346 AMERICAN MICRO-LEPIDOPTERA. 



Liithocolletis aceriella Clemens. 

 Plate XXIV, Fig. 11. 

 Lithocollelis aceriella Clemens, Proc. Acad. Nat. Sci. Phil., 325, 1859. — Tin. No. 

 Am., 65, 75, 1872.— Busck, Proc. Ent. Soc. Wash., v, 189, 1903.— Dyar, 

 Bull. 52, U. S. Nat. Mus., 1902, No. 6305. 



"Front silvery, tuft reddish orange and silvery mixed. Thorax reddish 

 orange. Forewings 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, oblifjue dorsal streak 

 of the same hue. likewise black margined behind, and an oblique costal silvery 

 streak continued on 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. Hindwings plum- 

 beous, 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 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 maeulie, darkest 

 on their margins; thoracic rings on their sides pale yellowish. The cocoon is 

 circular." 



The above is Clemens' description and represents the typical 

 eastern form of the species. Specimens occur in which the white 

 streak at the base of the dorsal margin is replaced by a pale ocher- 

 ous shade, bordered externally by brown scales. The dorsal streak 

 above the cilia is also very variable, being in some specimens almost 

 erect, while in others it is oblique and parallel to the termen. The 

 usual expanse is about 7 mm., but specimens collected at Ottawa, 

 Canada, by Mr. C. H. Young expand 8-9 mm. In these specimens 

 the pale streak at the base of the wings is scarcely lighter than the 



ground color. 



The mine is common throughout 

 the Atlantic States on leaves of 

 red maple, Acer rubrum L., but is 

 rarely found upon sugar maple. 

 The larvse appearing in July pu- 

 pate in a silken lined chamber, 

 and do not spin the usual flat 



Mine of L. aceriella. .,, 



silken cocoon. 

 The insect to which Chambers refers in Can. Ent., iii, 130, 1871, 

 is not 1j. aceriella Clem, but the species described under the name 

 saccharella by the writer. 



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