148 INSFXTS OF ECONO^lIC IMPORTANCE 



weeks and there are four or five broods in a season. 

 The adults have a habit of gatherin^^ on the bases 

 of the horns but cause no injury at this place; the 

 flies are common from ]\Iay until frosts of autumn. 

 Control — Almost any greasy substance, like 

 axle grease, fish oil, kerosene emulsion, crude pe- 

 troleum, etc., applied to the afliicted parts will keep 

 the flies away for several days; where sores are 

 formed, add a little carbolic acid to the grease or 

 oil ; tobacco powder will kill the flies if it is dusted 

 on them ; spread out or mix lime with the fresh cow 

 droppings ; spray cows with crude petroleum. Also 

 see repellant mixtures, p. 152'. 



Sucking cattle lice ^ (Hccmatopiuits citry- 



sterniis) 

 (LinognatJiiis vituli) 

 Order — Hemiptera 



There are two species of suckino- lice, the short- 

 nosed ox louse and the long-nosed ox louse; they 

 are apt to be abundant especially on calves and on 

 poorly cared for and ill-fed cattle; on these they 

 mav cause injury. 



The eggs are attached to the hairs of the animal 

 and the young lice gradually develop to the adults. 



Control — An infusion of stavesacre seeds seems 

 to be the most accepted remedy. Four ounces 

 stavesacre (Delphinium) seeds, i ounce white helle- 

 bore boiled in i gallon of water until only 2 quarts 

 remain and applied with a brush where lice are 

 seen; kerosene emulsion, 15%, or crude petroleum 

 rubbed in among the hairs; 2 or 3 applications of 

 either at an interval of one week; raw linseed oil 

 has been recommended; it is applied with a brush 

 but one must not rub too vigorously. 



6 Imes — U. S. Dept. Agr., Ear's' Bull. 909. 

 Lamson — Conn. (Storrs) Expt. Stat., Bull. 97. 



