GREEN GRASSHOPPERS (LOCUSTID^). 155 



of defence. For some, like the Phasmidae, there is a 

 more direct safeguard than mimicry. The Algerian 

 E ug aster guy onii, if seized, ejects two jets of an orange- 

 coloured caustic liquid from two pores situate on the 

 sides of the mesosternum, and behind the coxae of the 

 front legs. A second, though feebler, discharge can be 

 made, and sometimes a third ; but then it has generally 

 exhausted its store, and some time must elapse ere it 

 has the defensive fluid again at command. This species 

 may sometimes be heard making a low, brief sound, 

 unlike ordinary forms of stridulation. 



Some Locustidae present a resemblance to Phasmidee ; 

 this, however, has only been found in a few species. 

 The long slender form and hind legs and long narrow 

 tegmina give Prochilus australis a great resemblance 

 to some of the winged Phasmidse ; while another 

 Locustid, native to Australia, from its long and linear 

 body and the entire absence of alar organs, looks like 

 an apterous Walking-Stick. Saussure calls attention to 

 the slender stick-like forms in the genus Peringueyella 

 of South Africa. This genus belongs to the tribe 

 Sagides ; and, at first sight, one might almost mistake 

 their extraordinary appearance for that of some 

 Tryxalides. 



