cluster fly
noun
1- a fly which often enters buildings in large numbers during the autumn while looking for a place to overwinter粗野粉蝇。
1.1
- Pollenia rudis (family Calliphoridae), whose larvae parasitize earthworms, and the smaller Thaumatomyia notata (family Chloropidae).粗野粉蝇（拉丁名Pollenia rudis, 丽蝇科）和体形较小的黑条毛盾秆蝇（拉丁名Thaumatomyia notata）（秆蝇科）, 前者幼虫寄生于蚯蚓。