black fly

Japanese: black fly（英語表記）blackfly

...The female worms in the mass produce microfilariae larvae that invade the eyeball, causing conjunctivitis and keratitis, and may even cause blindness if the retina and optic nerve are also affected. The intermediate host is the blackfly, and the microfilariae ingested by the blackfly's blood meal develop in the blackfly's pectoral muscles into larvae that can infect humans. The main species of blackflies that transmit onchocerciasis are Simulium damnosum and S. naevi in Africa, S. ochraceum , S. metallicum , and S. callidum in Guatemala and southern Mexico, and S. metallicum in Venezuela. ...

From 【Black fly】

...General term for insects belonging to the family Simuliidae in the suborder Mesocerca of the order Diptera. The English name is black fly or buffalo gnat. The standard Japanese name is buyu, but there are few regions where it is actually called buyu. In eastern Japan, it is often called buyo, and in western Japan, it is often called buto.

*Some of the terminology that mentions "black fly" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…腫瘤内の雌虫からミクロフィラリア幼虫が産出され，これが眼球に侵入し，結膜炎や角膜炎をおこし，さらに網膜や視神経も侵されると失明の原因となることがある。中間宿主はブユblackflyで，吸血によって摂取されたミクロフィラリアはブユの胸筋内で発育してヒトに感染可能な段階の幼虫となる。オンコセルカ症を媒介するブユのおもな種類は，アフリカではSimulium damnosumおよびS.naevi，グアテマラやメキシコ南部ではS.ochraceum,S.metallicum,S.callidumなど，ベネズエラではS.metallicumである。…