(LITHOCOLLETIS) NOVEMBER, 1859. 75 



counted twelve. The " frass" is deposited along the middle 

 of the mine. The larva is flattened and its physical cha- 

 racteristics are similar to those of the second larval group. 

 The head is very light brown; the body dark lead colour, 

 becoming yellowish posteriorly, with the mammillae of the 

 thoracic rings yellowish, and a central spot of the same hue 

 on the first; each ring on the dorsum with a dark brown, 

 shining macula, those on thoracic rings trapezoidal, the re- 

 mainder oval ; on the ventral surface the maculse are also 

 dark brown, those on the fourth and fifth rings being oval. 

 The perfect insects of the spring brood appear in August ; 

 from the fall brood I did not succeed in rearing the imago. 



12. L. aceriella. Front silvery, tuft reddish-orange and 

 silvery mixed. Thorax reddish-orange. Fore-wings reddish- 

 orange, somewhat metallic, with a white streak black-margined 

 exteriorly, from the inner basal angle to the fold; with two 

 oblique silvery bands black-margined behind, one about the 

 middle of the wing and the other midway between it and the 

 base of the wing. Near the tip is a costal silvery spot, black- 

 margined behind, with an opposite, oblique, dorsal streak of 

 the same hue, likewise black-margined behind, and an oblique, 

 costal, silvery streak continued an the line of the last dorsal, 

 running into the cilia just before the tip, black-margined 

 above, at the tip before, and below at the tip behind ; scarcely 

 with a hinder-marginal line, cilia of the general hue. Hind- 

 wings plumbeous, cilia with a fulvous hue. 



The larva mines the leaf of maple in September. It mines 

 the upper surface, of the leaf, making a flat, rather broad 

 tract, casting its fe frass" along the middle of the course of it. 

 Physical characteristics those of the second larval group. 

 Head pale brown; body yellowish-green, with oval, dorsal, 

 brown maculae, darkest on their margins; thoracic rings on 

 their sides pale yellowish. The cocoon is circular. The 

 larva is likewise found in the leaf of Hamamelis Virginica 

 (witch-hazel). 



