304 AMERICAN MICRO-LEPIDOPTERA. 



dorsal are opposite each other, the costal one being the largest of the two, trian- 

 gular and dark margined before. The third costal and third dorsal are nearly 

 opposite, the costal being perhaps a little farther back, and being larger than the 

 dorsal, and larger also than the second costal ; both are dark margined before. 

 These are the only three dorsal streaks. The fourth costal is just before the 

 apex, points a little obliquely forward, and is margined behind by a small apical 

 patch of brown dusting. Cilia white, with a brownish hinder marginal line at 

 their base. Alar expansion one-fourth of an inch. Ohio and Kentucky." 



The above is Chambers' original description. The second and 

 third costal streaks can scarcely be said to be larger than their cor- 

 responding dorsal streaks; usually they are about the same size. 

 There is also some variation in the amount of apical brown dusting ; 

 sometimes it only consists of two or three scales. The expanse is 

 6-7 mm. 



I have bred this species from tentiform mines on the underside of 

 the leaves of the silver leaf poplar, Populus alba L., the same food 

 plant from which Chambers bred this species. The mines are ex- 

 ceedingly small, oval, 9-10 mm. long, and 4-5 mm. broad ; an indis- 

 tinct fold extends through the long axis. They are scarcely visible 

 on the lower side, owing to the peculiar tomentose texture of the 

 leaf, and on the upperside may be distinguished by the speckled 

 appearance of the leaf, caused by the larva eating the parenchyma 

 in spots. The pupa is not enclosed in a cocoon, but its anal end is 

 attached to a small button of silk toward one end of the roof of 

 the mine. 



Lithocolletis sexnotella Chambers. 



Plate XXII, Fig. 12. 



Lithocolletis sexnotella Chambers, Jn. Cin. Soc. Nat. Hist., ii, 189, 1879. Dyar, 

 Bull. 52, U. S. Nat. Mus., 1902, No. 6282. 



Face and palpi white; antennae whitish, darker at the tips; tuft very pale 

 golden. 



Thorax and forewings very pale golden. Four costal and three dorsal white 

 streaks (the third dorsal obscure and sometimes wanting); of these the first two 

 pair are dark margined internally, the first dorsal also faintly around the tip. 

 First costal very oblique, small and opposite the large curved first dorsal. Sec- 

 ond dorsal opposite the space between the second and third costal streaks. A 

 small dark brown apical spot. Marginal line at the base of the cilia brownish, 

 with a pale blue metallic luster. Cilia whitish, slightly tinged with golden. 

 Alar expanse 7-7.5 mm. 



Hiudwings and cilia pale yellowish. Abdomen above ocherous in the female, 

 gray in the male, beneath whitish. Legs yellowish white, tarsi unspotted. 



This species was described by Chambers from a Kentucky speci- 

 men, and the type is deposited in the Museum of Comparative 



