374 Report of the Entomologists of the 



trunks of the trees partially protected by the loose bark, in the 

 grass under the trees, in protected places in and about the fences 

 and in the angles about the eaves and window casings and along 

 the sides of outbuildings. Not unfrequently the outbuildings 

 seem to be the favorite place for pupation. In several badly in- 

 fested orchards under observation last year it was found that when 

 ready to pupate most of the caterpillars deserted the orchards and 

 spun their cocoons upon nearby buildings. The cocoons spun in 

 the grass were usually in a nearly upright position, and were sup- 

 ported by numerous threads of silk leading to neighboring blades 

 of grass. 



Figure G is from a photograph of a bunch of cocoons taken from 

 a building upon which the caterpillars congregated in large num- 

 bers to pupate. 



The length of time required for the pupa stage varies. Fitch 

 cites instances where the pupa stage lasted from 14 to 2G days, and 

 from observations upon 9 caterpillars kept in confinement he found 

 the average time required about 3 weeks. About 100 caterpillars 

 under the writer's observation last year pupated during the first 

 week in June, and those that matured emerged between June 27 

 ♦and July 1. A few did not emerge until July 8. 



The adults. — The adults are reddish-brown moths of the size 

 shown in Plate XXXIV, Figs 1 to 4. The marks by which they 

 are most readily distinguished are two nearly parallel white lines 

 which extend obliquely across the fore wings. 



The following detailed description is from one of Dr. Fitch's 10 

 reports : 



The winged moths are of a dull reddish or fox color, different individ- 

 uals varying in the depth of their coloring, the females being often 

 paler, approaching to grayish, and the males often darker, sometimes 

 brown, with scarcely any tinge of red. The mark by which this species 

 is most readily distinguished is two straight, white stripes which extend 

 obliquely across the fore wings, parallel to each other, and to the hind 

 margin, dividing the v^iug into three nearly equal portions. The anterior 

 stripe is often slightly broader than the posterior one, especially towards 



io Second Rpt., pp. 190, 197. 



