LOCUST LEAF-MINERS. 363 



Larva. — Length when full grown, 14'">", cylindrical, slightly fusiform. Head and 

 thoracic plate very pale honey yellow, the rest of the body 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 th& 

 body, each one being surmounted by a brownish hair. Spiracles green with a brown 

 ring. 



Pupa. — Length, S""". Color, dark shining brown, lighter at the end of the wing- 

 covers and the parts covering the palpi and base of the antennje. 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-shaped purplish red 

 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 j 

 the hind wings pale slate, whitish towards the base. 



7. The lesser locust-leaf gelechia. 



Gelechia robin iwfoliella Chambers. 



Spinning two locust leaves together and feeding between them, leaving the outer 

 surface and the larger ribs untouched, a miuute, 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. 



LithocoUetis 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 LithocoUetis 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 larvte 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. 



