NOVEMBER, 1859. 83 



subcostal nervure sends three short branches to the costa, and 

 from the apex of the discoidal cell arises a branch furcate 

 behind the tip, one of the nervulets proceeding to the costa 

 before the tip, the other to the inner margin. The median 

 nervure sends two approximated veins to the inner margin 

 near the tip. In the posterior wings the subdorsal is simple, 

 ending in the tip, the median furcate near its marginal ex- 

 tremity. 



The head of the larva is thin, flat and circular, with the 

 mandibles forming an appendage in front on the median line 

 similar to some of the Lithocolletis larvae. 



The body tapers somewhat posteriorly, with the sides of 

 the segments slightly projecting and flattened, with the 

 general form rather cylindrical. It is without feet or pro- 

 legs, and is very inactive, making little or no voluntary 

 motion when removed from the mine, and does not retreat in 

 its mine when touched. The body is somewhat viscid. 



The mine is a linear tract just wide enough to accommo- 

 date the body, long and winding. The larva does not con- 

 sume all the parenchyma of the leaf along its tract, but 

 simply separates the upper epidermis, so that it is not trans- 

 parent. When full grown the end of the mine is enlarged, 

 and the cocoon woven in a little pucker of the leaf within the 



The perfect insect is very 

 sluggish, at rest carrying its /r^- 



antennae thrown backward, but 

 arched somewhat above the dorsal 

 surface. 



P. vitigenella.* Antennae brownish-silvery, fuscous at 

 the tip. Head and thorax silvery-white. Fore-wings silvery- 



* Printed Vitegenella, but corrected in pencil by Dr. Clemens to Vitigenella. 

 I received two specimens of this from Dr. Clemens; it is closely allied to onr 

 Suffusella, Zell., and Saligna, Zell., but is smaller, and tbe position of the 

 subapical dorsal streak is different. The exp. al. (omitted by Dr. Clemens) 

 is 2i lin. H. T. S. 



G2 



