Pemphigus longicornus Maxson

Galls are elongate, thin-walled, on upper sides of leaves of Populus deltoides. The fundatrix is pale yellowish white. Alatae (BL 1.7-2.1 mm) emerge in May-June and migrate to an unknown secondary host (Maxson 1923). In eastern and southern USA. [According to Smith (1985), there is also an undescribed Pemphigus sp. on P. deltoides in North Carolina that causes elongate to slightly globular galls on the upper sides of the leaves, and has alatae with antennae intermediate in length and antennal sensoriation between longicornus and populivenae.]

Pemphigus longicornis Maxson, n. sp.

The galls are quite similar in form to those produced by Tetraneura graminis only less notched at top and less ribbed on sides. Walls thin. Length of large galls about five-eighths inch, height about one-half inch. From side to side they measure about three-sixths inch. Slightly constricted where attached to leaf. Placed on upper side of leaves of Populus deltoides.

Type locality: College Station, TX