5. Hylaeus guamensis (Cockerell) .

Prosopis guamensis Cockerell, Ann. Mag. Nat. Hist. VIII, 14: 4, 1914.

Sumay Road, June 23, Swezey.

Both sexes were reared from nests in a soft-rotten branch of a reel-flowered mangrove tree ( Lmnnitzera pedicellata) but this was the only occasion on which the species was found. My original male was headless; it may now be stated that the clypeus is nearly all yellow, but the yellow is strongly notched or bilobecl above; the band-like lateral face marks, about twice as broad below as above, extend along the inner orbits halfway up sides of front; labrum brown with a small yellowish mark; mandibles black with some reel sub-apically; scape yellow in front; flagellum dull ferruginous beneath. In one of the females, the face lacks the lateral marks.