1214 The American Naturalist. [December, 
They evidently produce considerable irritation, for the part is always 
swollen and constantly bleeding. This swollen, gaping appearance of 
the wounds, together with the constant discharge of blood, are charac- 
teristic of the presence of worms. It seems to require about a week for 
the worms to become fully grown. At that time they are about five- 
eighths to six-eighths of aninch long. They then leave the sore and go 
into the ground, where they pass the pupa state, and hatch out as flies 
in from nine to twelve days. Of several hundred hatched out by the 
writer, the shortest time was nine days and the longest fourteen days, but 
in the majority of cases it required from nine to twelve days. While the 
larve are thus developing the flies are constantly laying fresh eggs in 
the wounds, so that the young worms take the place of the matured 
ones, and thus keep up a constant and progressive loss of tissue. If 
the worms are not killed they eat constantly deeper, and often kill the 
animal, Sometimes the abdomen is opened and the bowels escape— 
as is especially liable in case of heifers spayed through the abdomen. 
At other times a tail is eaten off, or extensive caverns are made into 
the muscles, 
‘“ The treatment usually employed in these cases consists simply of 
killing the larvze with cresylic ointment, calomel, pudo or car- 
bolic acid.’’ 
In the accompanying plate the eggs are shown at æ and 4, the first 
representing a single egg, greatly enlarged, and the second a bunch 
of eggs, also enlarged ; thelarva is represented at c, and the puparium 
at d and e, the former showing the mode of exit of the fly, which is 
represented at fand A, while g represents a side view of the head. 
The egg of this insect is 1 mm. long, whitish, and cylindrical, with 
alongitudinal ridge on one side. The full-grown larva is 16 mm. 
long by 4 mm. in diameter. It is a whitish, footless grub, with trans- 
verse rows of stiff black bristles at each articulation. The puparium 
is brown, ro mm, long by 3 mm. thick. The imago is described as 
follows: Length, ro mm.; wing expanse, 21 mm.; color, metallic 
bluish-green, with golden reflections ; thorax, with three black longi- 
tudinal stripes; head, except central portion of eyes, yellow ; legs, 
lack; wing veins, black ; wings transparent, except near base, where 
they are slightly clouded. Entire body furnished with long, black, 
spinose hairs. Proboscis of medium length, with dilated tip. 
The past summer this insect appeared in injurious numbers in parts 
of Louisiana and Mississippi, where it has seldom heretofore attracted 
attention. Prof. Morgan thinks it was imported the previous season 
with Texas cattle, and on account of the mild winter was not killed by 
