海南省蚋属一新种(双翅目：蚋科)

记述采自海南省尖峰蚋属蚋亚属Simulium(Simulium)一新种，乐东蚋Simulium(Simulium)ledongense sp.nov.。新种隶属多叉蚋组Simulium multistriatum-group，与秦氏蚋Simulium qiniCao et al.，1993和鞍阳蚋Simulium dphippiodum Chen and Wen，1999近缘。对其各虫期形态进行描述并与其近缘种比较作分类讨论。模式标本保存于遗阳医学院生物学教研室。

A NEW SPECIES OF SIMULIUM (SIMULIUM) FROM JIANFENG MOUNTAIN, HAINAN PROVINCE, CHINA(DIPTERA:SIMULIIDAE)

Simulium (Simulium) ledongense sp.nov. 　　This new species belongs to the multistriatum-group of subgenus Simulium, and is allied to Simulium qini Cao et al., 1993 and Simulum ephippioidum Chen et Wen, 1999. Compared with S.qini, S.ledongense can be distinguished chiefly by: 1) male, antero\|median area of mesonotum with a round silvery spot, flanked by two L\|shaped gray brownish spots; the greater part of legs dark brown; basal 3/5 of median sclerite fine, left 2/5 swelled remarkably with a median cleft; parameral hooks with about 15 spines; width of ventral plate nearly 3 times its length; 2) female, end of stem of genital fork swelled; distal 1/3 of each arm of genital fork with a horn\|like protuberance; anterior gonapophyses cone\|shaped; 3) larvae, antenna with 4 segments in proportion of 9.6∶8.3∶3.5∶0.4; postgenal cleft heart\|shaped; the last abdominal segment with accessory sclerite; rectal gill lobes compound with 5 secondary lobules each. Compared S.ledongense with S.ephippioidum, besides throax pattern, color of legs, special shape of median sclerite, proportion of width and length of ventral plate, shape of anterior gonapophyses, shape of postgenal cleft, proportion of segments of larval antenna, larvae with accessory sclerite, and number of secondary lobules of rectal gill lobes, as stated above, S. ledongense can also be distinguished from S.ephippioidum by: 1) male, style about 2 times as long as coxite; 2) larvae, postgenal cleft about 4 times as long as postgenal bridge. Holotype ♂, paratypes 1♂,1♀, 3 pupae and 2 larvae, were collected in a small stream from Jianfeng Mountain, Hainan Province(18.6°N, 108.17°E), 600?m, China. All the type specimens are deposited in the Department of Biology, Guiyang Medical College, Guiyang.