Body elongate; pink; dorsum lightly dusted with white wax, allowing body color to come through; without bare areas; venter and infested leaf sheaths with fluffy white wax; 1 pair of inconspicuous wax filaments; poorly developed ovisac present ventrally and behind female. Usually present in leaf sheaths of grass host. Oviparous, eggs pink.
Brevennia rehi is most similar to B. nigeriensis (Williams) but differs by having 6- or 7-segmented antennae (8- or 9-segmented in B. nigeriensis) and no dorsal oral-collar tubular ducts (present posteriorly in B. nigeriensis). This species could be confused with species in the genus Heterococcus because both have quinquelocular pores abundant over the dorsum and venter, but species of Brevennia have at least a few trilocular pores which are lacking in Heterococcus species.
U.S. quarantine notes
This species was not intercepted at U. S. ports-of-entry between 1995 and 2012, but it is included because it is common on a number of grass hosts that are commonly imported into the U. S. ScaleNet lists it from , and ; it is a pest of rice in some areas of the world (Willia1970DJ). ScaleNet distribution records for B.rehi include, Nearctic, Neotropical, Oriental and It is the only species of Brevennia that has been taken at U. S. ports-of-entry.