6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no 



SO in those cases only limital and representative localities are shown. 

 Tegmen (front wing or elytron) length is subject to inconsistencies 

 unless a standard measurement is taken. Thus, it is measured "from 

 the distal extremity of the tubercle formed by the junction of the 

 subcostal and radial veins" (Proc, 4th Internat. Locust Conference, 

 Cairo, p. 97, 1937) (also see Dirsh, 1953, for a treatment of standard 

 measurements). We have tried to select specimens with tegminal 

 apices intact, thus avoiding diflBculties encountered when the tip of 

 the tegmen is frayed (see Kamchandra Rao, BuU. Ent. Res., vol. 33, 

 pp. 247-249, 1942). 



Acknowledgments 



Most of the type specimens are located in the Museum of Compara- 

 tive Zoology (MCZ) , the Academy of Natm-al Sciences of Philadelphia 

 (ANSP), and in the U. S. National Museum (USNM). We are much 

 indebted to J. A. G. Rehn (of ANSP) and P. J. DarHngton (of MCZ) 

 for the privilege of studying the historical material in their charge, 

 as well as for loans of important series from those collections. The 

 courtesies extended by Mr. Rehn and by his colleague, Harold J. 

 Grant, Jr., on several visits to Philadelphia by the senior author, are 

 much appreciated. It has been especially helpful to examine many 

 of the specimens preserved there which were studied by the late 

 Morgan Hebard. To the following curators we would acknowledge 

 deep appreciation for the loan of critical types or information about 

 them: Max Beier (Naturhistorisches Museum, Vienna); N. M. 

 Comeau (Musee de la Province, Quebec) ; Charles Ferriere (Museum 

 d'Histoire NatureUe, Geneva) ; and David R. Ragge (British Museum). 

 Other entomologists to whom we are very grateful for important loans 

 are: T. H. HubbeU (University of Michigan); George P. Holland 

 (Canadian National Collection, Ottawa); E. S. Thomas (Ohio State 

 Museum) ; Henry Dietrich (Cornell University) ; S. W. Frost (Penn- 

 sylvania State University); John R. HUliard (University of Texas); 

 F. W. Werner (University of Arizona); Edwin W. King (Clemson 

 Agricultural College) ; R. E. Pfadt (University of Wyoming) ; George 

 E. Wallace (Carnegie Museum); Paul D. Hurd (University of Cali- 

 fornia); Neely Turner (Connecticut Agricultural Experiment Sta- 

 tion); H. V. Weems (Florida Plant Board); B. B. Pepper (Rutgers 

 University); R. D. Bird (Dominion Entomological Laboratory, 

 Brandon, Manitoba) ; Frank T. Cowan, J. R. Parker and Fred Skoog 

 (U. S. Department of Agriculture, Bozeman, Mont.); 0. L. Barnes 

 (U. S. Department of Agriculture, Tempe, Ariz.). 



Several other entomologists have cooperated in supplying informa- 

 tion or other help, and acknowledgment of their assistance appears 

 in our discussion of the various species. 



