BioStor
 | Two undescribed pediciine crane-flies from the United States (Tipulidae, Diptera) C P Alexander (1920) Canadian Entomologist 52: 78-80 |
 | Two new species of Aphididae from Japan R Takahashi (1920) Canadian Entomologist 52: 77-78 |
 | Diptera of the superfamily Tipuloidea found in the District of Columbia C P Alexander and W L Mcatee (1920) Proceedings of the United States National Museum 58: 385-435 |
 | Catalogue of Oriental and South Asiatic Nemocera E Brunetti (1920) Records of the Indian Museum 17: 1-300 |
 | A list of the crane-flies taken in the vicinity of Hazleton, Pennsylvania (Diptera) W G Dietz (1921) Transactions of the American Entomological Society 47: 233-268 |