Belongs to the complex of Neosilba peltae McAlpine & Steyskal (1982) , its chaetotaxy is similar to N peltae chaetotaxy and won't be redescribed, the only difference is that
the prosternum of N mcalpinei n sp. is hairless. Neosilba mcalpiniei n. sp. was collected in the
State of Amapa, Northeastern of Brazil in a border of lowland Amazonian forest; it was reared from flower bud of Eschweilera conacea that has a wide distribution in the north and Northwest of South America It is the first Neosilba species reared from flower bud.
Description: Holotype: Male in poor state of conservation, antenna and left wing missing. Male genitalia Ventral margin of surstylus with broadly spaced long setulae (Fig 1), posterior base of surstylus with a row of four prensisetae and one more smaller and more spaced, at each side (Fig 2) Cerci large and broad. Aedeagus short, with an arrow-like shape in the dorsal portion of apex (Fig. 1). Posterior lobe of epandrium with long and fine setae. Head, thorax and wmgs common to complex, no distinction can be made between the species of
this complex using characters of head, thorax or wings, for details see McAlpine & Steyskal (1982).The only remark is that the prosternum of this species is bare.
Adult reared from flower bud of Eschweilera coriacea