tachinid
noun
tach·i·nid ˈta-kə-nəd 
-ˌnid
: any of a family (Tachinidae) of bristly usually grayish or black dipteran flies whose parasitic larvae are often used in the biological control of insect pests
tachinid adjective
Example Sentences
Recent Examples on the Web Metallic tachinid fly Scientific name: Rhachoepalpus metallicus Distribution: Tropical South AmericaSize: 12 to 15 mm (0.5 to 0.75 inches) longAs its scientific name suggests, this fly has a striking, metallic blue sheen. 
Meilan Solly, Smithsonian Magazine, 29 Apr. 2020 How to call in an earwig predator The earwig's only insect predator in North America is the tachinid fly. The Editors Of Organic Life, Good Housekeeping, 29 Mar. 2017
Meilan Solly, Smithsonian Magazine, 29 Apr. 2020 How to call in an earwig predator The earwig's only insect predator in North America is the tachinid fly. The Editors Of Organic Life, Good Housekeeping, 29 Mar. 2017 Word History
Etymology
New Latin Tachinidae, from Tachina, genus of flies, from Greek tachinos fleet, from tachys swift
First Known Use
1888, in the meaning defined above