Planiceps diverticulus Fox, 1897:262, ♀. 2 ♀♀, Chapada, April, September. - Fox, 1897Fox, W.J. 1897. Contributions to a knowledge of the Hymenoptera of Brazil, No. 2. - Pompilidae. Proceedings of the Academy of Natural Sciences of Philadelphia 49:229-283.:264 (key [key to Brazilian species]); Bradley, 1944Bradley, J.C. 1944. A preliminary revision of the Pompilinae (exclusive of the tribe Pompilini) of the Americas (Hymenoptera: Pompilidae). Transactions of the American Entomological Society 70:23-157.:108 ( listed as synonym of Cosmiaporus diverticulus (Fox, 1897)); Pate, 1946Pate, V.S.L. 1946. The generic names of the spider wasps (Psammocharidae olim Pompiloidae) and their type species. Transactions of the American Entomological Society 72:65-137.:81 ( listed as synonym of Cosmiaporus diverticulus (Fox, 1897)). - As Aporus diverticulus: - Evans, 1973Evans, H.E. 1973. Studies on Neotropical Pompilidae (Hymenoptera) VIII. The genus Aporus Spinola in South America. Studia Entomologica 16 (fasc. 1-4):353-370.:369 (comb. nov.); Castro-Huertas et al., 2014Castro-Huertas, V., J.P. Pitts, J. Rodriguez, C. Waichert & F. Fernández 2014. New records of spider wasps (Hymenoptera, Pompilidae) from Colombia. ZooKeys 443:35-44. (distribution); Fernández et al., 2017Fernández, F., V. Castro, J. Rodríguez, C. Waichert & J.P. Pitts 2017. Avispas cazadoras de arañas de Colombia (Hymenoptera: Pompilidae). Proceditor Ltda., Bogotá, D. C., Colombia. (distribution); Fernández et al., 2022Fernández, F., J. Rodriguez, C. Waichert, B. Decker & J. Pitts 2022. Twenty two years later: An updated checklist of Neotropical spider wasps (Hymenoptera: Pompilidae). Zootaxa 5116 (4):451-503. (distribution).