PREFACE. 



The manuscript and notes for this final volume of my husband's (Alpheus Spring Packard) 

 Monograph of the Bombycine Moths are printed, with the exception of editorial additions, 

 exactly as he left them at the time of his death on February 14, 1905. He had been working 

 on them during the leisure intervals of college duties, and it was one of the last wishes he 

 expressed that the National Academy of Sciences might consent to print the unfinished part, 

 since they had already printed Parts I and II. My husband was fully aware of the incomplete 

 condition of this later part, and had expected to spend much time in finishing it; he had also 

 hoped to revisit the British Museum in order to work from the types in the collections there. 



My husband's scientific friends who have been consulted in regard to printing have agreed 

 that although these parts are incomplete, yet the valuable results of so many years of labor 

 should be put into accessible and permanent form. 



The accomplishment of this purpose is due above all to the labors of Prof. Theodore D. A. 

 Cockerell, of the University of Colorado, who has most generously given Ids time to editing this 

 volume. Without his kind and able assistance there would have been further delay of publi- 

 cation. I must leave to Prof. Cockerell all acknowledgments to those who have kindly helped 

 him by supplying illustrations, etc. Our obligations are great to both Dr. Samuel Henshaw, 

 of the Museum of Comparative Zoology, and to Miss Caroline G. Soule, of Brookline. We 

 must ask my husband's many friends who furnished him so generously either with specimens or 

 the results of their own observations to realize that through ignorance we can not make the 

 proper acknowledgments, as he would have been careful to do. 



Elizabeth Walcott Packard. 



Andover, Mass., July, 1912. 



