LOCUST LEAF-MINERS. 363 
Larva. — Length when full grown, 14 mm , cylindrical, slightly fusiform. Head and 
thoracic plate very pale honey yellow, the rest of the hody yellowish green with the 
alimentary canal showing dark green through the dorsum. Eyes, third joint of 
antennae, and tarsi, blackish. Piliferous tubercles slightly paler than the rest of the 
body, each one being surmounted bpa brownish hair. Spiracles green with a brown 
ring. 
Pupa. — Length, 6 mm . Color, dark shining brown, lighter at the end of the wing- 
covers and the parts covering the palpi and base of the antennae. Front rounded 
and smooth. Abdominal segments on the dorsal side armed with two transverse 
rows of small spines inclined backward, those on the posterior edge of each segment 
finer and closer than those of the other row. Abdomen terminated by a protuber- 
ance, flattened above, rounded at the end, hollowed out underneath near the base, 
and armed with two fine hooks on each side, and four from the end. (Comstock.) 
Moth. — Of a bright sulphur or golden yellow color, with a Y* 8 h a P e d purplish reel 
mark across each fore-wing, and more or less of the same color'along the front or cos- 
tal and outer border. Hind wings varying from light yellowish to brown. Expanse 
of fore-wings, half an inch or a little more. 
6. The greater locust-leaf gelechia. 
Gelechia pseudacaciella Chambers. 
Order Lepidoptera ; family Tineid^e. 
From eggs laid on the under surface of the leaf hatches a green larva with a reddish 
head and thoracic plate, and six longitudinal dusky stripes ; spinning a slight web 
between two leaves; changing to a moth in late spring, whose wings expand 0.63 
inch. It is somber in color, the fore-wings dark slate, flecked with brown and white; 
the hind wings pale slate, whitish towards the base. 
7. The lesser locust-leaf gelechia. 
Gelechia robinicefoliella Chambers. 
Spinning two locust leaves together and feeding between them, leaving the outer 
surface aud the larger ribs untouched, a minute, greenish white slender larva, which, 
transforms to a chrysalis in the same situation, the moth differing from its closely 
allied species in the palpi being slender and rather long, while the hind wings are 
emarginate beneath the apex. (Comstock and Chambers.) 
8. The autumnal locust leaf-miner. 
Lithocolletis robiniella Clemens. 
Mining the under side of the locust leaf late in September and early in October (in 
the Middle States) a cylindrical larva, with a pale brown head and the body greenish 
white, sometimes spotted with yellow ; the chrysalis contained in a white silken 
cocoon within the mine, and transforming late in October and early in November 
into a minute moth with narrow pointed fore-wings, which are golden yellow along 
the costal edge and with a spot at the tip. 
The species of Lithocolletis are known by their small size, the nar- 
row, pointed fore- wings, the tuft on the top of the head, and the simple, 
not ciliated, antennae. The larvae mine the upper and under side of 
leaves and usually transform within a silken cocoon in their burrows. 
The present species is one of the best known of the genus. 
