Abstract
The writer wishes to express his sincere thanks to those who have contributed to the success of this work by allowing him the use of their collections. Among these should be mentioned first Prof. Herbert Osborn who allowed the use of his private collection as well as that of the Ohio State University. Prof. Comstock sent the collection belonging to Cornell University, and Mr. Heidemann of the National Museum sent his private collection of several hundred specimens. The collection belonging to the Colorado Agricultural College was also at the writer’s disposal. Without this extensive material, it would have been impossible to arrive at many definite conclusions concerning the genus.
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