

 These, however, often puncture the grub, which might be considered 

 objectionable by some. 



The enlargement of the grub holes in the hide by cutting, is a 

 method suggested by some, especially by veterinarians. It has been 

 found that in most cases this practice causes the host too much dis- 

 comfort. There is also the possibility of cutting through the cyst, 

 if the incision is made too deeply, and thus allowing some of the 

 foreign matter to enter the tissues of the host. 



Certain stockmen have for years practiced the plan of puncturing 

 the grub before attempting to extract it. This led the writers to 



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ViG. o7. — Itemoviug Hypoderma larva; from back of cow by means of suction pump of 



the Brodersen type 



make a series of tests of this method. One of the procedures followed 

 was to press firmly around the grub, thus bringing it up to the 

 aperture in the skin, and then to clip the posterior end with a pair 

 of fine-pointed scissors. A small amount of pressure applied to the 

 cyst will expel the contents of the larva, after which the skin of the 

 grub may be easily extracted by pressure, or better, with a pair of 

 forceps. In certain instances grubs punctured in the way described 

 were left in the host. In a short time it was found that the skins of 

 most of these grubs had protruded some distance from the holes in 

 the skin, thus enabling one to remove them easily with the fingers. 



EFFECT ON HOST OF DESTRUCTION AND EXTRACTION OF GRUBS 



Despite the very general practice of extracting grubs by hand 

 which has been employed for many years, not until recently have 



