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The photo shows to bees of the genus Lasioglossum (Halticinae). Normally, a species recognition by foto is difficult or impossible, but in this case it may be a Lasioglossum sexcinctus (or a closely related species). A special character are the dense apical bands on terga, which are uncommon in Lasioglossum. But this identification is only an idea, and not a 100% identification.
best regards, Christian Schmid-Egger
www.bembix.de