1983] Blondehim & Frankenherg — Sounds of Grasshopper 393 
Y.L. Werner, J. Camhi, S. Friedman, E. Nevo and S. H. Blondheim 
for helpful comments on the manuscript. We also thank Prof. Y.L. 
Werner for making the inmates of the vivarium available for these 
experiments; and P. Amitai who drew the figure. Partial support to 
EF by the Center of Absorption in Science of the Ministry of 
Absorption is acknowledged with thanks. 
Summary 
Mandibular sounds produced by the grasshopper Pareuprepoc- 
neniis syriaca Giglio Tos, when seized, appear to reduce predation 
on it by a probable natural predator, Ptyodactylus hasselquistii 
guttatus von Heyden, an insectivorous gecko. Sound-producing 
grasshoppers which had been silenced by treatment in the labora- 
tory, untreated sound-producing grasshoppers, and silent Locusta 
migratoria migratorioides nymphs were introduced simultaneously 
to the geckos. Survival of normal, sound-producing P. syriaca far 
surpassed that of both controls. 
BiHI lOGRAFIlV 
Ai.kxandfr. R. D. 
I960. Communicative mandible-snapping in Acrididae. Science 132 : 152-3. 
Bauhr, I. 
1976. Experimente zur Frage der biologischen Bedeutung des Stridulations- 
verhaltens von Kafern. Z. Tierpsychol. 42 : 57 65. 
Biirni i r. E. R., T. B. Wright and E. D. Brown 
1981. On the functions of stridulation by the Passalid beetle Odontotaenius 
(iisjuncms (Coleoptera:Passalidae). Animal Behavior 29 : 483-486. 
Fabhr, a. 
1949. Fine Bischer unbekannte Art der l.auterzeugung europaischer Orthop- 
teren: Mandibellaut von Callipianws iialicus. Z. Naurforsch 46 : 367-9. 
Frankknberg, E. 
1979. Influence of light and temperature on daily activity patterns of 3 Israeli 
forms of Ptyodactylus (Reptilia: Gekkoninae). . 1 . Zool. Lond. 185 : 
21-30. 
EIaskfi I , P. T. 
1974. Sound Production in The Physiology of Insecta, Second ed. 354-405. 
M. Rockstein, ed.. Academic Press. 
Henry, G. M. 
1942. Three remarkable stridulatory mechanisms in Acrididae (Orthop). Proc. 
Roy. Ent. Soc. Series A 17 : 59-62. 
Marler, P. 
1957. Specific distinctiveness in the communication signals of birds. Behaviour 
11 : 13-39. 
