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ENIGMAS STILL UNANSWERED. 



7. " A Gelechia ? larva on oak, forming an entire leaf into 

 a vaulted chamber." Is not this Phoxopteryx subuncana ? 



11. " An Elachista larva, found by Mr. Scott at the end 

 of April, mining in leaves of Scirjms lacastris." This has 

 not again been met with. 



18. " A Lithocolletis larva mining the upper side of birch 

 leaves," This has not again been met with. 



20. " A Depresmria larva found by Mr. Boyd, May 2nd, 

 1855 (it was then young), feeding on a leaf of parsnip (Pas- 

 tinaca sativa) under a turned-down corner ; this was expected 

 to be Depressaria Douglasella" It has not again been 

 met with. 



22. "A singular mine on alder leaves." These I have 

 collected rather freely this year, so hope to solve the diffi- 

 culty next season. The habit of this larva is so very peculiar 

 that it deserves special notice. The larva commences to mine 

 near the midrib, and mines along a lateral rib for a short 

 distance ; it then crosses over from one lateral rib to another, 

 and in so doing makes a very slight but visible track. 

 This is the track to be looked for when collecting the larva ; 

 for, as soon as it reaches the next lateral rib, it mines along it 

 to the midrib, and then mines down the midrib for an inch 

 or more, all which time the larva and track are both com- 

 pletely concealed in the thickness of the rib j the larva then 

 turns round and mines up the midrib to about the place 



