98 ENTOMOLOGICAL SOCIETY 



of the wing and approaching each other at apex; vein 2 simple; vein 

 ic perceptible. Posterior tibiae clothed with stiff hairs above; middle 

 spurs near but below middle of tibia. 



The genus is very close to Nepticula Zeller, but that homo 

 geneous genus of leaf-mining moths will not allow the gall- 

 making populella within its limits. The main structural differ 

 ences which separate Ectoedemia are the smaller eye-cap, the 

 somewhat more strongly developed labial palpi, the closed cell 

 in the fore wings, and the spurs on the posterior tibiae which 

 are situated near but below the middle. I am pleased that my 

 views coincide with those of Dr. Edw. Meyrick, to whom I 

 showed specimens while at his home in Marlborough. 



Type: E. populella, n. sp. 



Ectoedemia populella, n. sp. 



Antennae dark cupreous brown, basal joint forming a small eye-cap 

 enlarged by heavy light yellow scaling. Face and head reddish ochrcous. 

 Thorax dark brown. Fore wings unicolored shining dark cupreous 

 brown, with strong green and violet iridescence according to the light. 

 Hind wings lighter cupreous brown, with ochreous cilia. Abdomen 

 shining dark fuscous. Legs ochreous-fuscous with a bluish metallic 

 sheen. 



Alar expanse, 7-8.5 mm. 



Massachusetts ; New Hampshire. Food plant, Populus. 



Type. No. 9904, U. S. National Museum. 



Described from a very large series of moths bred in the in- 

 sectary of the U. S. Department of Agriculture from galls on 

 the petiole of leaves of poplar received in September, 1884, 

 from Miss C. H. Clarke, Jamaica Plains, Mass., and from A. 

 Koebele at Holderness, N. H. The following are extracts from 

 Mr. Theo. Pergande's notes on the species : 



Each gall contains a single larva, which when mature is 8 mm. long 

 and pale yellow, with pale brown head, mandibles darker, and posterior 

 margin of anal shield brown. Legs only rudimentary and can be en 

 tirely withdrawn from view. 



The gall is almost globular, of about the size of a pea, and is a 

 swelling of the petiole close to the leaf; it is somewhat rugose longi 

 tudinally and of a grayish color. The course of the petiole is gen 

 erally very distinct along its upper side, being smooth and of a reddish- 

 brown or yellowish color. The cavity is more or less irregular on 

 account of the woody fibers, which run through the walls of the gall 

 and which are not eaten by the larva. Late in October the larvae left 



