322 
Psyche 
[Vol. 87 
Summary 
The Palearctic species Chelostoma campanularum and fuligino- 
sum have recently become established in central New York State. 
Mitchell’s key to eastern U. S. megachilid genera is revised to 
include Chelostoma. They are distinguished from similar New York 
Megachilidae ( Prochelostoma and Hoplitis) by the shape of meta- 
somal tergum VII of the males and the clypeal apex of the females. 
Both species are oligolectic on bellflowers, Campanula, and con¬ 
struct nests in pre-existing cavities, primarily in old wood. Nine 
exotic species of megachilid bees have become established in North 
America, of which four 4 are known only from New York State. 
Acknowledgements 
I thank my associates at Cornell University, especially Dr. 
Howard Ginsberg, Ms. Barbara Kurtak, and Dr. L. L. Pechuman, 
for collecting specimens of Chelostoma. Mr. G. van der Zanden of 
Eindhoven, the Netherlands, confirmed my determinations of the 
species. Dr. Paul D. Hurd, Jr., of the U. S. National Museum of 
Natural History critically read the manuscript. Portions of this 
research were supported by National Science Foundation grant 
number DEB-78-03151. 
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