48 
The Bulletin 
Posteriorly to the prominent pair there is a group of three hairs above 
the spiracle and four on the fleshy ventral protuberance. There is a 
pair each of the dorsal lobes of the mesothorax and metathorax. Three 
hairs on the dorso-lateral lobe of the mesothorax and two hairs on the 
metathorax. A single hair on each of the lateral lobes, ventro-lateral 
lobes, and the fleshy ventral protuberance of both the meso- and meta- 
tliorax. The ventral lobes of each thoracic segment are provided with 
a median pair of hairs. 
Figure 23. Frontal view of head of larva 
to show arrangement of hairs. 
Figure 24. Seventh, eighth, and ninth ab¬ 
dominal segments of larva to show ar¬ 
rangement of hairs. 
Abdominal segments forming on the dorsum a narrow transverse 
fold, separated by two wider folds; the eighth and ninth abdominal 
segments excavated above without dorsal folds; ventrally the first three 
segments contracted, the succeeding segments enlarged; laterally each 
segment has numerous longitudinal folds; abdominal spiracles smaller 
than prothoraeic pair, eight pairs; the first seven pairs situated just 
above the lateral folds, the eighth pair situated in the excavation of 
the eighth abdominal segment; the eighth pair larger than the other 
abdominal spiracles, equaling the prothoraeic pair; all with chitinous 
margins of dark brown color. 
Each abdominal segment from one to seven has a pair of dorsal hairs, 
a single hair on each lateral and ventro-lateral lobe. 
The arrangement of the hairs on the seventh, eighth, and ninth ab¬ 
dominal segments is quite characteristic, and is shown in Fig. 24. 
METHODS OF REARING LARVAE 
Several different methods have been used for rearing larvae in the 
-course of this investigation. Practically all of our larvae have been 
reared on the portion of the main s f em of the corn plant just above the 
roots. In placing them in these pieces of corn stem, they were at first 
placed in a small cavity hollowed out of one side. Later it was found 
that it was much easier to watch them from day to day if the piece of 
