15. Pheidole umbonata Mayr,

Sitzungsb. k. Akad. Wiss. Wien 53 (1): 510, 1866; Zool. bot. Ges. Wien, Verh. 20: 978, 1870.

Wheeler, B. P. Bishop Mus., 0cc. Papers 11 (11): 19, 1935.

Mt. Tenjo, May 3, under stones, Swezey; Machanao, May 4, 16, in moss, Swezey; Tumon, May 30, under bark, Usinger; Piti, July, Swezey; Barrigada, July 6, 22, Swezey; Yigo, Nov. 13, Swezey.

This dark brown ant is widespread in the Pacific islands from Marquesas, Tahiti, Samoa, Fiji, Tonga, New Caledonia, New Britain, Solomons and Papua. Now recorded from Guam for the first time. We found it widely distributed, and the most abundant of the species of Pheidole in Guam. Determination by M. R. Smith.