334 AMERICAN MICRO-LEP1DOPTERA. 



the apical dusting, and sometimes the costal streaks are faintly dark margined. 

 The abdomen and legs are very pale golden varied with white. Alar expanse 

 one-fourth to nearly one-third inch." 



The larvse form irregular blotch mines on the upper side of leaves 

 of elms, Ulmus fulva Michx. and Ulmus Americana L. The pupa 

 of the summer brood is formed under a flat silken cocoon. A later 

 hibernating brood changes from the usual green color to a pale yel- 

 low color, and passes the winter in silk lined chambers. 



The expanse of the imago does not vary as greatly as would 

 appear from Mr. Chambers' measurements, being 6.5-7 mm. The 

 original description, printed above, is accurate in all other details, 

 except that the second costal streak is often more than " faintly 

 dark margined " behind. 



Although resembling L. conglomeratella Zell. very closely, it may 

 be distinguished from it by the uniformly smaller size, paler ground 

 color of the wings, slightly more oblique position of the costal 

 streaks, the absence of the tuft of scales in the apical cilia and 

 especially by the antennae. In ulmella the apical two- thirds only 

 are annulate with brown, while in conglomeratella the annulations 

 are always present for the whole length, although sometimes indis- 

 tinct toward the base. 



Lithocolletis quercivorella Chambers. 



Plate XXIII, Fig. 18. 



Lithocolletis quercivorella Chambers, Can. Ent., xi, 145, 1879. Walsingham, Ins. 

 Life, ii, 24, 1889. Dyar, Bull. 52, U. S. Nat. Mus., 1902, No. 6296. 



Face, palpi, tuft and antennae silvery white; sides of the tuft reddish orange ; 

 each joint of the antennae spotted above with dark brown, the spots becoming 

 small and indistinct toward the base. Thorax and forewings golden ; a median 

 white streak on the thorax is continuous with a dorso-basal white streak on the 

 forewing, which extends slightly beyond the middle of the dorsal margin. Its 

 end is usually bordered with two or three fuscous scales. There are three costal 

 white streaks, of which the first two are oblique. The first at one-third is dark 

 margined behind and sometimes on the costa before ; the second at the middle 

 of the wing length is dark margined behind and around the tip, and the dark 

 scales are produced backward for a short distance. The third is a spot before 

 the cilia dark margined on both sides. Opposite this is an oblique dorsal streak 

 densely margined with blackish scales behind, the dark margin passing into the 

 dusted apical part of the wing. Cilia silvery ocherous; hinder marginal line 

 dark brown. Expanse 6.5-7 mm. 



Hindwings silvery ocherous, cilia concolorous. Abdomen pale yellow. Legs 

 whitish, shaded with ocherous. In the original description Mr. Chambers says 

 " tarsi annulate with black." The fore and middle tarsi are always annulate 

 with black, but more often the hind tarsi are silvery white. 



