山田 量崇

Four species of the genus Amphiareus are recognized in southeastern Asia, including two new species, A. edentulus and A. rompinus, both from Johor, Malaysia. The two known species, A. constrictus ( Stal) and A. ruficollaris Yamada & Hirowatari are also diagnosed and figured; the latter is recorded from this region for the first time. The genus is diagnosed and briefly discussed.

Cardiastethus affinis and C. pseudococci pseudococci were recognized in Kerala State, southern India: the latter is recorded from India for the first time. It is found that Cardiastethus affinis is associated with Orthaga exvinacea (Lepidoptera: Pyralidae) and C. pseudococci pseudococci is associated with Opisina arenosella (Lepidoptera: Xylorictidae). Revised diagnoses and illustrations of both species are given. Biological notes for Indian species of Cardiastethus and a key to the three local species of the genus are provided.

The flower bug genus Physopleurella Reuter 1884 of southeastern Asia is revised. Six species are recognized from this region, including three new species: P. malayana, n. sp., P. nigrifemora, n. sp., and P. striata, n. sp. Physopleurella armata Poppius 1909, P. pessoni Carayon 1956, and P. flava Carayon 1956 are recorded from southeastern Asia for the first time. Keys are provided to distinguish species.

異なる森林環境における小蛾類群集の構造の違いを比較し,小蛾類の環境指標性を検討するため,静岡県熱海市および函南町において植生の異なる3地点(庭園的環境,緑地公園,原生林)を選び,2001年5〜7月,および9月に計4回,灯火法(カーテン法)による調査を行った.小蛾類群集の比較には各地点の種数と個体数,種多様度指数(1-λ),優占種,幼虫期の食性および群集問の類似度(GS)と重複度(cπ)を用いた.採集された小蛾類の種数と個体数は,庭園的環境(120種271個体),緑地公園(95種357個体)と比較して原生林(191種601個体)がもっとも多かった.3地点ともにハマキガ科,メイガ科,キバガ科の3科が上位を占めていた.スガ科の種数は原生林で特に多く,ハモグリガ科の種数は庭園的環境と緑地公園で多かった.小蛾類群集の種多様度(1-λ)は,全地点で0.95以上を示した.優占種は庭園的環境と緑地公園で類似しており,原生林の上位5種は,他の2地点と共通する種がなく特徴的であった.各地点間の種構成の類似度(QS)は,いずれも低い値を示した.食性のタイプ分けの結果,幼虫が草本や木本植物を食べる種だけでなく,主に林床部で枯葉などを食べる腐食性の種数も原生林でもっとも多かった.また,腐食性の種が各地点の総種数に占める割合はいずれも10%前後と比較的高く,林床部も腐食性の種にとって良好な環境が保たれていると考えられた.以上のことから,小蛾類は林床部を含めた森林環境を評価する指標として有用であることが示唆された.

A new flower bug, Buchananiella atrata, is described based on recently collected specimens from Indochina and the Malay Peninsula; and Buchananiella crassicornis Carayon is recorded from Thailand for the first time. Buchananiella atrata Yamada and Hirowatari, new species, is closely allied to the latter species, from which it is separable by rostral segment III being blackish brown with pale yellow apex, the entirely blackish brown femur, and the paramere being apically modified into a acute projection and a swollen portion.

Three species of the anthocorid genus Xylocoris Dufour are reported from rice mills in southern Thailand. They are considered effective biological control agents against stored-product insect pests. Two of them, belonging to the subgenus Proxylocoris Carayon, are described as new: X. cerealis Yamada and Yasunaga, n. SP., and X. hjwfinipennis Yamada and Yasunaga, n. sp. A key is provided to help distinguish these species.

Two species of the anthocorid genus Buchananiella Reuter are recorded from Japan for the first time. Buchananiella leptocephala sp. nov. is described here based on specimens from Honshu and the Ryukyus. Buchananiella crassicornis Carayon, hitherto known from the Ivory Coast and India, was found in the Ryukyus.