170 PAPERS BY DR. B. CLEMENS. 



and the images had escaped, so that I am unable to furnish 

 any further particulars respecting the species. 



2. L. juglandiella. The larva makes an elongated, rather 

 wide tract on the upper surface of the leaves of black walnut, 

 without folding the leaf, and may be found from the beginning 

 to the middle of the month. 



Itis blackish or blackish-brown, with a few pale-brownish 

 dots on each side of the thoracic segments, and with the tip of 

 the abdomen and head pale brown. It belongs to the second* 

 larval group described in the Proceedings of the Academy of 

 Natural Sciences of Philadelphia, November, 1859, and may 

 not be specifically distinct from L. cary&foliella, described 

 on page 323. f 



ASPIDISCA.t 

 Habits of the Larvce. 



The larvae of this genus are characterized by making a 

 small blotch mine between the cuticles of the leaves, and 

 when they have arrived at maturity weaving a cocoon between 

 the cuticles, and cutting out of them a small, oval disk, thus 

 leaving a hole in the mined place of the size and shape of 

 the cocoon. In this respect they resemble the genus Anti- 

 spila. 



The larvaa of the two genera are, however, easily distin- 

 guished by their colour ; the Antispila larvse are white or 

 whitish, with black dorsal and ventral spots, while the Aspidisca 

 larvae are reddish-brown. The disk of the latter is likewise 

 always fixed by a button of silk to some object in the neighbour- 

 hood of the food-plant, and the pupae must be kept in a dry vessel 

 after the disks have been cut out, otherwise the insects will 

 not come to maturity. On the other hand the Antispila 

 require a damp situation after entering the pupa state. 



See ante, p. 63. H. T. S. 

 f See ante, p. 74. H. T. S. 

 J See ante, p. 104. H. T. S. 



