NO. 3581 BALCLUTHA — BLOCKER d 



shape of the posterior margin of the abdominal sternum VII. This 

 structure separates several taxa within the Balcluthini, but there is 

 much variation; hence, its use is supplementary. 



The author is indebted to Professor David A. Young of North 

 Carolina State University at Raleigh, who suggested this stud}?- and 

 made several suggestions. Dr. Paul H. Freytag and Dr. James P. 

 Kramer provided study facilities at Ohio State University and the 

 U.S. National Museum, respectively, during visits to these institutions 

 and made useful suggestions. Dr. S. L. Tuxen of Copenhagen, Den- 

 mark, has been most cooperative in answering questions concerning 

 Fabrician type material. 



Individuals and institutions who lent specimens were: Dr. D wight 

 M. DeLong of Ohio State University, specimens from his personal 

 collection; Dr. Ju^i Dlabola, the National Museum of Natural History, 

 Prague, Czechoslovalda; Dr. Paul H. Freytag and Dr. C. A. Triple- 

 horn, Ohio State University; Dr. T. Ishihara of Japan, personal collec- 

 tion; Dr. James P. Kramer, U.S. National Museum; Dr. Jean L. 

 Laffoon, Iowa State University; R. Linnavuori of Finland, personal 

 collection; Dr. George W. Byers, Snow Entomological Museum, Uni- 

 versity of Kansas; Dr. W. R. Richards, Canadian National Collection; 

 Dr. Edward S. Ross, California Academy of Science; Dr. Jerome G. 

 Rozen, American Museum of Natural History; Dr. A. So6s, Hungarian 

 Natm-al History Museum, Budapest, Hungary; Miss Amy Suehiro, 

 Bernice P. Bishop Museum; Dr. H. Weidner, Zoological Museum, 

 Hamburg, West Germany; Dr. C. J. Davis, Hawaiian Department of 

 Agriculture; Dr. G. G. E. Scudder, University of British Columbia; 

 Dr. Jerry A. PoweU, University of California at Berkeley. 



Tribe Balcluthini Baker 



Tribal nomenclature. — Baker (1915) proposed the name Bal- 

 cluthini as a replacement name for Gnathodini, the generic name 

 Baldutha Kirkaldy having earlier replaced Giiathodus Fieber, which 

 was preoccupied. 



Description. — Slender leafhoppers; variable in size; head from 

 slightly wider than to distinctly narrower than pronotum; vertex 

 from as long next to eye as medially, to distinctly longer medially; 

 interocidar width approximately three times median length; ocelli 

 usually small, variable in their distance from adjacent eye; anteclypeus 

 parallel margined or slightly wider apically; postclypeal sutures 

 extending weU past antennal pits to ocellocular area; transclypeal 

 suture arched so that basal margin of anteclypeus is convex; gena 

 slightly notched next to eye, joining anteclypeus as a very narrow 

 band. 



