INSECTS AND THEIR NEAR RELATIVES. 
41 
spiders frequently attract especial attention by dragging 
after them a large gray ball (Fig. 47) ; this is the egg-sac, 
which the female carries about with her attached to her 
spinnerets. These spiders run swiftly; and as they depend 
Fig. 47 .—Lycosa and egg-sac. 
on the use of their legs for the capture of their prey, they are 
well termed Running Spiders. 
These spiders resemble in general appearance and in 
habits the Tarantulas of the South and the West. But none 
of our species attain the great size of some of the Tarantulas, 
and in the Running Spiders the claw of the mandibles 
moves horizontally instead of vertically. 
In this family the body is hairy and usually much longer 
than broad. The eyes differ markedly in size, and are 
arranged in three or four rows. The larger eyes are not in 
the front row. The legs are rather long and quite stout. 
Like the Tarantulas, some of the Running Spiders build 
tubular nests in the ground, 
which they line with silk. Some¬ 
times the entrance to these nests 
is concealed by small sticks and 
leaves, and sometimes the spi¬ 
der builds a regular turret over 
the entrance of its tube (Fig. 48). 
These nests are used merely as 
retreats, the spiders wandering 
forth in search of their prey. 
The larger members of our 
common species belong to the 
genus Lycosa (Ly-co'sa). These 
drag after them their egg-sacs as described above; and 
Fig. 48.— Entrance to nest of Turret 
Spider, Lycosa arenicola . (After Marx.) 
