In Ent. News, Vol. III, p. 104 (1892), the following brief notice by Mr. Wm. H. Patton occurs: "Thynnus in California. This genus has not hitherto been found north of the equator in either hemisphere, nor has any of the family Thynnidae. A single specimen received from Dr. F. E. Blaisdell, from Poway, San Diego County, Cal., is the first intimation of its occurrence in North America. It is a small black species with hyaline wings and may be named Thymms californicus.''
Ashmead, William H., "Thynnidae in the United States" (1898). An. Paper 66.