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.