Abstract
THE ISOLATING VALUE OF SPECIFIC SONG PATTERNS IN TWO SIBLING SPECIES OF GRASSHOPPERS (CHORT- HIPPUS BRUNNEUS THUNB. AND C. BIGUTTULUS L.) by A. C. PERDECK (Rijksmuseum van Natuurlijke Historie, Leiden; Instituut voor Oecologisch Onderzoek, Arnhem, Holland) (With 9 Figures) (Rec. 10-V-1957) CONTENTS Page I Introduction .............. 2 II Degree of isolation ............ 5 i. Morphological characters (C. rraollis Charp. included) .... 5 2. Differences in the song patterns ........ 8 3. Hybridisation in nature ..... , ..... 15 5 4. Notes on geographical variation; Chorthippits brunneus brevis Klingstedt 18 5. Remarks on the relation between the structure of the sound
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