BioStor
 | The Mexican snakes of the genera Sonora and Chionactis with notes on the status of other colubrid genera W H Stickel (1943) Proc. Biol. Soc. Wash 56: 109-128 |
 | The shovel-nosed snake, Chionactis with descriptions of two new subspecies Laurence M Klauber (1951) Transactions of the San Diego Society of Natural History 11: 141-204 |
 | Type specimens of reptiles and amphibians in the United States National Museum (1961) Bulletin of the United States National Museum 220: 1-291 |