F.LACIITSTA. 219 



onc(l) ; in tlio posterior wings the median and diseoidal veins are dis- 

 tinct. 



From the variation in the neural ion of the anterior wings, as 

 above inenticnied, it is extremely probable that, natural as this 

 genus at first sight appears, it may hereafter be capable of sub- 

 division. The ])erfcct inseets are not unfre([uently met with in 

 little swarms, being actively on the wing during the afternoon or 

 evening; when at rest they sit vei-y closely a])pressed to the leaf, 

 blade of glass, or other substance on which they happen to repose, 

 and appear perfectly sluggish; but the moment the collector in 

 attempting to catch the inert s])ecimen agitates the foliage, or 

 breathes too roughly on its resting-plac(>, quickly the antenu.e, 

 which had lain cove'jiant by the side of the insect, start forward, 

 are briskly agitated, and the insect, now completely roused from 

 its seeming torpor, runs forward, sj)rea(ls its wings, and is — gone. 

 " Vfe think we have it, but yet we have it not." Most of the 

 species appear to Ije double-brooded, ap])earing in May and Au- 

 gust; some, which we only meet with in June or 'luly, have pro- 

 bably only a single brood in the year ; yet of the double-brooded 

 s])ecies the xiugust brood seems far less numerous than the ]\fay 

 brood, wdiich is no doubt owing to the ])erfect insects keeping 

 themselves more concealed, as we have observed to be the case in 

 other late-appearing species. 



The fortunate discovery by Wx. Logan of the lai'va of one of 

 the species, has already led to the discovery of a considerable 

 number; no less than eighteen diU'ereut larva; having been al- 

 ready distinguished, several of which have been reared. From 

 these we Inid that the habit of the larva; of this genus is to mine 

 in the leaves, and down the stems of grass; but there is consider- 

 able diversity in the mode of mining, some species remaining al- 

 ways at the top of the leaf, others descending down the stem to- 

 wards the root ; in the mines of some speci(!s the leaf remains 

 flat, in others it has an inllatcd or puckered ap[)earance. The 

 larva; of the May brood may be found throughout the winter and 

 early spring; the larva; of those species which do not appear in 

 the perfect state till June or 'Inly, may be met with in April and 

 May; the larvae of the August brood, feeding up at the end of 

 June, arc less (-asily observed, from the geiu;ral luxiu'iancc of ve- 

 getation at the time. The larva when full-fed cpiits the mine 

 and changes to a naked, rather angulated pupa, on the stem or 

 leaf of grass, or some neighbouring plant; a belt of silk is gene- 

 rally placed round the middle (jf the pupa, which is also attached 

 by its tail, but no outer covering of silk is made by any of the 



vor.. HI. 2 K 



