The North American Ichneumon-flies of the Tribe Acoconitini

Holarctic Tribes of the Ichneumon-flies of the Subfamily Ichneumoninae (Pimplinae)

Results of the Yale Peruvian Expedition of 1911: Hymenoptera, Superfamilies Vespoidea and Sphecoidea

Japanese Sawflies in the Collection of the United States National Museum

Some New Hymenopterous Insects from the Philippine Islands

On a Collection of Tenthredinoidea from Eastern Canada

Chalcidids Injurious to Forest-tree Seeds: Volume 6

On Some Hymenopterous Insects from the Island of Formosa

New Sawflies in the Collections of the United States National Museum

Descriptions of New Species of Wasps in the Collections of the United States National Museum

H. Sauter's Formosa-Ausbeute. Chalastogastra (Hym.)

Notes on sawflies, with descriptions of new species

Descriptions of Thirteen New Species of Parasitic Hymenoptera and a Table to Certain Species of the Genus Ecphylus

New Parasitic Hymenoptera Belonging to the Tribe Xoridini

A Synopsis, and Descriptions of the Nearctic Species of Sawflies of the Genus Xyela, with Descriptions of Other New Species of Sawflies

Vespoid and Sphecoid Hymenoptera Collected in Guatemala by W.P. Cockerell

Studies in the Woodwasp Super Family Oryssoidea, with Descriptions of New Species

Synopsis of the Species of Sawflies Belonging to the Genus Dimorphopteryx

Collected Papers: Volume 3

Descriptions of Thirty-one New Species of Hymenoptera