1919] T raver — Lepidopterous Genus Depressaria 73 



None were observed May 31. Oviposition continued to June 8, 

 p. m., at the latest, and the total number counted was 99 — 51 up 

 to June 2, a.m., 41 between 2, a.m. and 4, p.m., 7 between 4, p.m. 

 and 8, p. m. They were laid on the less compact or looser surface 

 of the felt, and some were placed quite deeply among the loose 

 fibers. Evidently they are not always placed singly, for in one 

 instance a group of four was found, and several occurred in pairs. 

 The moth died the evening of June 9. The eggs (infertile in this 

 case) were white to the unaided eye and under an ordinary hand 

 lens, but practically colorless when magnified more highly; oval to 

 ovoid in shape, but a few were somewhat reniform, resembling a 

 type of bean; surface somewhat roughened, marked with nearly 

 spherical, squarish, or elongate shallow depressions, with very 

 narrow intervening ridges. Whether the roughened surface, and 

 the subreniform shape, was due to the age of the eggs — for on 

 June 9, when they were examined, a large proportion had already 

 collapsed — the writer cannot say, although, he might state, it 

 did not appear so. Eighteen were measured and were found to 

 be .49 to .66 mm. long and .27 to .34 mm. wide. The longest were 

 generally the broadest. 



The present record, it might be added, adds to the accumulating 

 evidence, seemingly, that this species rather than Tinea pellioneUa 

 Linn, (the case-making moth) is the more common species in the 

 North. 



How is the marked difference in degree of activity and sensitivity 

 manifested by the larvae to be explained? Is it a matter of indi- 

 viduality? Or, in view of the resulting difference in sex, is it a 

 matter of sex? 



ECOLOGICAL RELATIONS OF THE LEPIDOPTEROUS 

 GENUS DEPRESSARIA ((ECOPHORID.E). 



By Miss Jay R. Traver, 

 Department of Entomology, Cornell University. 



The members of a group of animals or plants, closely allied to one 

 another in a systematic sense, may yet differ rather widely in their 

 habits of life. While fitted for the same general type of environ- 

 ment, they nevertheless show considerable variation in their adap- 



