NOVEMBER, 1861. 175 



serotina, during the latter part of July and early in August. 

 It is more or less blotchy in the beginning, with frass dis- 

 persed and towards the end gathered into a rather broad line, 

 with the grains distinct. I have never found them tenanted, 

 and it is quite possible that they are the work of Dipterons 

 larvae. The mines are reddish-brown after the larvae leave 

 them. 



11. JV. anguinella. May be found in the leaves of oaks 

 early in October and in the latter part of June. The mine 

 is a very narrow serpentine tract, which is filled or dis- 

 coloured throughout its length by blackish excrement. The 

 larva fits the mine closely, in colour lemon-yellow, with ten 

 square dark brown or blackish spots on the ventral surface. 



Other mines in the same leaves have, sometimes, a broad 

 frass line, sprinkled along the middle and often it begins as 

 a slender line, and these doubtless all belong to the same 

 species. 



12. N. platea. Mines oaks early in October. The mine 

 is a moderately broad, winding tract, with a broad line of 

 dispersed grains of excrement. The larva is purplish, with 

 a pale-green vascular line and a row of reddish-brown dorsal 

 dashes. The mine is much broader than that of the preceding 

 miner. 



13. N. saginella. Mines oaks early in October. I have 

 found the larva abundant in the leaves of chestnut early in 

 August. The larva makes a transparent, moderately broad, 

 serpentine tract, gradually increasing in breadth from the 

 beginning to the end, where it is very slightly enlarged, with 

 a central black frass line. It is about a line wide towards 

 the larger end, and from twelve to fifteen lines long. In the 

 leaves of chestnut the mine is often made along the edge of 

 one of the coarse pointed teeth, running up to the point, 

 whence the enlarged portion is turned inwards. In this leaf 

 the mines are only twelve lines long. 



