REPORT OF THE STATE ENTOMOLOGIST I907 25 



were then destroying forests of hickory and chestnut and, in addi- 

 tion, inflicting much damage on fruit trees. A later outbreak in 

 Iowa was recorded by Prof. Herbert Osborn in 1896. He states 

 that this species was unusually destructive in one of the south- 

 eastern counties (Washington), a correspondent of his reporting 

 that the measuring worms had defoliated " acres and acres " of 

 timber land. There is, in addition, the outbreak in the Catskill 

 forests mentioned above. 



This measuring worm appears to be making a place for itself 

 among the more destructive leaf feeders affecting some of our 

 fruit trees, particularly the apple. The outbreak in the Georgia 

 forests referred to above, was accompanied by much injury to 

 fruit trees in that vicinity. Prof. H. Garman, writing of this insect 

 in 1904, states that this species has for several seasons been very 

 injurious to an apple orchard in Muhlenberg county, Ky. It would 

 not be surprising if a number of outbreaks, hitherto attributed to 

 our more common canker worms, were in reality the work of 

 this species. 



Description. The eggs of this moth are about the size of a 

 small pin head, conical in shape, somewhat coiapressed at the 

 points. They are first yellowish, then olive-green and later dark 

 brown. They are covered with a thick, sticky, glutinous matter 

 and adhere firmly to the object on which they are deposited. 



Larva. Length 2 inches. Head a dull reddish or yellowish 

 brown, the thoracic shield darker and distinctly fuscous along the 

 margins. The body mostly a dull brownish black, the suranal 

 plate and anal prolegs yellowish brown. There are irregular, 

 yellowish markings along the sublateral lines, they being repre- 

 sented by inconspicuous dots on the second and third thoracic 

 segments. On the first abdominal segment these markings are 

 so thick and contiguous in some specimens as to give the appear- 

 ance of short, sublateral lines extending most of the length of 

 the segment. On the third abdominal segment the yellowish mark- 

 ings are distinctly produced laterally and towards the median line, 

 forming a pair of submedian irregularly oval, reddish yellow marks, 

 very suggestive of tubercles. On the remaining segments this sub- 

 lateral marking is indicated only by inconspicuous dots, a pair on 

 the anterior and posterior annulets of each segment, the yellow 

 markings becoming a little thicker and more irregular on the nth, 

 1 2th and 13th segments. Head distinctly broader anteriorly, the 

 clypeus sunken, yellowish brown, the labrum pale yellowish with 



