490 PROCEEDESTGS OF THE NATIONAL MUSEUM vol. n4 



Bequaert (Museum of Comparative Zoology, Cambridge, Mass.); 

 Andreas (Andrew) Bolter Collection (recently transferred from De- 

 partment of Entomology, University of Illinois, to Illinois State 

 Natural History Survey, Urbana); C. S. Brimley (North Carolina 

 Department of Agriculture, Raleigh) ; A. E. Brower (Augusta, Maine) ; 

 A, B. Champlain (Bureau of Plant Industry, Department of Agricul- 

 ture, Harrisburg, Pa.); J. F. Gates Clarke (U.S. National Museimi, 

 Washington, D.C.) ; J. R. Dymond (Royal Ontario Museum of Zool- 

 ogy, Toronto); J. R. Eyer (New Mexico College of Agriculture and 

 Mechanic Arts, State College) ; W, T. M. Forbes and Henry Dietrich 

 (Cornell University, Ithaca); W. J. Gerhard (Chicago Museum of 

 Natural History); M. O. Glenn (Magnoha, 111.); H. E. Jaques (Iowa 

 Wesleyan College, Mount Pleasant) ; A. B. Klots and W. P. Comstock 

 (American Museum of Natural History, New York) ; J. N. KnuU (Ohio 

 State University, Columbus) ; A. W. Lindsey (Denison University, 

 Granville, Ohio) ; Clay Lyle (Mississippi Agricultural and Mechanical 

 College, State College); C. E. Mickel (University of Minnesota, St. 

 Paul); H. I. O'Byrne (Glencoe, Mo.); M. A. Pahner (Colorado State 

 College, Fort Collins); E. S. Ross and Mrs. Barbara Prendergast 

 (California Academy of Sciences, San Francisco); H. H. Ross (Ilhnois 

 State Natural History Survey, Urbana); M. E. Smith (Massachusetts 

 State College, Amherst); D. B. StaUings (Caldwell, Kans.); W. R. 

 Sweadner (Carnegie Musemn, Pittsburgh, Pa.); H. D. Tate (Univer- 

 sity of Nebraska, Lincoln); B. H. Walden (Agricultural Experiment 

 Station, New Haven, Conn.) ; L. P. Wehrle (Agricultural Experiment 

 Station, Tucson, Ariz.); A. K. Wyatt (Chicago, 111.). Especially 

 large series were received from the American Museum of Natural 

 History (538 specimens), Cornell University (538 specimens), and the 

 Cahfornia Academy of Sciences (323 specimens) . 



The writer wishes to acknowledge the suggestion of the original 

 problem by the late Messrs. Carl Heinrich and August Busck of the 

 U.S. Department of Agriculture. When the writer eventually visited 

 the U.S. National Museum in spring of 1951 to study type specimens. 

 Dr. J. F. Gates Clarke was most helpful in dissecting a number of 

 the types and in offering valuable suggestions regarding several 

 problems that had arisen during the course of work. Mr. W, H. T. 

 Tams, of the Department of Entomology at the British Museum 

 (Natural History), very kindly sent excellent photographs of the 

 type material of the North American Acrolophidae possessed by 

 that institution. These photographs represented both the pinned 

 specimens and slide preparations of their genitalia. Lastly, the 

 writer expresses his thanks to Dr. E. P. Darlington for tabulating 

 and sending a descriptive list of the pertinent types in the collection 

 of the Academy of Natural Sciences of Philadelphia. 



