MARCH, 1863. 215 



streaks and the absence of silvery-violet spots, are the chief 

 differences. The European species burrows in the shoots of 

 Sedum acre (Stone-crop or Wild Orpine), and probably our 

 species may be found in the same plant or another of the 

 genus Sedum. 



GRACILARIA, Zeller.* 

 Proc. Acad. Nat. Sci., Jan. 1860, p. 6. 



Wings with long cilia. Hind-wings narrowly lanceolate ; 

 the costa is concave or excised in the middle. The costal 

 vein is short, entering the costa at the beginning of the con- 

 cavity. The subcostal vein is simple and runs near the 

 costa, and is much attenuated posteriorly. The discal vein 

 runs through the middle of the unclosed cell, arises at the 

 base of the wing much attenuated, and is connected by an 

 inosculating, minute branch with the subcostal vein about the 

 middle of the wing, and becomes furcate at its extremity. 

 The median vein is placed near the inner margin and is 

 3-branched. 



Fore-wings lanceolate. The discal cell is long and narrow, 

 and the subcostal vein is attenuated towards the base, and 

 gives off a single, rather long, marginal branch, quite near 

 the base of the wing. From the hinder portion of the discal 

 cell nine nervules are given off, four of which go to the costa, 

 and five to the hinder margin. The submedian vein is 

 simple. 



Head and face smooth. Without ocelli. Antennas fili- 

 form, as long as the fore-wings. Labial palpi slender, ascend- 

 ing, cylindrical; the second joint with appressed scales, not 

 tufted; the terminal joint pointed. Maxillary palpi rather 

 long, filiform. Tongue clothed with scales. 



In the small species of this genus, the maxillary palpi are 

 less developed, and the labial palpi are almost drooping. In 

 the dried specimen the labial palpi are almost always more 

 or less drooping. 



* See ante, p. 91. H. T. S. 



