THE HEMIPTERA OF 2 SOWN CALCAREOUS GRASSLANDS .3. COMPARISONS WITH THE AUCHENORHYNCHA FAUNAS OF OTHER GRASSLANDS

The Auchenorhyncha faunas of contrasting grasslands seeded on chalk at Royston, Hertfordshire, were compared with those from a range of semi-natural and agricultural grasslands. The Royston fauna was most similar to that of Castor Hanglands, on oolitic limestone grassland, and less closely related to those of 3 established chalk grassland sites. The similarity of the Royston and Castor Hanglands (Cambridgeshire) faunas lay mainly in the predominance of Arthaldeus pascuellus at both sites. On the established chalk grassland sites other species, particularly Turrutus socialis, predominated. The species richness of the Royston fauna was not markedly lower than the richness of established sites, but resident species were fewer. All sites had similar numbers of multi- and bivoltine breeding species, but significantly fewer univoltine species bred at Royston. Comparisons of annual totals of Auchenorhyncha recorded showed grouping strictly by site. -Author