Euura macgillivrayi

Gradual twig enlargement, length 30 mm, diameter 7 to 10 mm, on S luteosericea [exigua]

Euura macgillivrayi

Salix
Twig galls

Gradual twig swelling, length 3-5 inches

Euura macgillivrayi

Gall: on Salix luteosericea Rydb. [exigua]; a gradual enlargement of the twig about 30 mm. long.

Range: Boulder, Colorado, at the mouth of Boulder Canyon. Adults appearing early in May in the field, earlier in the laboratory (S. A. Rohwer). (Type locality.)