400 Report of the Department of Exto.mology of the 



by him young larvae of malinellus taken from apple subsisted equally 

 well on plum foliage and mined the leaves, as is their normal habit 

 on their favorite host. The opinion of Schoyen that padellus is 

 the common species on apples in Norway and the observation by 

 Bos of padellus migrating from Crataegus to apple trees have already 

 been mentioned. 



The differences noted by Rebate in the appearances of the larvae 

 and cocoons of padellus as reared on plums in comparison with these 

 stages of malinellus bred on apple are as follows : — The caterpillar 

 of the former species is of a yellowish-grey color. The cocoons 

 are thin in texture, of a greyish-white color and more or less detached 

 from one another in the tent, while the caterpillars of the latter 

 species are lighter in color and a little shorter and more slender. 

 The cocoons are white, more dense and compact, and are attached 

 one to another forming clusters or packets which vary in size accord- 

 ing to the numbers of the caterpillars in the colony. Theobald 

 observes similar differences in the cocoons and adds that the nest or 

 tent is likewise not nearly as compact with padellus as with the 

 apple-feeding species. 



COMPARISONS OF COLLECTIONS OF padellus AND malinellus. 



Bearing in mind the foregoing distinctions it is now of interest 

 to compare collections of these insects from various geographical 

 areas to note the range of variation and the forms that are in the 

 region of their occurrence understood as constituting padellus and 

 malinellus respectively. There is also included in this comparison 

 the material bred from apple and cherry in New York. 



Padellus. 

 Habitat,' Germany. 

 Host plant, hawthorn. 

 Moth, primaries, including fringe, 



clouded and dark. Expanse of wings 



22 to 23 mm. 



Larva, dark olive-green with dorsal spots 

 rather indistinct. Length 15 to 17 mm. 



Pupa, head, wing pads and tip of abdomen 

 dark brown or black and remainder of 

 body yellow. Length 7 to 9 mm. 



Cocoon, greyish-white, thin and pupa 

 visible. 



Habitat,^ France. 

 Host plant, hawthorn. 



Malinellris. 



Habitat,^ Germany. 



Host plant, apple. 



Moth, primaries entirely white or white 

 with exception of fringe which may 

 be slightly clouded. Expanse of wings 

 19 to 20 mm. 



Larva, pale, dirty white or greenish- 

 yellow with dorsal spots distinct. 

 Length 10 to 12 mm. 



Pupa, pale or brown. Length 6 to 8 mm. 



Cocoon, white, densely woven, and con- 

 cealing pupa. 



Habitat,^ France. 

 Host plant, apple. 



^ Collection, 2 adults, 3 larvae and 12 pupae from Dr. L. Reh, Hamburg, Germany. 



* Collection, 7 adults, 3 larvae and 4 pupae from Dr. L. Reh, Hamburg, Germany. 

 ' Collection, 2 adults, 4 larvae and 3 pupae from M. J. de Joannis, Paris, France. 



* Collection, 17 adults, 3 larvae and 5 pupae from M. J. de Joannis, Paris, France. 



