Rhopalosyrphus ecuadoriensis

Diagnosis
In the key of Weems et al. (2003) this species keys to R. australis Thompson, 2003 because tergite 3 is short: a little more than half as long as tergite 2. However, in R. australis tergite 3 is about 1/3 as long as tergite 2, which places R. ecuadoriensis somewhat intermediate between R. australis and the other two known species of Rhopalosyrphus, as far as this character is concerned. Other differences with R. australis are (character state in R. australis in parentheses): antennal ratio approximately as 5:1:8 (5:1:10), mesoscutum almost entirely black pilose (white pilose), tergite 3 black (yellow).

Distribution
Neotropical: Ecuador