The Foebst Catehpii.lar 



123 



FIGURE 5. LARVA OR CATERPILLAR OF 

 THE FOREST CATERPILLAR 

 ». Upper part of one ring b 

 After Weed 



somewhat different in the two sexes. In both the general color of the body 

 is yellowish brown, darker in some specimens, lighter in others (note 

 lower row plate II, gradation from light to dark tints); and in some there 

 is a decided reddish cast. Running obliquely across the front wings, are 

 two lines, well shown in the figures, which are much the color of iron rust. 



iWNVW/lll/lH/FiUllWl////^ ^^''•*' ®°°" ^^*^'' coming out of 

 ' the cocoon, the moths pair and 

 the females lay the eggs on the 

 twigs of some tree in the manner 

 already described. The follow- 

 ing dates are furnished by Prof. 

 H. M. Seely of Middlebury : June 

 8th, first cocoons observed. June 

 9th, considerable number of cat- 

 erpillars beginning to spin. June 

 13th, large numbers spinning. 

 June 17th, some caterpillars 

 changing to pupae, some still 

 Side of rine spinning, but most in cocoons. 

 June 30th, first moth seen. July 



1st, many moths seen. July 5th, picked egg cluster from maple tree. 



These dates are for 1899, but are a fair average for this region. 



DIFFERENCES BETWEEN THE FOREST CATERPILLAR AND THE APPLE TREE TENT-CAT- 

 ERPILLAR 



The frequent association of these two species has already been noticed, 

 but a more detailed comparison will be useful. Figures 5 and 6 show plain- 

 ly the most obvious differences seen in the fully grown larvse, especially at 

 a and 6 where the markings on a single joint are shown enlarged. In Figures 

 7 and 8 are seen moths of the forest caterpillar while Figures 9 and 10 

 show the moths of the tent cat- 

 erpillar. Plate I also shows 

 the two species clustered on the 

 web of the tent caterpillar. A 

 careful study of these figures 

 will enable any one to distin- 

 guish one from the other. The 

 most easily noticed character in 

 the larvse is found in the light 

 marking along the back. In the 

 tent caterpillar there is a con- 

 tinuous line, while in the forest 

 caterpillar, there is not a line, 

 but, as figure 5 shows, arpw of 



a 



FIGURE 6 



LARVA OF THE TENT-CATER- 

 PILLAR 

 Upper part of ring. b. Side of one i;ing 

 After We*d 



