178 SIPPLEMENT TO 



Savi* under the name of Gryllus wyrmecopliilus. He 

 detected it in the nests of several species of ants in 

 Tuscany, where it lived on the best terms with its 

 hosts, playing round their nests in warm, and retiring 

 into them in stormy weather, while allowing the 

 ants to carry it from place to place during their 

 migrations. 



Gryllus myrmecophUus has also been observed in 

 nests of the turf ant {Tetramor'mm caspitum) near 

 Paris, f 



At Mentone I have never found more than this 

 one specimen, and the ants among which it was 

 domiciliated were of a species new to me {Camponotus 

 {Formico) lateralis, Oliv.). This colony of ants was 

 composed of many winged males and females, as well 

 as workers, the last-named measuring from tv/o and a 

 half to three lines in length, and black in colour. In 

 other colonies I have found the workers black, with 

 red head and thorax. 



Another ant, not enumerated in my list in Ants 

 and Spiders, is Campwnolus {Formica) sylvatica, which 

 I detected in March last under stones on Cap Martin, 

 near Mentone. When disturbed, this ant runs along 

 with its abdomen raised vertically in the air, much as 

 the devil's coachhorse {Staphylinus) does. The same 

 curious habit of erecting the abdomen is found in 

 another ant, not uncommon in decaying wood in the 

 South, Crematoyaster scitteUaris ; and probably all 

 three insects adopt this threatening attitude, which is 

 that of the scorpion preparing to strike and sting, in 



* Dr. P. Savi, Osservazione sopra la Blatta acervorum di Panzer in 

 Bihliotheco Ttaliann, toiii. xv. p. 217. 

 t Bullttia Soc. Entom. de France (1872), p. li. 



