LOCUST LEAF-MINERS 365 
gray, and of the same color beneath, while the legs are of a very pale straw-yellow. 
It differs from most of the species of the genus in having the apex of the fore-wings 
less rounded than usual, and in this and other respects it is allied to the European 
D. laterella. 
10. The locust leaf-miner. 
Gracillaria robiniella (Fitch). 
Order Lepidoptera; family Tineid^e. 
Mining the leaf in July, making a blotch on the upper surface of the leaf, with a 
number of lateral galleries running out from it, on each side, a flattened pale green 
worm which passes the chrysalis state in the leaf, the latter falling to the ground, and 
the following June giving out a minute moth. 
This is a common leaf-miner of the locust in the New England a& 
well as the Middle States. Out of the seventeen leaflets which form 
the locust leaf, usually two or three and often more make the blotches. 
The mines are not tenanted, Clemens states, at the time the leaf is- 
mined by Lithocolletis robiniella (Clem., Proc. Phil. Acad., 1860). 
The larva makes a pale yellowish mine, usually on the midrib, with 
lateral branches running out from it. It pupates in a small nidus on 
some object on the ground. 
The late Mr. Chambers wrote me that it is common in New Orleans 
in February. 
The moth. — Fore-wings fine brown, somewhat golden, shaded with dark brown. 
Along the costa are three oblique silvery streaks ; on the inner margin are three sil- 
very dorsal spots, placed opposite the spaces between the costal streaks. Near the 
tip of the wing is a transverse narrow curved silvery line, passing from the costa to> 
the inner angle. (Clemens.) 
11. The locust skipper. 
Eudamus tityrus Fabricius. 
Drawing the leaves together in July, a large pale-green caterpillar about 2 inches 
long, with a red neck and large red head, with a large yellow spot on each side of 
the mouth, feeding by night, sometimes pupating between the leaves, and transform- 
ing into a stout-bodied, brown butterfly with a skipping, rapid, strong, low flight, 
and antennae flattened and bent over at the end. (Harris.) 
These voracious worms sometimes strip the leaves of the common 
locust and especially the viscid locust (Robinia viscosa), which is culti- 
vated in New England as an ornamental tree. According to Harris, 
the females lay their eggs singly during June or early in July on the 
leavea, the caterpillars hatch in July, and when quite small conceal 
themselves under a fold of the edge of a leaf, which is bent over their 
bodies and secured by means of silken threads. When they become 
larger they attach two or more leaves together, so as to form a kind of 
cocoon or leafy case to shelter them from the weather, and to screen 
them from the prying eyes of birds. One end of the leafy case is left 
open, and from this the insect comes forth to feed. They transform to 
