Thecabius gravicornis
The inducer of this gall is unknown or undescribed.
Hosts: Populus angustifolia / Populus balsamifera
Detachable: integral
Color: yellow, green
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Abundance:
Shape:
Season: Summer, Spring
Related:
Alignment:
Walls:
Location: leaf midrib, between leaf veins
Form: leaf curl, pocket
Cells:
Possible Range:i
Common Name(s):
Synonymy: 
Our ID Notes may contain important tips necessary for distinguishing this gall from similar galls and/or important information about the taxonomic status of this gall inducer.
Aphids of the Rocky Mountain region
“
Thecabius gravicornis (Patch)
Pseudo Galls. Fundatrix in small pocketlike swelling on upperside of leaf about halfway between midrib and edge of leaf, opening on under side; progeny on underside of leaves which are folded downwards together on midrib.
Collections. As winter host on Populus tacamahaca, in folded leaf pseudo galls. Colorado: Pennock Pass (above Masonville), Steamboat Springs and at Red Feather. Fundatrices Aug. 24, alate fundatrigeniae Aug. 18 and 24; rare, perhaps on account of rarity of host.
”- Miriam Palmer: (1952) Aphids of the Rocky Mountain region©
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