A REVIEW OF THE LEAFHOPPERS OF THE GENUS 

 GYPONA NORTH OF MEXICO. 



By Edmund H. Gibson, 



Custodian of Remiptera, United States National Museum. 



The genus Oypona represents a group of leafhoppers that is more 

 or less weli known to all collectors of msects and especially to those 

 who frequently have occasion to "sweep" or "beat" trees, bushes, 

 cultivated plants and crops, and weeds. They often occur in con- 

 siderable numbeis in limited areas, assuming the proportions of a 

 concentrated outbreak, and hence their economic importance is 

 brought to attention. 



The common large green species occiu* in most all collections of 

 Homoptera, but in the majority of instances have been wrongly 

 identified. The species are, however, quite easy to separate, and 

 with the following key and short treatises upon the species the gen- 

 eral entomologist should experience no difficulty in making correct 

 determinations. It must, however, be said that the key is purely 

 artificial and should be taken as a guide to, rather than positive 

 means of, identification. 



Eight species are herein described as new, making a total of 33 

 that are known to occm in North America north of Mexico. A much 

 larger number of species are distributed throughout Central and 

 South America. The genus is also represented in the Palaearctic, 

 Ethiopian, Oriental, and Australian regions. 



The genus was described by Germar in 1821. Since that time 

 St&i in 1858 and J. Spanberg in his excellent treatises of the genus 

 in 1878 and 1881 have added the most to our knowledge of the 

 group. 



The author has deemed it wise to omit a full description of each 

 species, since the majority of species were described in available 

 pubhcations and in most cases in good detail. It is believed that a 

 comparison of species will be of gieater value, for identification pur- 

 poses, than lengthy, minute descriptions which primarily "fill up 

 space" and in this particular group of insects might tend towards 

 confusion. 



Proceedings U. S. National Museum. Vol. 56— No. 2289. 



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