Nukuhiva Long-legged Fly (Campsicnemus aa)
This species from the island of Nuku Hiva was described in the year 2009.
The males reach a length of about 0,34 cm, the pale smoky grey colored wings are of about the same lenght. The head is dark brown to black in color, the thorax, which is slightly shimmering bluish on the upside, is brown to dark brown colored and covered with several black setae, the abdomen is dark brown in color and likewise covered with black setae on the upside. The legs are yellowish resp. yellowish brown in color.
The females of this species are hitherto unknown. 
About 200 species of the genus Campsicnemus are currently known from the Polynesian region alone, new species are discovered and described regularely.
 Neal L. Evenhuis: Review of Camspicnemus (Diptera: Dolichopodidae) of the Marquesas, French Polynesia, with description of four new species groups. Zootaxa 2004: 25-48. 2009