10 OZOLA; ARCH^OBALBIS. By L. B. Protjt. 



obliquaria. A. obliquaria Leech (= lineata Warr.) (1 e). White with a peculiar brownish smoky gloss. Forewing 



with first line curved, very faint, only indicated by some slight pale shading which accompanies it proximally; 

 second line angled, then rather oblique, becoming median or almost antemedian on hindwing, indicated by a slight 

 darkening of the ground-colour and accompanied distally by a pale band. Both wings with a large roundish discal 

 patch and an apical patch pale bluish grey. Marginal spots black, distinct. Under surface white, with the discal 

 and apical patches black, marginal spots as above. Western China: Omei-Shan in July, Chow-pin-sa in June. 



17. Genus: Ozola Walk. 



An Indo-Australian genus, of which a single species reaches the southern part of Palearctic Japan. 

 The full description of the genus can be reserved for a later volume. The species is quite unmistakable by its 

 contour, and structurally by the very wide separation of the costal vein of the hindwing from the cell, with 

 which it is connected by a distinct bar. Practically nothing is known of the habits and life-history. 



japonica. 0. japotiica Proiit (1 f). I erected this as a subspecies of impedita Walk., with which it agrees in struc- 



ture. But superficially it is nearer, especially in the less whitened ground-colour, the complete line and small 

 discal spot of the hindwing, and perhaps one or two other characters, to sinuicosta Prout. From both it differs 

 in the less angulated proximal line of the forewing and the stronger submarginal series of spots on both wings. 

 It will probably prove a perfectly distinct species. Kiushiu: Nagasaki, Jmie, 1886. Described from specimens 

 in the British Museum. I have since seen it in coll. Wileman. 



3. Subfamily: Hemitheinae. 



A very interesting subfamily, of tolerably uniform structure, especially in the constancy ^vith which 

 the second radial vein of the hindwing (and frequently also of the forewing) arises near the anterior angle of the 

 cell. The prevalence of bright green colouring of the wdngs is also veiy noteworthy, and has gained for the sub- 

 family in England the popular name of the ,, Emeralds", in America of the ,, Greens". The principal structural 

 characters are as follows. Face nearly always smooth. Antenna very generally bipectinate in the ^, and often 

 even in the $ (never unipectinate). Hindleg in ,^ rarely aborted, spurs variable according to the genus. Abdomen 

 often with dorsal crests. Forewing almost invariably with all veins present, the second to fifth sub- 

 costal almost invariably stalked. Hindwing with costal vein variable, second radial arising anteriorly to 

 middle of discocellulars. Larva usually with head bifid, prothorax elevated, usually with double point 

 anteriorly, body strongly granulated. Feed chiefly (so far as known) on trees and shrubs, and are usually 

 rigid, wonderfully assimilated to small tAvigs. A few show still more specialized protective adaptations, 

 those of one group (that of Comibaena) clothing themselves with fragments of leaf, which are attached to 

 special tubercles by means of silken threads. Pupa usually green or rather light-coloured, often strongly 

 marked with blackish, spun by a few threads among leaves. The moths of the more ancestral genera rest 

 on tree-trunks or fences, and are of prevaihngly grey or lichen-Hke colouring. The more speciaUzed rest 

 among green fohage, and are, on account of their green coloration, well protected. They are often very 

 sluggish by day, and when disturbed prefer to flutter lazily to the ground, like faUing leaves, rather than 

 to escape the threatened danger by fhght. The normal time of fhght is the evening or night, and they may 

 be attracted by light; but both in North America and in Austraha the species seem hitherto, for the most 

 part, to have been taken in comparatively small numbers. The Palearctic Region is not remarkably rich 

 in species, but several of them are extremely common locally. The subfamily does not generally ascend to 

 high latitudes or altitudes, and is wanting also in New Zealand, Hawaii, most of Chih and Patagonia. Other- 

 wise its distribution is wide. 



1. Genus: Aj*cbaeobalbis Prout. 

 It is by no means certain that this genus extends into the Palearctic Region, as the two species 



