114 Forty-third Report on the State Museum. [18] 



muscular coating in extrication from the warble and burying for 



pupation, it being unprovided with feet. 



Figure 7 represents a section of the terminal tip of the larva during 

 its boring period, with its pair of spiracles 

 communicating with the two tracheal tubes 

 which traverse the larva, and are seen to be 

 tied together near their origin by a cross- 

 connecting tube. * 



The larvse commence to mature (their 

 development not being uniform) during the 

 month of May, when they crowd themselves 

 out through the hole in the warble, fall to the 

 ground and bury themselves for pupation. 

 The pupal period is of about four weeks' 

 Fig. 7.— The ia,rval bi oath- duration, at the expiration of which the fly 



ing-tabes. ( After Ormerod.) emerges and makes its appearance abroad, 



in readiness to deposit its eggs for another brood. 



Preventives, and Kemedies. 



From the unequal development of the warble above referred to, 

 the flies continue to ap|)ear abroad for quite a long period, viz., dur- 

 ing the months of June, July, and August. If preventives of the 

 attack of the fly are to be employed, it will be necessary to apply 

 them from time to time throughout the above-named months. 



Of preventives, the following may be mentioned : Dry sulphur 

 rubbed in on the back is recommended. Dressing the back with the 

 McDougall sheep-dip (sold by many druggists in our large cities, and 

 advertised in our agricultural journals by the American agents, 

 F. Porter Thayer & Sons, 104 Chambers street, New York) has proved 

 quite efficient, as has been extensively tested in England. But per- 

 haps a still better preventive may be prepared by mixing one 

 quart of whale-oil soap, one gill of oil of tar, and four ounces 

 of flour of sulphur. Its application is to be made with a brush on 

 both sides of the spine of the animal, once a week during the period 

 of the egg-laying of the fly — June, July, and August, as before 

 stated. 



But beyond all question the best (from its being the most simple 

 and the most practicable) method of dealing with the warble insect, 

 is to kill the larva. The efficacy of this method will appear from these 

 facts : The fly seldom wanders to any distance for oviposition, but 

 almost entirely confines its range to the farm where it had its birth; 

 and experience has shown that when careful examination of the cattle 



