Literature references
1 literature reference for Therion occidentale (Cresson, 1879):
| Author: | Cresson, E.T. |
|---|---|
| Year: | 1879 |
| Title: | Description of Ichneumonidae, chiefly from the Pacific slope of the United States and British North America. |
| Source: | Proceedings of the Academy of Natural Sciences of Philadelphia. 30(1878):348-381. |