Metopolophium humulisuctum Zhang, Chen, Zhong & Li, in Zhang 1999 = Rhodobium porosum (Sanderson, 1900)

Metopolophim humulisuctum, reportedly collected on Humulus lupulus, are presumed vagrants of the widely­distributed rose­feeding species. The type specimen of M. humulisuctum examined has only 4 and 5 rhinaria on antennal segment III, but such low numbers have been seen in specimens of Rh. porosum from Australia, New Zealand and Nova Scotia. The worldwide range is 4–15, with the majority (68%) having 5–11.