XVI. Monor/raph of the Britisli species belonging to the 

 Hemiptera-Homoptera,/«»<?'/y Psyllidte; together 

 xoith the description of a genus ichicJi may be ex- 

 pected to occur in Britain. Bj John Scott. 



[Read 1st March, 187G.] 



I HAVE been induced to undertake the present Monograph 

 for two reasons, viz. : first, because such a thing has not 

 previously been attempted, and I therefore thought it 

 desiral)le for the sake of science to bring together and de- 

 scribe all those species in my own collection as well as 

 those in the collections of others which have been kindly 

 lent for this purpose; secondly, because the Catalogue now 

 in course of publication by the Entomological Society of 

 London will thus be rendered more complete. I have also 

 added translations of the original descrij^tions of some 

 species which I have not seen, but which were taken by 

 Messrs, Haliday and Walker, and forwarded to Dr. Forster 

 at Aix, where they appeared in the " Verhandlungen des 

 naturhistorischen Vereins der preussischen Rheinlande " 

 for 1848. That author's generic divisions are natural and 

 easy of recognition, but his diagnoses of the various 

 species are meagre in the extreme, and, in many instances, 

 not sufficient to lead to their identity. The same remarks 

 also apply to the descriptions of JMeyer-Diir, published in 

 the "Mitthcilungen der schweizerischen entomologischen 

 Gesellschaft," vol. iii. On the other hand. Dr. Flor, in his 

 " lihynchoten Livlands," vol. ii., and in a paper published 

 at Moscow in 1861, under the title " Zur Ivenntniss der 

 lihynchoten," has more than compensated for the in- 

 completeness of the others by the elaborate descriptions he 

 there gives. He is pre-eminently the man in this group, 

 and his works have afforded me valuable assistance in 

 determinating between species Avhere I had any doubt. 

 I have followed other authors by placing this group where 

 it now stands, but I am not prepared to say that this is its 

 true position, as it possesses some points in common with 

 the true Cicadidce. 



TRANS. ENT. SOC. 187G.— PART IV. (dEC.) 



