Vol. XXXl] ENTOMOLOGICAL NE\\ 'S 79 



ta pupation much as in Coptotriche. Mines received early in 

 May produced imagoes during the latter half of that month. 

 This species is similar to T. badiiella in distribution of dark 

 dusting, but the ground color is deeper and the base of the 

 costa of the hind wing of the male is not thickened with dark 

 fuscous scales as in that species. 



Coptodisca negligens n. sp. 



Face and head pale leaden metallic; antennae blackish. 



Thorax and basal half of fore wings pale leaden metallic; apical half or 

 more of wing bright orange yellow; the silvery costal and dorsal streaks 

 at the apical third nearly opposite, of about equal size, their apices usually 

 separated by the yellow ground color, rarely with their internal dark mar- 

 gins confluent. The outer dark margin of the dorsal spot forms part of 

 the dark patch of scales which extends from it to the dorsum and termen, 

 but is separated from the costal streak and apical dark patch by the orange 

 yellow color. A perpendicular dark streak in the costal cilia beyond the 

 costal silvery streak. Apical dark patch preceded by a minute silvery 

 spot and broadly bordered on either side with silvery scales; from it a 

 black pencil extends into the apical pale gray cilia. Hind wings gray. 



Legs silvery gray, tarsi fuscous. Expanse: 4-4.5 mm. 



The type series, consisting of 55 specimens, was reared from 

 mines on leaves of cranberry, Oxycoccos macrocarpon, from 

 Cranberry Island, Buckeye Lake, Ohio. The species is pecu- 

 liar in the genus in that it is single brooded: the cranberry 

 plant from which the mines were obtained was brought from 

 Cranberry Island about August 5, and there were at that 

 time no mined leaves on the plant. Early the following 

 spring the majority of the overwintering leaves were observed 

 to be affected, a single leaf containing sometimes four or five 

 mines. The mine is of the usual type; the pupal case is cut 

 lengthwise in one-half the leaf and when completed measures 

 i by 2.5 mm. The larvae were full grown early in May and 

 produced moths during the first half of June. The moth 

 apparently deposits its eggs on the leaves of the new growth, 

 to remain without hatching until the following spring. Tin- 

 mined leaves of the preceding year's growth are lost early in 

 the season. 



This species is distinguished from others of the genus by 

 the brighter orange color of the apical half of the wing. ( '. 



