ANNETTE F. BRAUN 
189 
not silvery, usually meets tlie ajiex of a shorter, broader dorsal streak. The 
tips only of the last row of scales around the aj)ex are dark, thus forming a dark 
line in the white cilia. Hind wings gray; in the male with a narrow chitinoiis 
plate from base to one-third of costa, with a long yellowish costal hair-pencil 
lying along it. Legs and abdomen fuscous above, silvery beneath, with yellow 
anal tuft in the male. 
Expanse . — 5 to 6 mm. 
Localities. — Cincinnati, Ohio; Powell County, Kentuckjy 
Type material. — Holotype (writer’s collection); paratype (Acad. 
Nat. Sci. Phila.); eight paratypes (writer’s collection). 
Ten specimens, bred from larvae mining leaves of pin oak 
((}uercus pahistris) in a single isolated locality east of Cincinnati; 
I have also observed a few mines on chestnut in Kentucky. The 
egg is placed on the upper side of the leaf. The early jjortion of 
the characteristic mine (Fig. 27) is very narrow, completely 
filled with frass, and bent several times in close S-shaped curves; 
the larva next mines just above the lower epidermis, forming a 
blotch scarcely visible above except for occasional spots here and 
there toward the edges of the blotch, where the leaf substance is 
more fully consumed; then a conspicuous large blotch is formed 
where the mine is transparent and whitish, with frass accumulated 
toward the beginning of the blotch. Larva pale green; cocoon 
ochraceous. 
Females of this species can only be distinguished from those of 
X. platanella bj' the less sliining costal and dorsal spots; males 
differ in the yellowish costal hair-pencil of the hind wings. 
41. Xepticula thoracealbella Chambers 
A'epticula thoracealbella Chambers, Can. Ent., v, 127, 1S73; Dyar’s No. 6222. 
Sj’n. hadiocapilella Chambers, Can. Ent., viii, 160, 1876; D\-ar’s No. 6186. 
Tuft ochraceous on the face, liecoming reddish brown on the vertex; ej'e- 
caps white. Thorax white, occasionally with a few scattered dark brown scales. 
Fore wings dark brown, slightly irrorated; a creamy white irregular fascia 
just before the middle concave tow ard the base and usually wider on the dorsal 
margin; at the apical fourth a distinct creamy wdiite costal spot and an op- 
posite dorsal spot, whose apices occasionally touch; cilia creamy white, some- 
times grayish on the dorsum. Hind wings pale gray, cilia whitish. Legs 
creamy wdiite, wdth outer surfaces of hind legs fuscous. Abdomen graj' above, 
silvery beneath, wdth yellow anal tuft. 
Expanse . — ^4 to 5 mm. 
Localities . — Kentucky (Chainl)ers); Ohio; Allegheny County, 
Pennsylvania (iMarloff). 
TRANS. AM. ENT. SOC., XLIII. 
