50 IN MEMORIAM. 



mountains, and the moth made its appearanee at the end of 

 May. (1859.) 



Nepticula argyropeza, Zell., Heyden (E. Z. 1861, 

 p. 40). The larva occurs in great numbers mining the 

 leaves of the wJiite poplar (Populus alba). The mine forms 

 an elongate brownish-yellow bh)tch at the base of the leaf, 

 close to the foot stalk, between two ribs. Most frequently 

 two mines are found in a leaf, one on each side of tiie mid- 

 rib. I have never found the mine in any other part of the 

 leaf. 



I first discovered the larva at Wiesbaden in the middle of 

 October, 1858, but out of a large number which I collected, 

 not a single specimen attained the pupa state. Last year I 

 collected the larvs here at Frankfort at the end of October 

 in the already fallen leaves. In the first half of November 

 the larvae quit the leaves, and spin their cocoons ; these are 

 oval, lather arched above, scalloped, of a reddish-brown, 

 more rarely of a yellowish-brown. 



The perfect insect made its appearance in the room from 

 the beginning to the end of March, and still continued to 

 appear in April, when I likewise met with it out of doors. 

 (1858.) 



[In a subsequent note, E. Z. 1865, p. 106, Senator von 

 Heyden remarked that the above-mentioned species is not 

 ArgT/ropezUj Zeller, but Sericopezaj Zeller. This is 

 clearly an erroi", Sericopeza being a maple feeder. The 

 poplar-feeding species of the genus Nepticula have been 

 woiked out with some care by Professor Fritzsche, of 

 Freiberg, in Saxony, but unfortunately his observations have 

 not yet been published.] 



Nepticula apicella, Stainton, Heyden (E. Z. 1865, 



