Abstract: Insects cause considerable loss of seed in Keteleeria evelyniana Mast. in the central region of Yunnan Province.The insects damaged cone ranged from 60 to 90 percent. The most important species is Blastopetrova keteleericola Liu et Wu, gen. et sp. nov. Other insects are:Shirahoshizo coniferae Chao (Coleoptera:Curculionidae) and Dioryctria sp. (Lepidoptera: Pyralidae).In this paper, besides the descriptions of morphological characteristic of both adult and immature stages on Blastopetrova keteleericoIa, its bionomies, natural enemies, and control measures are also given.Blastopetrova Liu et Wu, Gen. Nov.Fore wing without a costal fold in male. Vein M₂ and M₃ closely approximated or connate at base. Male genitalia: With clasper(harpe). Sacculus is nearly 1/2 as long as valva, basal opening small. Female genitalia: Apophyses anteriores is almost as long as apophyses posteriores. With a pair of signa, the form different.Type species Blastopetrova keteleericola, sp. nov.This new genus is closely allied to Petrova Heinr. and Blastesthia Obr., but may be distinguished by the venation and the genitalia. In the fore wing of Petrova, vein, M₂ and M₃ separate at base. Blastesthia is with only one signa on the bursa copulatrix. In addition, Gravitarmata Obr., Barbara Heinr. and Syropetrova Diak. are related to the new genus, but these genera are without claspers. The main differences among these genera are distinguished by a key in this paper.Blastopetrova keteleericola Liu et Wu, sp. nov.Body length: 7—11mm, 10—12mm. Wing expanse: 17—23mm, 22.5—26mm. Fore wing with a lot of irregular cloudy patterns, which consist of grey, reddish brown and black. Ocellus grey. Central cell is separated by stem R. and M. Hind wing broad, grey. Central cell is separated by stem M₍₁₊₂₎ and M₃.Male genitalia:Tegumen broad. Uncus very small, hemispheric. Socii developed, finger like; long, pending. Valva with obvious neck. Cuculus oval, with densely long hair on the surface,a row short spines on the outer margin. Sacculus large. Basal opening very small. Aedeagus short; cornuti, a cluster.Female genitalia: papillae anales longer, kidney shaped. Ostium bursae round; sterigma larger, hemicycle. Ductus bursae long, with two slender sclerite at the section approaching ostium bursae. Signa two, the big one "I"-shaped, the small one rivet form.Holotype (), Allotype(♀):Yunnan Province, Anning County, 18—Ⅲ—1983, 1885m. Collected by Wu Chunsheng.Paratypes(30, 30♀♀):Yunnan Province, Anning County, Huaning County, Lufeng. County. ibid.Holotype, Allotype and a part of Paratypes are preserved in the Institute of Zoology, Academia Sinica; and another part of Paratypes are preserved in Southwestern Forestry College.