Phylloxera tuberculifera Duncan
Apterae (BL c. 0.5 mm, colour unrecorded) caused brown spots on undersides of leaves of Quercus havardii in Texas, USA, in August (Duncan 1922). Other morphs and life cycle are unknown.
”- Roger Blackman, Victor Eastop: (2013) Aphids on the world's plants©
Reference: http://www.aphidsonworldsplants.info/d_APHIDS_P.htm#Phylloxera