[As Callachna gibba]

Redescribed from four males and two females reared in April, 1889, at Lafayette, Ind., by F. M, Webster, from galls on Ambrosia artemisiaefolia; two males and two females reared at Kirkwood, Mo., April, 1887, "from aggregated gall on Ambrosia" by Miss Mary E. Murtfeldt; 14 specimens of both sexes reared at Sioux City, Iowa, April, 1922, from " polythalamous gall on weed";