XI 



PHASMIDAE 



273 



conspicuous fringed plates of the nature of tracheal gills ; these 

 coexist with open stigmata for aerial respiration, as in the imago 

 of Pteronarcys. The writer has examined this curious Insect, 

 and thinks it very doubtful whether the plates are branchiae at 

 all. The locality for this Insect is the island of Taviuni, not 

 Borneo, as stated by Wood-Mason. These and one or two Acri- 



FiG. 159. Calvisia atrosignaia, female. Tenasserim. (After Brunner.) 



diidae are the only Insects of the Order Qrthoptera at present 

 believed to possess aquatic habits. 



Although the number of species of Phasmidae is small in 

 comparison with what we find in many of the large families of 

 Insecta, yet there is probably no other family that equals it in 

 multiplicity of form and diversity of external appearance. 

 VOL. V T 



