I'l.lTKM.IDT.. G5 



feeds on the biuls of the ash-treo, and forms an open network 

 cocoon, but its liabits Iiave not yet been fully investigated. 



1. Curtisellus, Don. P.. I. ii. pi. 03 (1793); Step.— CWWm/V, vK- JlT 

 Haw. — macnic'lla. Fab.- — C(cnobUdl((, Jliib.; l)up. — -fruxhidla, Bjerk.? ^a-c 

 — var. rndiea. Haw. Alis anticis albis, luacula magna costali nigra, 

 basim versus attenuata, in medio plicam superante, dorso basim versus 

 striis abbreviatis, transversis, fuseis, margiue postieo uigro nebulosis 

 (var. alis anticis unicoloribus obscure fuscis). Exp. al. 7.V lin. 



Head aud face white. I'alpi dark fuscous ; tips of the teruiiual joiut 

 white. Antenuje dark fuscous. Anterior wiugs white, with a dark 

 fuscous, almost black blotch on the costa, extcndiug from the base to 

 beyond the middle of the wing; at the base it is extremely narrow, 

 but in the middle it reaches across the fold ; in it, ou the costa be.youd 

 the middle, is a small whitish spot; ou the inner luargiu near the liase 

 arc some short transverse fuscous streaks, along the hiuder margin are 

 several dark fuscous or black blotches ; cilia dark fuscous. Posterior 

 wnngs greyish-fuscous, with jialcr cilia. In tiu; variety rmtlca of 11a- 

 worth, the head aud face arc dirty ochrcous, aud the anterior wiugs 

 unicolorous, dingy fuscous. Intermediate specimens, in which the cos- 

 tal blotch is dimly shadowed, occur. 



Not uncommon among ash-trecs in June aiul -luly. ]\Ir. Henry 

 Doubleday found the full-fed larva? descending from the trees by 

 their threads, and bred from them both tlie tyjiical insect aiul the 

 variety. Mr. Preston had previously found the larva feedintr on 

 the hardly-developed leaf-buds of the ash. 



Family IV. PLUTELLIlliE. 



Caput hirsutum. Palpi labialcs articulo sccundo infra in fascieulum pro- 



ducto. ^'Jiilouuc ill quii'te j)ofrcct(T;. Larca fusiformis, 7io)i, sacco- 



pJiora. 



Head rough. Labial palin with the second joiut furnished beneath 

 with a projecting tuft of scales. Jntcmuc pornclcd in repose. Larca 

 fusiform, not liviiuj in a case. 



The porrected antenna) of these insects give them a certain re- 

 semblance with the Coicojj//ori//a; from whicb the bi-oader j)ost(rior 

 wings and rough head suHieiently distinguish lliem, iiuh pendent 

 of the ditl'erence in the habits of the larva;. 



The greater breadth of the anterior wings of the only sp(>eies 

 known in the first genus, does not interfere with its ailinities in 

 other respects, and its true place is certaiidy here. 



The four genera in this family may be easily distinguished 

 thus : — 



VOL. III. K 



