关键词: 瓢虫科, 新种, 铁杉球蚜, 捕食

Abstract:

Expeditions were made to Yunnan and Sichuan, southwest of China for searching the potential natural enemies of hemlock woolly adelgid, Adelges tsuga Annand. The collections under report contaid 45 coccinellid specimens. 8 species belonging to 4 genera are enumerated in this paper. Of those, 5 species were described as new to science: Scymnus (Scymnus) najaformis Yu, S.(Pullus)yunshanpingensis Yu, S. (Neopullus) sinuanndulus Yu et Yao, S.(N.) camptodromus Yu et Liu, Pseudoscymnus truncatulus Yu. 2 species of Scymnini remain undetermined. S: (N.) sinuanodufus and camptodromus are found to be the predator of the adelgid through laboratory feeding. The type specimens are preserved in the authon', insdtutes by indicating IPEP for the first author's and RIFP for the latter's in the following text.1. Scymnus (Scymnus)najaformis Yu (Fig. 1) Body length 2.19-2.50mm, width 1.35-1.76mm. Body oval. Head brown with darkish brown eyes; pronotum brown with a Mack basal marking, extending to 2/3 to 3/4 of pronotal length, nearly oval or sexangular in shape; scutellum black: elytra black with 3 pairs of spots, usually interconnected, the extemal spot sometimes disappears or the three spots are entirely wanting; black part of elytron extending posteriorly along the suture, leaving about 1/10 sutural line brown. Venter brown with black pterothorax and basal segments of abdomen, or venter dark to black; legs brown, or femora and tibiae dark brown.Holntype: ♂(IPEP), 26-X-1995, Yunshanping, Lijiang (27.1° N, 100.2°E): Allotype: ♀(IPEP); Paratypes: 1♂2 ♀(RIFP), same data as holotype.This species resemhles the palaearctic species S. (S.) interruptus (Goeze), but the latter varies in coloration with reladvely narrow median piece of tegmen in ventral aspect and the postcoxal line extending to the hind margin of lst abdominal sternite. This species is named after the shape of infundibulum which resembles a Cobra(Naja naja).2. Scymnus (Pullus)yunshanpingensis Yu(Fig. 2)Body length 2.23-2.40mm, width 1.49-1.63mm. Body elongate oval. Head brown with slightly darker eyes; pronotum brown: scutellum black; elytra black with one pair of reddish brown spots, long oblique oval and being at basal 2/5 of elytron, connected to reddish brown apex (1/3 of elytral length), but the black sutuml line extending to 5/6 of elytron; somctimes the spots are separated from the apex if forming one small spot. Venter brown with black pterothoax and basal two segments Of abdomen.Holotype: ♂(IPEP), 26-X-1995, Yunshanping, Lijiang, Yunnan; Allotyep: ♀(IPEP); Paratypes: 1♂1 ♀(RIFP), same data as holotype.The new species has a peculiar coloration, and if the elytral markings disappear, it resembles S. (P.) dichorionicus Pang et Huang in outline, but differs in male genitalia and punctuation on lst abdominal stemite.3. Scymnus (Neopullus)sinuanodulus Yu et Yao (Fig. 3)Body length 1.91-2.14mm, width 1.25-1.37mm. Body elongale oval with nearly parallel sides. Head brown in male and dark brown in female, eyes brown or darkish brown; pronotum brown with a Back basal marking (the marking may enlarge, but the anterior and lateral margins of pronotum are distinctly brown): scutellurm black; elytra brown with a black marking on the base and a pair of long oblique oval spots, along the suture extending to 1/3 elytral length and the lateral sides extending to 2/3 elytral length, lateral marking slightly expanded posteriorly; the spots being at apical 2/5 of elytron, the distance to suture line shorter than that to lateral side. The spots are occasionally connected by the lateral marking. Underside of body Mack with apical part of abdomen brown, sometimes mouthparts, prothorax also brownish; legs brown to dark brown or black, usually darker in female.Holotype: ♂(IPEP), 1-XII-1995, Ningliang (27.2°N, 100.8°E, Lijiang); Allotype: ♀(IPEP), 22-X-1995, Heyuan(26.7°N, 99.9°E, Lijiang); paratypes: 1♂ 2 ♀(IPEP), same data as allotype; 3♂ 3♀ (RIFP), 26-X-1995, Yunshanping. Lijiang.The differences are given with next species.4. Scymnus (Neopullus)camptodromus Yu et Liu (Fig. 4)Body length 1.89-2.19mm, width 1.16-1.35mm. Body elongate oval. Head brown in male, dark brown or black in female with brown mouthparts and Hack eyes: pronotum black with brown narrow anterior margin, sometimes with brown anterior comers; scutellum black; elytral brown with triangular marking at base, along the suture line extending to 1/ 3 of elytral length at most; basal 4/7 of lateral sides Back. The Back area on elytra are always contmcted, leaving only the elytral base dark, but superftcially the figured marking can be observed for the tmnsparent elytra and the dark scutum and scutellum of metathorax. Venter black with apical segments of abdomen brown; legs brown with femora and tibiae largely black, or undenide entirely black.Holotype: ♂(IPEP), 22-X-1995, Heyuan. Lijiang; Allotype: ♀(IPRP); Paratypes: 12 ♀(2 in IPEP, 10 in RIFP), same data as holotype; 5♀ (RIFP), 14-X-1995, Ningliang, Lijiang: 1 ♂, 13-V-1995, Baoxin(30.3°N, 102.8°. Sichuan); 1♀, 15-Vl-1995, same place as previous One.Some specimens of the above two species have incomplete postcoxal line of lst abdominal sternite. The former speceis is named after the sinuate inner margin of nodulus of receptaculum semnis and the latter one is named after the nearly arc-shaped inner margin of nodulus. The two new species resemble each other, although quite different in colour pattern and are distinguishable frorn the following chamcters: S. (N.) sinuanodulus with median piece of tegmen distinctly longer than lateral lobes, infundibulum of female invisible; S. (N.) camptodromus with median piece slightlyshorter than lateral lobes, infundibulum visible. The latter species also resembles S. (P.)suturalis, but differs from the male genitalia and female infundibulum.5. Pseudoscymnus truncatulus Yu (Fig. 5)Body length 2.05mm, width 1.45mm. Body oval. Head yellow with Mack eyes, mouthparts yellow with reddish brown terminal part of maxillary palpi; pronotumyellow; scutellum yellowish brown; elytra black with basal extemal corners yellow andapical 1/5 yellow, sutural line brownish. Venter yellow with black pterothorax anddarkish basal part of lst abdomen; legs yellow.Holotype: ♂(IPEP), 22-X-1995, Heyuan (Lijiang, Yunnan).The present species is closely related to P.fulvihumerus Yang et Wu from Taiwan, but the latter's hind margin of 6th abdominal sternite is emarginate and the medianpiece of tegmen is relatively broad. It is named after the nearly truncate hind marginof 6th abdominal sternite medially.

Key words: Coccinellidae, species, Hemlock woolly adelgid, Predator