382 Wisconsin Academy of Sciences, Arts and Letters. 
usually take the form of bars which are often joined at their 
outer ends, low down on the sides. Sometimes the side hands 
become continuous with the basal hand, thus encircling the dor¬ 
sum; and another variation is formed by the coalescing of the 
two dark stripes on the back. The patterns of the cephalo- 
thorax, while showing much similarity, do not conform to any 
type. In species where the adult is uniform in color the earlier 
moults often show the normal pattern, and we sometimes find 
in young spiders patterns that belong to the adults of other spe¬ 
cies, hut not to those of their own. 
In the matter of coloration we have three groups, red spiders 
marked with black or black and white (in this group the males 
often have the abdomen uniform red), black spiders with tri- 
punctate white marking, and brown or gray spiders marked 
with white, the pattern lines in the last group being much more 
varied than in the others. 
The red spiders are difficult to identify and it is worth while 
to remember that if a Phidippus of this color comes from the 
north, especially from Hew England, it will almost certainly 
prove to be one of five species, clarus (very common), McCookii, 
brunneus, insignarius or Whitmanii. From the far west we 
have clarus, cardinalis, coccineus, californicus, Johnsonii, ar- 
dens, femoratus and formosus, and from the middle and south¬ 
ern states, clarus, insolens, cardinalis, coloradensis, Johnsonii, 
ardens, formosus, insignarius, femoratus and Tyrellii. 
When a leg has been lost and replaced by another the substi¬ 
tute does not have the characteristics of the original form. 
Species of Phidippus. 
Ardens $ 2 
Arizonensis $ 2 
Audax $ $. 
Basalis $ 
Brunneus $ $ 
Californicus $ and 
Cardinalis $ 2 
Carolinensis $ 2 
McCookii S 2 
Miniatus 2 
Mvstaceus 2 
Obscurus 2 
Octopunctatus $ 
2 Opifex $ 2 
Otiosus $ 2 
Pius S 2 
