Affinities of Pteronarcys regalis. * S 
In some manuscript notes, which he has favoured me with, he has designated 
the perfect insect the Drummer (Perla sonans, Barnston's MSS.). He says 
that, * when confined upon a table it sometimes makes a drumming noise, 
by beating on the wood with the end of its abdomen, whence I have given 
it its specific name, as I have not observed this done by any other species. It 
appears after the Pteronarcys regalis, and is more numerous. The perfect 
insect prefers the shade in the heat of the day. The sexes pair like the Grass- 
hopper, and their union lasts for some time. Its habits separate it much 
from Pteronarcys and Phryganea. The larva and nymph are aquatic and 
carnivorous. The cast-off spoil of the nymph is generally found under 
stones on the banks of rivers. The larva is very active in the water, and 
frequents the clefts and cracks in decayed stumps of trees, into which its ` 
flattened shape permits it to enter with facility. It is a favourite food of the 
trout.” 
The Pteronarcys, according to Mr. Barnston’s observations, is as inferior 
to this Perla in its habits of life, as I have shown it to be in its organization. 
In its pupa state it resides constantly at the bottoms of streams, and the per- 
fect insect comes forth at an earlier period, and at a lower temperature of the 
. Season than Perla. Some other Canadian Perlide, which are more nearly 
allied to it in structure than Perla abnormis, come forth at about the same 
time, and as it is doubtful whether these species have yet been described, I 
shall characterize them from specimens given by Mr. Barnston to the British 
Museum, and add some observations on the habits of each from notes made 
by that gentleman. - 
The generic characters of Pteronarcys I propose to correct as follows, in 
accordance with its structure. 
Genus Preronarcys, Newm. 
Cuar. Gen. Segmenta thoracica etiam in Imagine branchiis externis. preedita. Ale 
magne, reticulate. Palpi mavillares labialibus multo longiores, 5-articulati ; articulis 
2 basalibus brevibus, reliquis elongatis, externé dilatatis. Meidiisio petes; n 
Segmentum abdominale octavum in mari processu longo ventrali munitum, in fæminå 
paulo evolutum vel bifidum. : 
The following new species has recently been brought by Mr. Hartweg from 
California. : 
9N 
