312 AMERICAN MICRO-LEPIDOPTERA. 



Antennae dark brown. Face and palpi silvery white, with a purplish and 

 golden iridescent lustre. Tuft small, dark brown. Ground color of the thorax 

 and forewings brilliant golden brown ; that of the thorax a shade darker. Two 

 silvery fascise, margined internally with dark brown ; and beyond them two pair 

 of opposite streaks, also internally dark margined, of which the first pair some- 

 times unite to form an interrupted fascia. The basal fourth of the wing is dark 

 brown, more golden below the fold toward the base. The first fascia is at the 

 basal fourth, and shades gradually into the ground color of the wing. It is fol- 

 lowed at about the middle by a second similar fascia. At the beginning of the 

 costal cilia is a silvery spot, and opposite it a larger dorsal spot. At the apical 

 fifth is a similar costal spot, and opposite it a small dorsal one. Marginal scales 

 at the base of the apical cilia dark brown. Cilia silvery gray. Expanse 5.5-6 mm. 



Hindwings and cilia gray. Abdomen dark gray, with a purplish golden lustre. 

 Legs gray. 



The mine is a yellow blotch, occurring upon either the upper or 

 lower surface of leaves of Robinia pseudacacia L. and Robinia his- 

 pida L. The leaf is but slightly contracted and the larva is some- 

 what more flattened than is usual in the cylindrical group. The 

 larva leaves the mine to pupate, spinning a flat, oval, yellowish 

 brown, silken cocoon. 



The species is abundant wherever its food plant occurs. 



Lithocolletis tritieiiiaiiella Chambers. 



Plate XXII, Fig. 22. 



Lithocolletis tritsenianella Chambers, Can. Ent., iii, 110, 184, 1871; v, 48, 1873; xi, 

 89, 1879. Walsingham, Ins. Life, ii, 53, 1889. tritseniella Dyar, Bull. 

 52, U. S. Nat. Mus., 1902, No. 6316. 



Syn. consimilella Frey and Boll, Stett. ent. Zeit., xxxiv, 214, 1873. Chambers, 

 Cin. Quart. Jn. Sci., i, 202, 1874; ii, 230. 1875. Walsingham, Ins. Life, 

 ii, 51, 1889. 



Face and palpi white; antennae white, annulate with fuscous above ; tuft saf- 

 fron, mixed with a few brownish scales. 



Thorax and forewings pale reddish saffron. Three white fasciae, each narrowly 

 margined internally with dark brown scales ; the first at about the basal fourth, 

 the second near the middle. The third midway between the second and the 

 apex, is the narrowest and is slightly angulated in the middle. An indistinct 

 oblique whitish costal streak near the apex. Apex slightly dusted with brown 

 mixed with a few white scales. Cilia slightly paler than the ground color. Ex- 

 panse 7-8 mm. 



Hindwings and cilia gray. Abdomen reddish brown. Legs and tarsi whitish ; 

 tarsi slightly tipped with black. 



The larvae form rather large tent mines on the upper side of 

 Ostrya Virginiana (Mill.) Willd. At first the mine is a flat blotch, 

 and the loosened epidermis is white, sparsely speckled with brown. 

 Later, by contraction of the epidermis, the mine becomes roomy 



