INTRODUCTION 25 
months of the year when blowflies are not abundant. If these 
precautions cannot be taken, the animals concerned should be 
placed in sereened hospital stalls or confined in a small hospital 
pasture, where they can be kept under observation until their 
wounds are healed. 
The Bureau of Entomology and Plant Quarantine of the U. S. 
Department of Agriculture recommends either one of two 
materials for the treatment of myiasis eases in stock. The first, 
consisting of benzol to kill larvae and pine-tar oil to repel ovi- 
positing female blowflies, has been used by stockmen for many 
years with excellent results. The second, and preferable one, 
ealled ‘‘Formula 62,’’ is not designed to repel the flies but to 
kill the larvae in the wound and to prevent reinfestation by 
destroying any young larvae that hatch subsequently. 
The benzol-pine tar oil treatment is given as follows: Benzol 
(90 pereent) is applied to infested wounds by means of a rubber 
bulb syringe, and, after a few minutes, more benzol is applied 
and a cotton plug is inserted in the opening of the wound. 
Several minutes later the maggots will be either dead or stupe- 
fied, and the cotton plug and larvae may be removed with blunt- 
tipped forceps. Upon the removal of all maggots, blood and 
serous fluids may be cleaned from around the wound. If the 
animal is to be turned out where it may be reinfested, the wound 
must be protected from ovipositing blowflies, and this may be 
accomplished by an application of pine-tar oil (dehydrated, acid- 
free, specific gravity 1.065). The animal should be inspected 
every day and new applications of pine-tar oil made until the 
wound has completely healed. 
Formula 62 is prepared according to the following prescription: 
Diphenylamine (technical grade) .... 314 parts by wt. 
Petco melee Pi bicacvim cid, GAR fides 314 parts by wt. 
Turkey red oil (pH 10 or neutral).... 1° part by wt. 
Marsa? DIAG PEN Otte. Ceci oe te. 4 2 parts by wt. 
The diphenylamine is dissolved in the benzol, preferably by 
allowing the mixture of these two materials to stand for 12 to 
24 hours. Turkey red oil is added and the mixture thoroughly 
shaken. Lamp black is gradually stirred in and the mixing con- 
tinued until a consistency of molasses has been reached. The 
mixture is best applied to screwworm wounds by means of a 
l-inch paint brush. 
Precautions that should be observed in the preparation, storage, 
and use of this serewworm remedy are as follows: (1) As benzol 
is a highly inflammable liquid, lighted cigarettes, cigars, or open 
