Biological Paper's. 129 



A PARTIAL KEY TO THE GENERA OF NORTH 

 A3IER1CAN JASSOIDEA. 



S. E. Crumb. 

 (By permission of the Chief of the Bureau of Entomology. ) 



THE hemipterous group Jassoidea includes such Homoptera as 

 have mauy spines on the hind tibijB and also have the antennae 

 itiserted between the eyes. 



Because of their abundance, the increasing recognition of their 

 economic importance, and the lack of knowledge concerning the 

 distribution, habits and life histories of the greater number of the 

 species, these interesting insects deserve more general study. The 

 present paper is to some degree tentative and experimental, but is 

 offered in the hope that it may be of use to students in arranging 

 their material. The subfamily Athysaninse, in the Acocephalidse, 

 and the family Typhlocybidee are not treated. 



Literature on the genera and higher groups of America north of 

 Mexico has appeared as follows : 



Mr. Wm. H. Ashmead (Ent. Amer., v. 5, July, 1889) and Mr. 

 E. P. Van Duzee (Ent. Amer., v. 5, Sept. 1889) each published a 

 key to the genera of Bythoscopida? from Edwards' "Synopsis of 

 the British Cicadinee." Prof. Chas. W. Woodworth ( Psyche, v. 5, 

 pp. 211-214, July, 1889) gave a synopsis of the genera of Typhlo- 

 cybidae (Typhlocybini). Mr. Van Duzee (Trans. Am. Ent. Soc, 

 v. 19, pp. 295-307, 1892), in his well-known "Synopsis," gives keys 

 to the families and to the genera of Acocephalidse (Jassidae). 

 Prof. C. F. Baker (Psyche, v. 8, p. 76, 1892) erected the family 

 Ka3belidtT3 (Koebeliin*). Prof. C. P. Gillette (Proc. U. S. Natl. 

 Museum, v. 20, pp. 709-773, 1898) monographs the Typhlocybidse 

 (Typhlocybina?), and Dr. E. D. Ball (Proc. Iowa Acad. Sci., v. 8, 

 1901) has done the same for the Tettigoniellidae (Tettigonidie) in 

 part. Prof. Herbert Osborn (Bull. 97 N, Y. State Museum, p. 500, 

 1905 ) gives a key to the families. 



The late Dr. F. H. Snow and Prof. S. J. Hunter of the University 

 of Kansas, by their kindness and cooperation made this paper pos- 

 sible. Much of its completeness is due to work done in the Na- 

 tional Museum, through the courtesy of Dr. L. O. Howard and 

 Messrs. J. C. Crawford, jr., Otto Heidemann, W. D. Hunter, and 

 A. C. Morgan. To all these, and to those who by gifts of material 

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