320 PROCEEDINGS OF THE ACADEMY OF 



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 und 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 p s e u d-a c a c i a) 

 the separated epidermis of which is conspicuously white. It may be found in 

 the latter part of September and the beginning of October. The pupa is con- 

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

 latter part of October, and 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 Amphicarpaea 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 dorsal 

 spot rather nearer the base than the first costal spot and exterior to the dark- 

 margin, it is silvery, dusted with blackish ; the second costal spot is not as dis- 

 tinctly angled in the middle and the apical spot is larger ; in some specimens 

 there are two dorsal white lines on the thorax. The general resemblance be- 

 tween the two is so marked that I consider it unnecessary to designate it as a 

 variety, for it is undoubtedly, I think, the same insect. 



With a single subcosto-marginal nervule. 



3. L. Des modi e 11a. Antennse dark brown, tipped with a silvery hue 

 Front whitish, with a ruby-colored lustre ; frontal tuft dark brown. Thorax 

 with a splendent ruby hue. Fore wings ferruginous brown, ruby-tinted at the 

 base, with two silvery bands dark-margined on both sides, one near the base 

 and one in the middle of the wing. A costal and dorsal silvery spot near the 

 tip, opposite to each other, and a costal silvery spot just before the tip, the two 

 former dark-margined on both sides, and the latter slightly dark-margined. 

 No hinder marginal line ; the cilia opposite the last dorsal spot blackish, and 

 the wing beneath the last costal spot golden-brown. Hind wings pale brown- 

 ish gray, cilia the same. 



The larva may be found in the leaf of Desmodium viridiflorumin July 

 and early in August ; it mines the under surface, usually near the margin, which 

 is more or less folded, and the separated epidermis brown and hairy. I have 

 no description of the larva. It becomes a pupa during the latter part of August, 

 and is suspended within the mine in a very slight web of silk. The perfect 

 insect is the smallest of this group that has come under my observation. 



4. L. iEriferella. Antennse dark brown above, white beneath. Front 

 silvery white ; tuft dark brown. Fore wings pale reddish-saffron with a golden 

 hue, especially from the middle to the base, with four silvery costal streaks, 

 the first on the middle of the costa, and all except the last black-margined to- 

 ward the base, the third but faintly, and the costa black from the base to the 

 first costal streak. Three silvery dorsal streaks on the inner margin, the first 

 two large and the third small, the first black-margined internally and around 

 the tip behind, the second by a line curved above. Apical spot small and 

 black, with the scales behind it having a bluish splendent lustre ; hinder mar- 

 ginal line blackish ; cilia dark grayish, with a fulvous hue. Hind wings dark 

 gray, cilia fulvous. 



The larva may be found in the leaves of oaks in September and early in Octo- 



[Nov. 



