32 



■side is pale dull green. It does not attain to the size of 

 the tobacco worm, fully grown examples measuring only 

 2.25-2.50 inches in length as against tlio 4.00 inches or 

 more of the other. 



Unlike the tobacco-worm it appears only locally and 

 at irregular periods. But when it does come its voracity 

 is so great and its numbers so large that infested trees 

 are in the course of a week or two completely denuded 

 of leaves. 



Daring the past summer a few trees on the College 

 grounds at Lexington were very badly injured, but other 

 trees of the same species only a short distance from those 

 attacked were untouched. The fact was the more notice- 

 able because there were several broods of worms during 

 the summer, and since the adult moth flies well there 

 was no apparent reason why it should not have dis- 

 tributed its eggs on more of the trees. If this had been 

 done, however, every tree on the grounds would have 

 lost its leaves before fall, and hence we may suppose the 

 habit of scattering over a wide area after emerging from 

 the ground, instead of placing their eggs at once on 

 trees about them, to be an arrangement for protecting 

 the worms from their own destructiveness. 



The worms leave the trees as suddenly as they appear, 

 all going into the ground for pupation about the same 

 time. The pupa closely resembles the brown objects 

 with structure at one side like the handle of a pitcher 

 which we find in gardens in spring. This latter is the 

 pupa of the tobacco or tomato-worm. The pupa of the 

 ■catalpa sphinx has the same general shape, but lacks the 

 tongue-case. It varies in length from 1.28 to 1.56 inch. 

 The color is bright fulvus (yellowish brown), with an 

 obscure dark stripe along the middle of the back . The 

 body tapers somewhat towards the extremities, termin- 

 ating behind in a short spine, and in front being 



