Naarda octogesima sp. n.

(Figs 1, 13, 25, 28)

Holotype. m, Thailand: Prov. Nan, DoiPhuKhaNP, betweenPuaandBoLuang, 1350 m, 101 05’E, 19 12’N, 3.XI.2002, leg. B. Herczig & G. Ronkay; slide No. RL 7903m (coll. HNHM).

Paratype. Thailand: 1 f, Prov. ChiangMai, 1600m, betweenFangandNorLae, 99°09’E, 20°02’N, 28.10.2002. leg. B. Herczig & G. Ronkay; slide No. TB 399f (coll. HNHM) .

Taxonomy. Accordingtothemalegenitalia, N. octogesima and N. laoana spp. n. representadistinctlineage.

Description. Wingspan 21–24 mm, lengthofforewing 11–12 mm. Antennaefiliform, ciliate, inmaleciliaarrangedintofourtransversearrays, lengthofciliatwicediameterof flagellum; infemaleoneciliumpersegment, shorterthandiameterofflagellum. Length oflabialpalps 2.5 timesthediameterofeyeinmale, threetimesinfemale, inbothsexes tipnotlight, dorsalscaleslong, dorsaledgestronglyconvex. Scale-hoodofvertexbroadbased, relativelylong, itstipbifurcate. Profemoraand – tibiaeinmaleslightlythickened, hairy. Characteristicwingpatternfeatures: costanotconcaveinmale; groundcolourgreyishbrowninmale, darkerinfemale; subterminallinegreyishwithtwoprojectionsinwards inmale, moresinuousinfemale; postmediallineparalleltothesubterminalbutslightly moresinuouswithanangulationinwardsnearlytouchingreniformspotinmale; medial linebroad, dark; antemediallinepresent; reniformstigmabig, paleyellow, 8-shaped, with greyishdotsinthetopandbottomhalves, orbicularstigmarelativelybig, paleyellow. Hindwingslightlypalerthanforewing, withthreetransverselines, basalonebroaderand moreprominentinmale.

Malegenitalia (Fig. 1). Uncusrelativelylong, curved, bulgedventrallyatbasalhalf, itstippointed. Scaphiumaslongasuncus; tegumenlongerthanvinculum, thelatterbeingverystrong. Saccusbroad-based, long, wide, itstiprounded. Baseoftranstillavery broad. Shapeofjuxtalikeashieldorcoat- of-arms, withasmallnotchatitsventro- medial edge. Valvabroad-based, abruptlytapering. Cucullusfreeonlyatitstip, verynarrow. Sacculusverywell- developed, basallynarrow, distallydilated, itsdistalendtwicebroader thanbase. Harpearelativelybroad-basedprocess, itstiprounded, itsbasefusedwiththe ventro- lateralcornerofthesacculus. Costaheavilydeveloped, endinginlong, bifurcate process, ventralextensioncurvedventrallybeyondtheharpe, dorsalextensiontongueshaped. Aedeagusstraight, verythickandshort; vesicaglobular, twicelongerthanaedeagus, itsdistalthirdampleandscobinate, withanultimatelylong, strongcornutusemergingclosetocarina, being 2.5 timeslongerthanaedeagus.

Femalegenitalia (Fig. 13). Ovipositorlobesrectangular. Apophysesquitebroad; apophysesposterioresca 1.4 timeslongerthanapophysesanteriores. LobesofsternumA7 rounded. Basalhalfofsinusverynarrow, itsposteriorpartbroad. SternumA7 withlarge, rounded, broad-based, sclerotisedplate. Ductusbursaebroadandveryshort, strongly sclerotised, connectedtocorpusbursaeratherproximallyatdorsalside; withrathertubular, heavilysclerotised, terminallyslightlycurvedanteriorpocket. Corpusbursaeglobular, denselyscobinate; appendixbursaeshortlyconical.

Diagnosis. Theclosestrelativeofthisnewspeciesis N. laoana sp. n. The differentialexternalmorphologicalfeaturesof N. octogesima areasfollows: the ground-colourofwingsisdarkerin N. octogesima thanin N. laoana, thebasal areaofwingsislessochreoussuffused, the 8-shapedreniformstigmaismore prominent, moredistinctlypaleyellow, andtheorbicularstigmaisalsomore conspicuous. Inthemalegenitalia, theventralprocessofvinculumisstronger, thickerin N. octogesima, thedorsaledgeofcostaisslightlycurved, thesubapicalneckisconsiderablythinner, andthebifurcateprocessissmallerwith shorterextensions. Thehugecornutusintheaedeagusisslightlylongerthan in N. laoana, itsdistalhalfsinuousandtaperingintoacutetip (notbifurcate asin N. laoana); andthevesicahaslargedistalscobinateareaincontrastto N. laoana . Inthefemalegenitaliatheductusbursaeismuchbroader, thecorpus bursaeismorespherical, itssurfaceismorescobinate, andtheappendixof ductusbursaeislongerthanthoseof N. laoana .

Themalegenitaliaof N. octogesima aresomewhatsimilartothoseof N. abnormalis (Hampson, 1912), buttheuncusandthescaphiumarenarrower, longerandmorecurvedinthenewspecies, thenotchofthejuxtaissmaller, thesaccusismuchmoreelongate, thecostaismuchmoredeveloped, thedistalpartofsacculusismuchbroader, buttheharpeissmallerthanin N. abnormalis . Thetwospeciesareratherdissimilarexternallyas N. octogesima is considerablylargerinsize, havingconvexcostaofthemaleforewing, much strongercrosslinesonbothwings, conspicuouslargeandyellowreniform stigma, andthehindwingismuchdarkerthanin N. abnormalis .

Etymology. Thespecificnamereferstotheunique 8-shapedreniformstigma.

Distribution. NorthernThailand.