ATOPOPHYSA; HYDRELIA. By L. H. Prout. 267 



somewhat swollen laterally, the incisions deep; head light brown, body green with yellowish subdorsal line 

 and lateral stripe and with variable red spots or blotches, especially on and above the legs. On mountain 

 ash (Pyrus aucuparia). Pupa hibernating; rather stout, tapering rapidly posteriorly; reddish brown, the wings 

 green. The' moth emerges in July and is found by day sitting on tree-trunks. It is local in Northern and 

 Central Europe, Russia, Lhe Altai, Japan and across North America from Anticosti and New York to 

 Vancouver Island. 



65. Genus : Atoxtopliysa Warr. 



Differs from all the rest of the group in having the palpus rather long and strong, but the shape, 

 scaling and markings seem to indicate that il really belongs here rather than to Cidaria. Antenna in cf simple, 

 anal claps strongly developed. Areole double; o''' dLscocellular of forewing very oblique. A bladdery fovea 

 present on the cf forewing beneath. Discocellulars of hindwing biangulate. 



Only one species known, inhabiting Northern India and China. 



A. indistincta Btlr. (=: naparia Leech, '^ Oh.) (13 e, 8 b, as naparia). Glossy grey, sometimes with tinge indislincta. 

 of purple-brown. Forewing with fine dark, little curved subbasal line, parallel antemedian and 4 postmedian, 

 sometimes rather ill-defined except at the veins and at the hindmargin, forming narrow bars or bands, the 

 postmedian commonly black-marked at the radials, 2 dark subterminal lines, an oblique, interrupted black 

 mark from the apex and usually dark subterminal spots between the radials. Hindwing with inner margin 

 rather long, distal margin slightly subcrenulate, not or scarcely convex from the 2"'' subcostal to 3"* radial; 

 paler than forewing, with weak double postmedian and subterminal lines, darkest at inner margin. Under 

 side weakly marked. A variable species in the strength of the markings. Dharmsala and China (Omei-shan 

 to Ningpo), as well as at Simla and the Khasi Hills. 



66. Genus: Hydrelia Hbn. 



tl Face smooth. Palpus short, shortly scaled. Antenna in cf ciliated. Hindtibia with all spurs. Forewing 



with areole single, often small. Hindwing with discocellulars not biangulate, P' median usually free, ex- 

 ceptionally {nisaria and hicauliata) stalked. 



The larvae (so far as known) are moderate or thick, with strongly marked segmentation and with the 



»head small; they live on trees. 

 Distributed in the Palearctic and Indo-Australian Regions and in North America. 



A. Distal margin of hindwing not strongly crenulate (Hydrelia). 



H. nisaria Ckr. (13e) may be known by its diminutive size and by its neuration, which is almost nisaria. 

 like that of Cainbogia. Colour rather variable, similar to that of tcstaceati but appearing rather darker and 

 more brownish, chiefly because the lines are rather thick and strong. Postmedian brown line (band) of forewing 

 marked with black dashes on the veins; postmedian line of hindwing thick. Black discal dot of forewing 

 conspicuous. S. E. Siberia, Korea and Japan. 



H. parvulata Stgr. is at least as small as nisaria, but with broad white outer band, white line at distal parvulata. 

 margin, etc. Not quite so broad-winged as testaceata. Neuration normal. Forewing mixed grey and brownish, 

 with narrow white subbasal and broader white postmedian bands, indistinctly dark-divided; median band 

 with a blunt distal projection in the middle and containing a large black discal dot and partly broken by 

 whitish dots or interrupted lines; distal area also partly interrupted with white markings, especially in its 

 posterior part; terminal black streaks separated from the dark distal area by a sharply white line; fringe 

 dark, narrowly intersected with white at the vein-ends, at the apex whitish. Hindwing whitish, with 3 

 approximated dark lines in the middle; basal and distal areas more or less darkened. Forewing beneath grey, 

 with black cell-dot and rather broad whitish postmedian band; of hindwing white, with cell-dot and weak grey 

 band, or more similar to that of forewing. Ussuri district. 



H. tenera Stgr., founded on a single ? from Raddefka, Amurland, taken in May, almost certainly belongs tenera. 

 to the Hijdrelia group, probably to Hydrelia. It is only a little larger than nisaria, very thinly scaled (recalling 

 the aspect of light specimens of Oporinia dibdata), light grey, finely dark-dusted, weakly marked. In the distal 

 area of the forewing 2 or 3 rows of dark dots on the veins represent the lines; a discal dot and very weak 

 costal half of postmedian line are also present. Hindwing whitish grey; discal dot obsolescent, crossed by a 

 very faint line; distal area with 2 others equally faint, stroager at inner margin. Both wings with conspicuous 



