748 MR. F. 0, PICKARD CAMBRIDGE ON [June 16, - 
hung by a tuft or two of hairy campos-grass or arched over 
behind with a few dry leaves, the first two pairs of legs, pedipalps, 
and mandibles alone visible; in colour closely similar to the sur- 
rounding sand. A footfall, or a shadow, and they would vanish. 
What their food may be I cannot say, for no débris was ever to be 
found in the burrow. Do they wait for it to come within reach, or 
do they go and seek it? I thinktheformer. On several occasions, 
having sat up all night and now and again, at intervals of an hour, 
been the round of the burrows, each tenant was always found in 
exactly the same position; nor did I ever find one running about 
at night over the campos or in the forest. They may possibly, 
however, dash out a few feet and seize their prey when it passes, 
but I do not think they actually go in search of it. 
What the males do with themselves I am utterly unable to say, 
for though I watched and searched and waited many times at night 
and dug out numerous burrows, yet on no occasion did I find a 
male within, nor find one, as I fully expected to do, running over 
the sand outside. 
Females were taken in all stages of development, though it is 
quite possible I was too late for the male sex. 
In spinning the trumpet-shaped mouth to the burrow, the Spider 
takes up a position with the abdomen and hind legs only appearing 
from the burrows, and then by rubbing the spinners backwards and 
forwards covers the ground round the entrance with fine white silk. 
The large white cocoon, formed of a loose bag of silk, containing 
from 80-100 eggs, lies loose in the slightly enlarged end of the 
burrow. When the young are first hatched, they nourish them- 
selves on the moist envelopes of the eggs, whence they have just 
emerged. Later they may be found crowding the entrance of the 
den or below with their mother. 
Contrary to one’s expectation, the temperament of these spiders 
appears to be gentle; though raising themselves on the hind legs 
and striking with the mandibles when irritated, yet there is no 
inclination to initiate an attack.- Neither in confinement, 
though starving for want of food, since they would eat neither 
worms, caterpillars, crickets, cockroaches, moths, nor millipedes, 
did they show any inclination to attack each other nor the 
young spiders which were with them. Water they drank eagerly 
enough. 
Nothing could be externally more unlike than the Spiders I have 
included in this genus aid those usually included in the genera 
Avicularia and Tapinauchenius. The latter are much more hairy 
and the first pair of legs are equal to or less than the fourth pair. 
In the former the legs are not clothed with long hairs, and the 
first pair are longer than the fourth. The coxe, femora, and 
patella, too, of the first two pairs of legs are very stout, while 
those of the third and fourth pairs are more slender, especially 
the fourth. In Avicularia and Tapinauchenius the tarsi and pro- 
tarsi of all four pairs are broad and spatuliform ; in Santaremia 
those of the third pair are much less so than those of the first 
