few genera a scale-tooth ; fore wing Avitli vein 1 a weak, not anasto- 

 mosing with vein 1 6, 1 c absent ; 2 from middle of cell or in one or 

 two cases from near its extremity ; 3 and 5 from near lower angle, 

 in Euplexidia vein 5 almost straight and from just below middle of 

 discocellulars ; 6 from upper angle or just below it; 9 from 10 

 anastomosing with 8 to form the areole, in a few genera the areole 

 absent and either vein 7 or 10 from the cell, vein 9 being some- 

 times absent; 11 from cell. Hind wing with veins la and h 

 present, 1 c absent ; 3, 4 from lower angle of cell, rarely stalked ; 

 5 obsolescent from or from below middle of discocellulars ; 6, 7 

 from upper angle or slightly stalked ; 8 arising free, then bent 

 downwards and touching the cell, then again diverging ; in Stilbiu 

 and allies and a few other genera with vein 8 anastomosing with 

 the cell to or to beyond middle. 



In the genera without an areole its absence appears to have been 

 always caused by reduction from forms which once possessed it, as 

 it is minute in some of their allies. 



In Eriopus the males of most of the species have secondary sexual 

 developments of the antennas, the basal part of the shaft being 

 thickened with an angular projection near its middle, often with 

 scale-teeth or long bristles beyond it, the legs also having greatly- 

 developed tufts of hair of various forms ; in two species the males 

 have a large curved conifious hook on the ventral surface of abdomen 

 projecting backwards from the preanal plate. 



^;^f^:^^ 



Fig. 1. — Jjarva. oi Acwnycia psi. \. 



The larvse are usually smooth, the warts with one hair ; all the 

 prolegs present, the 12th somite with more or less developed dorsal 

 hump. 



In Acronycta the larvse sometimes have the hairs spatulate at 

 extremity ; many species have tufts of long hair from the warts 

 supplemented by bunches of fine feathery hairs, whilst others have 

 numerous secondary hairs from the skin, and largo dorsal pencils of 

 hair. 



In Nonap'ia and its allies the larvae bore in reeds and are almost 

 without hairs, whilst in Hydrce.cia and the allied genera the larvae 

 bore in the stems and roots of various plants. 



The genera Perigea, Brynphila, and a few others come very close 

 in structure to the subfamily Erastriance as regards the development 

 of vein 5 of the hind wing, the former resembling Amyna and the 

 latter Lithacodia, whilst TrisUila, Pseudina, and one or two others 

 have a facies much like that of Tarache, the essential difference in 

 the subfamilies being that the larvae of the Acronyctince have all the 



