Produced by Larry B. Harrison and the Online Distributed Proofreading Team at https://www.pgdp.net _Bees from British Guiana_ BY T. D. A. COCKERELL BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY VOL. XXXVIII, ART. XX, pp. 685-690 _New York, December 21, 1918_ 59.57.99(88) #Article XX.#--BEES FROM BRITISH GUIANA BY T. D. A. COCKERELL. In connection with the work of the Tropical Research Station of the New York Zoological Society, conducted by Mr. William Beebe, collections of insects, including bees, were made. The present report deals with a series of bees from the Bartica District, and Mr. John Tee Van, in forwarding them, states that "almost all of these bees were procured about a clump of several species of nightshades (_Solanum_), which were flowering in thinned-out jungle." I give an artificial key, which will enable one who is not a specialist in bees to separate readily each species from the rest. It will, of course, remain necessary to compare any species with a fuller account to make sure that it is not some form unrepresented in the present collection. The types of the new species and varieties from British Guiana are deposited in The American Museum of Natural History. Species marked P. are from the Penal Settlement; those marked K. occur at Kalacoon. The body, or some part of it, brilliant green 1. No part of the body brilliant green 11. 1. Thorax dark, with more or less purple tints, not bright green 2. Thorax bright or clear green, at least in part 4. 2. Small bee, less than 10 mm. long _Augochlora callichlorura_, new species. Large, robust bees, greatly exceeding 10 mm. 3. 3. Abdomen with the first two segments dark; tongue not extending to end of abdomen _Eufriesia pulchra_ (Smith). Abdomen all bright green, with brassy tints; tongue extending backward far beyond tip of abdomen _Euglossa brullei_ Lepeletier. 4. Hind margins of abdominal segments broadly black. _Augochlora nigromarginata_ (Spinola).--P. Hind margins of abdominal segments green 5. Hind margins of abdominal segments red or whitish; very robust bees 10. 5. Small bee, less than 10 mm. long, the clypeus with a transverse apical ivory-colored band _Ceratina læta_ Spinola. Larger, very robust bees 6. 6. Tongue extending beyond abdomen posteriorly 7. Tongue not extending beyond abdomen 8.