Shapley, H. 1920a. Note on pterergates in the Californian harvester ant. Psyche (Cambridge) 27:72-74. PDF

Notes: Stamp date in MCZ library: 1920.09.18.

Shapley, H. 1920b. Preliminary report on pterergates in Pogonomyrmex californicus. Proceedings of the National Academy of Sciences of the United States of America 6:687-690. PDF
Sharaf, M. R. 2007b. [Untitled. New species attributed to Sharaf.]. Pp. 237-244 in: Fadl, H. H.; Bakr, R. F.; Badawy, R. M.; Sharaf, M. R. 2007. Six new species of ants (Insecta: Hymenoptera: Formicidae) from Egypt. Proceedings of the Second International Conference of the Entomological Society of Egypt 1:235-249. PDF