Life History of Hesperia sidae, Esp. 571 
any fresh feeding, and on January 7, 1910, I noticed that 
the tent was still very well sealed up, as it had been for 
two months. The weather was very cold, with several 
frosts at the end of November and beginning of December, 
mild and damp from the middle to the end of December. 
It was fine and calm in January, with warm days and cold 
nights, there being sometimes a little frost. The winter 
tent is tightly closed by an inner lining of silk. It is not 
at all conspicuous. Three of the spun-up leaves composing 
it have died and are blackened ; others are green and faded 
yellow. 
At the beginning of March I opened this tent and found 
it empty. The larva had recently left it and had made a 
much larger tent on the other side of the plant. Five 
leaves had been drawn together for this purpose. The 
nest was well concealed. It was almost completely closed 
up by the silk work inside. Some of the divisions belong- 
ing to the tent leaves, and one or two adjacent leaves had 
gaps in them, showing that the larva had fed. It was 
then in its final stage (5th ?), but I could find no cast skin 
or head case in either the winter tent or in the new one. 
It was certainly not in this stage, however, when it went 
into winter quarters. The nests had hardly any frass in 
them. 
Throughout the month of March the larva lived in the 
same nest. Although I kept as close a watch on it as was 
possible, I never saw it outside its tent or feeding. It ate 
very little; only a few free divisions of those leaves com- 
posing the tent and two other leaves near by bore any 
traces of feeding. Iam not able to say at what time of day 
or night it feeds. It certainly did not leave its tent for 
long at a time. Its movements were slow when disturbed, 
and were always preceded by much silk-spinning. 
At the beginning of April the larva was well advanced 
in the last stage. On April 3 I made some notes on its 
appearance. It was then 20 mm. in length. Width of 
head 2°75 mm. 
Head rather large, each lobe top rising slightly above the central 
division but not enough to give the appearance of horns; it is 
rounded, with no sharp angles ; colour uniform dull black, surface 
granular; labrum pale yellow, shiny ; ‘antennae and jaws black. 
The head is covered with rather short, stiff-looking brown hairs, and 
a few much longer hairs with a bend in them. These hairs, four or 
