[Neolasioptera] willistoni. USA (California, Arizona, New Mexico). Atriplex canescens; A. polycarpa (Chenopodiaceae).
Lasioptera willistoni Cockerell 1898: 327. USA: New Mexico, Mesilla Park; LT, des. Gagné & Hawkins 1983: 380; L; USNM.

Stem Gall Midge
Neolasioptera willistoni

There are two forms of these galls: one occurs near the tip of fruit-bearing branches, is somewhat fissured, and has an abrupt base; the second is a smooth, gradually tapered stem-swelling.

Hosts:
Atriplex canescens, Atriplex hymenelytra, Atriplex polycarpa

Range:
NM, CA

Atriplex (saltbush)
...
galls on Atriplex canescens
...
simple nonleafy enlargements of stem
...
swelling gradual, tapered or cylindrical, woody...Lasioptera tibialis Felt and Neolasioptera willistoni (Cockerell)
...
N. willistoni. Galls are either terminal, hard, ridged, and situated at tips of fruit-bearing branches, or smooth, softer, and on vegetative stems. Usually only one larva occupies a gall...Hosts: A. canescens, A. polycarpa.

Atriplex (saltbush)
...
1a. Galls on Atriplex canescens...2
...
2a. Simple nonleafy enlargements of stem...3
...
3a. Swelling gradual, tapered or cylindrical, woody...Lasioptera tibialis Felt and Neolasioptera willistoni (Cockerell)
...
N. willistoni. Galls are either terminal, hard, ridged, and situated at tips of fruit-bearing branches, or smooth, softer, and on vegetative stems. Usually only one larva occupies a gall...Hosts: A. canescens, A. polycarpa.