Apr. 15, 1914 
Corn-Leaf Blotch Miner 
25 
locality. Some individuals that pupated in January and February 
were apparently alive and in good condition as late as the 25th of April. 
Table I .—Length of pupal stage of Agromyza parvicornis in Florida. 
Number of 
individuals. 
1 Pupated— 
Adult 
emerged— 
Length of 
stage. 
Days . 
1 
Feb. 1 
Mar. 4 
3 2 
1 
1 
4 
32 
1 
20 
16 
24 
I 
20 
*9 
27 
1 
Mar. 8 
30 
22 
I 
Apr. 3 
20 
6 
157 
Average length of pupal stage for 6 indi¬ 
viduals, 26.2 days. 
1 Two individuals pupated on Jan. 24 were still alive and healthy on Mar. 22. 
In Indiana, as stated previously in this paper, individuals that pupated 
in the middle of August, 1912, and had been kept indoors since fall, 
disclosed adults in January and February, 1913. 
The Florida data show conclusively that this insect will breed con¬ 
tinuously, except in a few isolated instances, throughout the year, if its 
host plants are supplied a*id no freezing temperatures are encountered. 
REARING METHODS 
Several kinds of rearing cages were tried in this work, but it was 
found that the use of the one shown in Plate II, figure 2, was attended 
with the greatest success. It consists of a 12-inch flowerpot and a collar 
made of fine-mesh brass strainer wire with supports of galvanized iron, 
into which is fitted a large electric-light globe—the kind used on street 
fights—the top of which is covered with cheesecloth. There is a free 
circulation of air through the cage and moisture does not collect on the 
sides so readily as in other types, thus giving more nearly normal con¬ 
ditions. These cages were kept under a shelter so that direct rays of 
the sun did not strike them, and the miners were very easily reared in 
them. Plate II, figure 1, illustrates the rearing shelter with the cages 
in place. 
PARASITIC ENEMIES 
There are 18 species of hymenopterous parasites that may be said 
with reasonable certainty to attack Agromyza parvicornis , since there is 
as yet no proof that any are secondary parasites. Three of these are 
