4. Lithurgus guamensis Cockerell,

Ann. Mag. Nat. Hist. VIII, 14: 1, 1914.

Tarague Beach, on cotton flowers, May 17, Swezey; Machanao, June 30, community nest in large, partly rotten breadfruit stump, with dozens of bees nesting in easily excavated wood, Usinger, Swezey; Orote Peninsula, Sept. 27, Swezey ; Yigo, May 19 , Oct. 18, Swezey .