中国局限蚊属局限蚊亚属一新种(双翅目:蚊科)

A NEW SPECIES OF THE SUBGENUS TOPOMYIA OF GENUS TOPOMYIA FROM YUNNAN, CHINA (DIPTERA: CULICIDAE)

本文记述了从云南西北边睡独龙江河谷栗获的一新种局限蚊——张氏局限蚊Topmyia(Topomyia)zhangi sp.nov.并根据新种的特征与近缘种作了比较和讨论。新种的模式标本全部保存于云南流行病研究所。

Topomyia (Topomyia) zhangi sp. nor.Female Small, dark. Wing 3.5mm. Palpus dark scaled. Proboscis 0.8 of the length of fore femur; dark brown, with vertral pale spot on basal part. Anterior pronotal lobe covered with broad, flat silvery scales; posterior pronotal lobe covered with broad, dark brown scales or. upper 0.2, and the pale golden scales otherwise. Mesonotum middorsal line of flat silvery scales reaching prescutellar space. Sutellum dark brown, with broad silvery scales on midlob. Legs mainly dark, midleg and hind leg with ventral pale line from base of femur to apex of 15 Tergites dark brown, I T with large lateral silvery spot; Ⅱ-Ⅶ T each with narrow lateral pale yellow spot with dorsal margin forming straight line. Sternites pale yellow scaled.Male Resembles female except of the following characters: Proboscis with ventral white line to subapex. Mesonotal middorsal line of flat silvery scales only teaching level of wing base. Foreleg with ventral pale line on basal half of femur; foretarsus t2 shorter than t3; midleg with vertral white line from base of femur to apex of t4; hind leg with vertral white line from base of femur to apex of t5, bur veltral white line of t1 very narrow, not visible. Ⅷ 5 dark brown. Terminalia Ⅸ T lobes prominent, each with 3-4 stout lateral setae; two strong spines between lobes. Vertro-medial lobe of basimere with a .longer and 1-2 shorter setae. Apex of the distimere expanded and bilobed. Vertral lobe of claspette large, subquadrate, bearing 2 prominent setae and many short setae; stem of dorsal lobe rod-like and with a simple spine-like filament.Larva Ventral surface of head, thorax and abdomen lightly spiculate. Maxilla not developed, without a digit process. Comb scales 34-55 in a patch, those of posterior row larger; individual scales thorn-shaped with a strong apical spine, laterally fringed with fine spicules. Siphon index about 4; basal distally followed by 6-7 pairs 1-3 branched strongly long setae; near the dorsolateral of the siphon are 7-9 pairs with about 5 branches accessory setae; pecten of 10-16 teeth in an irregular triple row, extending from near base to middle of siphon. Setae 1-Ⅹ stronger, 4-6 branched; 2-Ⅹ short, about 10 branched; 3-Ⅹ single; 4-Ⅹ 10-15 branched, about 1.1-1.3 length of anal gill; anal gills about 3.0 length of saddle, lageni-form.The adult of new species is very similar to T. (T). inclinata Thurman, 1959 in general appearance, but the latter differs in the following aspects: in males, 1) hindtarsus 1 with vi-sible vertral white line; 2) ventromedial lobe of basimere with 4-5 longer setae; 3) apex of distimere slender, without an accessory lobe. In females, 4.) ventral pale line of mid-and hind legs only from base of femur to apex of tibiae.The larva is very similar to T. (T.) lindsayi Thurman, 1959, but the latter differs in the following aspects: 1) head, thorax and abdomen unspiculate; 2) anal gill longer, about 5-6 length of saddle; 3) 1-Ⅹ usually 3 branched, 4-Ⅹ 5-9 branched, about 0.7 length of anal gills.Holotype ♀, allotype ♂ and paratype 20♀♀, 24♂♂; 31 Larvae; all collected from (lower reaches of Dulong River) Gongshan County (27°69’N, 98°33’E, 1600m.), Yunnan Province (Oct. 1987, Gong and Duan). All types are deposited in the Research Institute of Epedemic Diseases of Yunnan Province, China.