(LITHOCOLLETIS) NOVEMBER, 1859. 67 



white, toft dark brown, mixed with grayish. Thorax dark 

 brown. Fore-wings golden-yellow above the fold, and dark 

 cinereous, somewhat dusted with blackish, beneath it. About 

 the middle of the wing is an oblique, silvery costal streak, 

 black-margined on both sides, extending to the fold; another 

 beyond the middle, meeting nearly in the centre of the wing 

 at an angle, a dorsal streak from the inner margin, the former 

 black-margined on both sides, the latter internally ; another 

 costal streak near the tip with an internal circular black 

 margin opposite to a dorsal streak of the same hue and joined 

 or nearly joined to it. Just behind the apical spot is a straight 

 silvery streak, black-margined internally. Between the first 

 and second dorsal streaks is a short black streak in the fold. 

 Apical spot black and round, with a hinder-marginal blackish 

 line in the cilia; cilia grayish. Hind-wings shining dark 

 gray, cilia the same. 



The larva mines the underside of the locust leaf (Robinia 

 pseud-acacia), the separated epidermis of which is conspi- 

 cuously white. It may be found in the latter part of Sep- 

 tember and the beginning of October. The pupa is contained 

 in a white silken cocoon within the mine. The imago appears 

 in the latter part of October or early in November. I have 

 not found a spring or summer brood in the leaf of the locust. 

 .The larva is cylindrical ; the head pale brown ; the body pale 

 greenish-white, with a red vascular line from the 5th to the 

 9th segment ; on the 9th segment are two irregular patches, 

 chrome yellow ; sometimes these patches are wanting. 



The under side of the leaf of Amphicarp&a monoica is 

 also mined by a larva, which I believe is the same as that in 

 the leaf of the locust. It may be found in the beginning of 

 September, the imago in October. The imago differs very 

 slightly from Robiniella, and I have no note of any difference 

 in the larval state, and, like Robiniella, it weaves a white 

 silken cocoon within its mine. The perfect insect differs 

 from the foregoing species in the following respects : the 

 wing beneath the fold is blackish at the base, with a silvery 



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