Pomona College, Claremont, California 141 
large Hat ccphaiothorax of the adult. The cej)halothorax was 
yellow brown with a line of green on the sides of the thoracic por- 
tion of the cephalothorax. The pattern along the median line of 
the cephalothorax is the same as that found in the young of the 
same age in the other specimen of Pcucet'ui v'tridans described. The 
cephalic portion of the cephalothorax is yellow brown, the eye space 
is brown. The abdomen is brownish green with a slight beginning 
of a folium in red. The legs were yellow green with darker green 
spots at the upper margin of each joint. The trochanter, femur, 
tibia and tarsus have a varying number of black spots. After one 
week there was another moult. The legs and palpi had not 
changed except in size. The cephalothorax had a little more green, 
the upper part very bright red at the center and shading down to 
the gray green of the abdomen. The folium was outlined in red, 
the upper part \ery bright red at the center ami shading down to 
a very light red and green in the lower part of the abdomen. The 
spinnerets were dark, co\-ered with black hairs. In a week an- 
other moult took place. The cephalothorax was light green with 
a band of dark on either side. The eye space was dark brown. 
The pattern along the median line was in dark green. The abdomen 
was dark green, the irregular pattern along the median part 
of the abdomen was in light green brown. The legs were light 
green, the femur light yellow, the spots being at the base of 
the spines on all the joints except the trochanter. After the next 
moult which took place in two weeks, the young were like the 
adult in everything but size and sex differentiation. Whether this 
form could be called a \arietv or not could not be said, but cer- 
tainly in development of the young and in the adult itself there is 
a great difference between it and the desscribed Pencetia viridans. 
The time when each was collected, and the difference in location 
may have influenced the color and color de\'clopment, but it esems 
highly improbable that it could have affected the young as w-ell. 
Arauea gemma McCook. Plate TV 
The next group studied was the .-iraiica tfcmma. The color pat- 
tern of the adult was: The cephalothorax was dark brown, almost 
black and covered with light yellow hairs. The abdomen was a 
