On North American Spiders. 107 
or perhaps seven new species from New England, but which are too 
much dried up to be well delineated or described. That single fact 
shows how far this is from being a complete list of North American 
Spiders. The famous ‘T'aranroxa of the South of Europe, the 
bite of which, for many years, was supposed to produce a disease that 
music alone could cure, belongs to this genus; and I found on Round 
Hill, Mass. a species (Livcosa fatifera, my catalogue) which is prob- 
ably very closely related to the European species, and which dwells 
in holes, nearly a foot deep. ‘These holes seem to be dug by the 
spider, and to be increased gradually, as its size may require; the 
opening has a ring of filaments woven by the spider to prevent the 
filling up of the cavity by rain. It is in this genus also that we may 
witness astonishing instances of maternal tenderness and courage ; 
and that too in the most cruel race of animals, a race in which fero- 
city renders even the approach of the sexes a perilous act, and con- 
demns every individual to perpetual solitude, and apprehensions of 
its own kind. When a mother is found with the cocoon containing 
its progeny, if this be forcibly torn from her, she turns round and 
grasps it with her mandibule. All her limbs, one by one, may then 
be torn from her body without forcing her to abandon her hold. But 
if, without mangling the mother, the cocoon be skillfully removed 
from her, and suddenly thrown out of sight, she instantaneously loses 
all her activity, seems paralysed, and coils her tremulous limbs as if 
mortally wounded ; if the bag be returned, her ferocity and strength 
“te restored the moment she has any perception of its presence, and 
© rushes to her treasure, to defend it to the last. 
Arrus, (Walck.) Salticus, (Latr-) 
Eyes 8, unequal in size, < ; legs usually short and proper 
re leaping, of different sizes; maxille erect, rounded. Wandering 
quest of prey, and leaping. Making no web, but tubes of silk for 
shelter, in crevices, under bark, &c. ‘Twenty nine species. The 
"umerous species of this genus display skill and varied stratagems to 
~ Ze their prey, which must be interesting to an observer of nature. 
Uhave Preserved the name of Arrus because the name ATTA previ- 
ous'y given by Fabricius to a subdivision of Formica could not be 
Mistaken for this, any more than the Romans would casus for casa, 
and a thousand such words. 
