12 
QRCHESTIIDiE. 
animal are short and stiff. The mode of progression, 
when out of the water, is by leaps. The animals are 
generally terrestrial or subaquatic. This tribe contains 
but a single family. 
Fam.— ORCHESTIIDiE. 
The superior antennae are never longer than the inferior, 
and never furnished with a secondary appendage. The 
mandibles are without a palpiform appendage. The 
squamiform joints of the legs are largely developed. The 
caudal appendages are very short and stout, and the pos- 
terior pair only possess a single branch. 
The following vignette represents the Hoe Gate, Ply- 
mouth, the house in which Dr. Leach was born. 
