ENIGMAS STILL UNANSWERED. 133 



where it had entered it ; there it quits the shelter of the rib, and 

 .makes a broad flat mine in the leaf, and, as soon as this mine 

 is big enough, it cuts out an oval case like Tinea bistrigella, 

 and descends to the ground. But in the alder feeder the 

 blotch, being so much smaller, is all or nearly all used up to 

 form the case ; so that in the deserted leaves we see the hole, 

 and the track between the two lateral ribs, but nothing more. 

 If there is no hole, but yet this tell-tale track, the larva, 

 though completely invisible, is still within the leaf! 



NEW ENIGMAS FOR SOLUTION. 



25. A N&pticula larva mining the leaves of Vaccinium 

 Myrtillus in October and November. The mine is rather 

 broad and considerably contorted. The larva when full fed 

 quits the leaf. I first received this from Herr Schmid of 

 Frankfort, and a few weeks afterwards Mr. Edleston sent it 

 me from the neighbourhood of Manchester. 



26. A Nepticula larva mining the leaves of birch ; the 

 mine has some resemblance to that of Nep. luteella, but the 

 central track of excrement is broader, not so mathematically 

 linear. " Mine contorted, at first nearly filled up with black 

 excrement, then with a broadish central track of dark green 

 excrement, leaving a whitish margin on each side." 



27. A Gtlechia ? larva feeding in the heads of yarrow 

 (Achillea millefolium) among the seeds. I met with this 



