360 Wisconsin Academy of Sciences, Arts and Letters. 
find it easy, since the third legs, only the tips of which must 
touch the ground, were continually slipping down and being 
jerked back into position. 
One might think that the exacting taste of the female spider 
had now reached the limit of its power. So we believed, and it 
was in the hope of accumulating instances of the same kind, 
P. viridipes displaying fringe on first leg and enlargement on patella of third. 
not of discovering anything new, that, with Mr. Emerton for a 
companion, we went some years ago, to the Pacific Coast. At 
Sisson we found some males of Euophrys monadnock and were 
at once struck by the fact that the sexual color appeared not 
only on the femur of the third leg hut on that of the fourth as 
well, both being orange-colored. Could it he that the spider 
was able to take a position which would display the ornaments 
of three pairs of legs at the same time? 
Before the day was over several females had been taken and 
the test was made. On being introduced into the box the little 
male took in the situation in the Hash of an eye and fell instantly 
into position. The palpi, jet black with yellow ends, hung down 
in front; the first legs, black with pale tips, and fringed with 
long, thick, purplish scales, were thrown diagonally upward; 
the body was raised high on the tarsi of the second and third 
pairs, the third being lifted so that the colored femora would be 
seen over the second, while the legs of the fourth pair were 
dropped and held at just the angle that brought the femora into 
view between those of the second and those of the third pair. In 
