HEMLSTOLA. By L. B. Prout. 31 



H. zimmermanni Hed. (3 a) is very similar to chrysoprasaria, but with tlie elbf)w at end of third radial zimmer- 

 of hindwing enlarged into a more definite tooth, the lines dentate, that of hindwing making a distad bend at '"«»"»• 

 inner margin, and with longer pectinations and palpus, at least in the $. Inhabits Amurland and Ussuri at the 

 end of June and in July. Staxjdinger states that he has received from the former territory examples with 

 the lines so weakly dentate that he suspects they may be hybrids between the present species and chrysopra- 

 saria, or even that we are dealing with a mere aberration. The latter supposition is precluded by the palpal 

 and antennal differences. 



H. dijuncta Walk. Of this species I have only seen faded specimens. It seems to be very closely allied dijuncla. 

 to veneta, perhaps of a rather lighter, bluer green, the hindwing more rounded apically, with slightly sharper 

 tail and with the postmedian line placed more proximally. It cannot be a mere form of that species however, 

 for the palpus is short. Hindwing with first median separate (in veneta stalked, or at least connate). Shanghai, 

 Yokohama, Nikko, etc. May, June and August. It is not impossible this may be the species which Staxjdinger 

 records from Japan as ,,var. ? an sp. div. ?" to chrysoprasaria. 



H. veneta Btlr. (2 h). Palpus of moderate length, third joint in $ rather long. Colour bright green, reneta. 

 the white lines slender, placed somewhat as in chryso'prasaria, the antemedian of forewing less strongly curved, 

 postmedian usually well removed from it, the line on the hindwing forming a continuation to this line, not 

 placed further distally as in chrywprasaria. Angle of hindwing slightly stronger, more as in zimmermanni. But 

 differs above all in having a very fine olive brown marginal line and whitish fringes spotted with red brown. 

 Under surface paler, the lines almost or altogether obsolete. Japan: Tokio, Oiwake, etc., in July, August and 

 September. Also from Gensan, Korea. Varies considerably in size, but scarcely otherwise. 



H. insolitaria Leech (2 h) only known to me in a single example, and that not in quite perfect condition, InsolUaria. 

 is exceedingly like veneta, and may prove to be an aberration of it. The angle in the hindwing seems some- 

 what stronger, the colour of both wings slightly fuller and darker, the antemedian line weak (rather too distinct 

 in our figure), postmedian not even faintly denticulate, spots on the fringe perhaps brighter red. Satsuma, 

 Japan, captured in May. Type {^) in coll. Brit. Mus. The specimen from Chang Yang which Leech referred 

 to this species as its $, is a Hemithea allied to unilinearia. 



H. parallelaria Leech (2 h) bears a remarkable superficial resemblance to HipparcMis vallata, the distal parallelaria. 

 margin of the forewing being straighter and the tail of the hindwing stronger than in the preceding species, 

 while the red-brown spots in the fringe are restricted to a large one at this tail and a small one at the 

 end of the first median of hindwing almost exactly as in vallata. The structure, however, is that of Hemistola 

 and the underside, as is usual in this genus, is simply a paler, weaker reproduction of the upper, not white- 

 banded as in vallata. Western China: Mou-pin and Ni-tou. 



H. nemoriata Stgr., which is quite unknown to me, may possibly (according to the characters given) ncmoriata. 

 belong to this genus. It was founded on a single worn ^ from south-eastern Siberia, and is described as verdi- 

 gris green with a fine, weakly dentate white postmedian line and a dark marginal line, forewing in addition 

 with a faint, almost invisible antemedian line. Shape somewhat as in Nemoria, antennal pectinations as long 

 as in smaragdaria, palpus even thinner and shorter than in Thalera, hindtibia with two pairs of spurs. 



H. detracta Walk. (= unduligera Btlr. = vestigiata Sivinh. = annuligera Warr.) (2 h) is not unlike detracta. 

 chrysoprasaria in shape, the elbow in hindwing generally weak, sometimes wanting (as in lissas); very different 

 in its much smaller size, duller blue-green colour, strongly dentate lines and the presence in the centre of each 

 wing of a large white ring. Costal edge ochreous. Underside paler, unmarked. Widely distributed in north- 

 west India, including Kulu and Kashmir. Our figure of the <J is copied from Butler's very bad figure; the 

 $ is from nature. 



H. dispartita Walk. (2 h) differs from all the preceding Hemistola-ST^ecies in having non-pectinate $ di!<partita. 

 antenna, and forms, together with a few North Indian species, a separate section of the genus. Colour near 

 that of chrysoprasaria, slightly more yellowish green, postmedian line denticulate, on hindwing out-bent in the 

 middle ; both wings with a rather large white cell-spot. North-west India, including Kashmir, where it occurs 

 towards the end of June. 



Note. — The species from Korea described and figured byALPHERAKY as Thalera tenuilinea is also 

 likely to be a Hemistola, unless it form a new genus. It is unfortunately entirely unknown to me, and its author 

 gives practically no information about the structure, but it would be somewhat aberrant in possessing ,,four 

 small white crests on the abdomen" — although there is just a suspicion of cresting in riibrimargo and perhaps 

 one or two other species of the genus. In size and shape and in the bright colouring tenuilinea would seem to 



