64 Bureau of Farmers' Institutes. 



convenient crevice, affording some shelter from the elements. 

 The pinkish brown moths, plate 1, figure 5, appear from the latter 

 part of June into July, pair and deposit the eggs which produce 

 caterpillars another season. 



It is comparatively easy to collect and destroy the egg clusters, 

 as mofit of them are on the lower limbs. If the orchard is sys- 

 tematically eprayed, even this is unnecessary. The creatures 

 can also be destroyed when collected in their nests, either by 

 tearing the nests out and crushing, or by burning. The latter is 

 hardly advisable on account of Injury to the tree. 



Forest tent caterpillar. — A closely related insect and one which 

 attracted far more attention last summer is shown on the 

 next plate. It is variously known as the forest tent caterpillar 

 OP maple worm, scientifically as Clisiocamiya disstria, and is a 

 close relative of the preceding form. Like it, the winter is passed 

 by the well-developed caterpillar within the egg. The smaller, 

 shorter, lighter colored egg belt is represented at figure 1, plate 

 2. The eggs are frequently found in large numbers on small 

 sugar maples, if there be any in the vicinity. On moderate-sized 

 trees, a large proportion are found on twigs within twenty or 

 thirty feet of the ground, while on large trees it is not unusual 

 to find them in considerable numbers at a greater height. The 

 caterpillars begin to emerge from the eggs wdth the advent of 

 warm weather in the spring and continue to appear for about a 

 month. The first evidence of infestation, if the eggs have not 

 been previously noticed, is a thinning of the upper leaves. The 

 young caterpillars may be found in clusters on the branches, and 

 as they increase in size the clusters are found lower and lower, 

 till, when nearly full grown, large patches may be found on the 

 trunks of the infested trees. It will be seen by comparing fig- 

 ures 2 on plates 1 and 2, that the forest tent caterpillar is char- 

 acterized by the possession of a row of somewhat diamond- 

 shaped silvery spots down the middle of the back, while the 

 apple tree tent caterpillar has a narrow dorsal line of the same 

 color. The forest insect does not form a tent in the crotches of 

 the limbs, a habit so characteristic of the species usually found 



