_ New York AcricutturaL Experiment Srarion. 301 
tween the third and fourth molts. The periods of molting and the 
markings were observed and recorded by C. V. Riley*’ in 1870. 
The following descriptions do not differ essentially from. those 
given by him. The caterpillars just after leaving the eggs meas- 
ure on the average 2 mm. in length. They are dull black in color 
with long grayish-white hairs arising from numerous minute 
tubercles. In a few days there is a slight change in color. The 
middle of the body becomes lighter, taking on a brownish tinge, 
while the extremities remain darker. The tubercles also become 
more distinct and a dark interrupted line conspicuous along each 
side. These markings become more prominent as the time for the 
first molt approaches. 
The first molt.— The first molt occurs from ten days to three 
weeks after the caterpillars emerge from the eggs, the variation 
in time probably depending upon the abundance of the food sup- 
ply. Immediately after the first molt they measure about one- 
half inch in length. There are two pale yellowish sub-dorsal lines 
bordering the dark lines above referred to. These lines become 
more conspicuous as the time for the second molt approaches; the 
dorsal spots are also indistinctly seen. 
The second molt.— This molt occurs from a week to ten days 
after the first when the length is about three-fourths of an inch. 
A row of eleven cream-white somewhat diamond shaped or club- 
shaped spots extends the full length of the back. Also as Dr. 
Riley states in the reference above given: “The upper pale line 
becomes yellow, the lower one white, and the space between them 
bluish.” mpi 
The third molt—— The third molt occurs about a week to ten 
days after the second. The caterpillars measure about one inch 
in length. ‘There is little change in the markings except that they 
become more distinct. 
The fourth molt.— Between the third and fourth molts is the 
most rapid-growing period of the larval life. After the fourth 

17 Amer. Ent. and Bot., 2: 262, 
