GKNUS HERMANNIA. 44"J 



abdominal, which are usually the great tracheso. I 

 did not succeed in finding any tracheee at all in H. 

 picea. 



The Caeca of the ventriculus seem to vary a good 

 deal in different species; in H. arrecta (PL E, fig. 1) 

 they are almost globular; in H. picea they are much 

 more elongated and sausage- hke. 



The Ovipositor is short and thick, but neither so 

 short nor so thick as in DamcBus. 



The expulsory vesicles attain a great development 

 in this genus ; in H. arrecta and II . granulata they 

 discharge through chitinous tubular projections from 

 the sides of the abdomen ; in H. picea and H. histriata 

 through pores placed rather more dorsally. 



The Hairs, both those on the abdomen and on the 

 legs, and also the lamellar and interlamellar, have a 

 tendency to become thick and rod-like in this genus, or 

 spatulate, sometimes broadly so (PL XLI, fig. 9). 



The creatures of this genus are widely distributed, 

 but not specially abundant. They are found chiefly 

 in dead wood, moss, &c. ; and the adult of H. nodosa 

 and the nymph of H. histriata appear to be amphibious 

 and to thrive equally well on land or on Sphagnum or 

 Algse under fresh water. 



The Nymphs generally have the cephalothoraces 

 and legs fairly resembling those of the adult, but the 

 abdomines very different, except in H. 7ianus, where it 

 is more similar. 



