24-2 SYSTEMATIC ARRANGEMENT. 



Europe possess very few ; in the last mentioned con- 

 tinent, indeed, only two species occur, and they are 

 of comparatively small size, namely, Bacillus Rossht-s, 

 and B. Gatticus, natives of Italy and the southern 

 provinces of France. 



One of the species is said to have heen occasionally 

 used as an article of food, and is hence named 

 P. edule. The late Rev. Lansdown Guilding has 

 made us acquainted with the singular fact, that if 

 the larva or nymph of P. cornutum, happen to lose 

 one of its legs, it reappears after the first change of 

 skin following the accident, although it is always 

 smaller than the opposite limh of the same pair. 



PHASMA NECYDALOIDES. 



PLATE XI. 



Lat. Gen. Crust et Insect, torn. iii. p. 87. Fqbr. Stoll, PI. III. 

 fig. 8; and PI. IV. fig. 11. 



THIS conspicuous insect affords a good example of 

 the genus Phasma, as it has heen restricted by Ser- 

 ville and St. Fargeau. According to these authors 

 it is characterized hy having the first joint of the 

 antennse cylindro-conic ; the second globular ; three 

 large ocelli; the body cylindric, always provided 

 with wings and tegmina (in both sexes) ; the thighs 

 and tibiae linear and simple. The general colour of 

 P. necydaloides is greyish-yellow ; eyes red ; thorax 

 with pointed tubercles ; abdomen and posterior legs 

 cinereous; the incisures and articulations brown. 

 Tegmina small, pale brownish-yellow, with dark- 

 brown nervures ; exterior edge of the wings light- 



