Pomona College, Claremont, California 143 



\ great number ot juveniles oi the species Misumessus asperatus 

 were collected and onl\ the approximate ages can be stated in the 

 following discussion of them, l'hc adult female is described .is 

 "pale yellow in color with dull red markings or the ground coloi 

 nu\ he greenish. There is .i brownish stripe on each side of the 

 thorax, a median light red band on the basal halt of the abdomen. 

 two bands or rows oi spots 0:1 the hind halt and a band on each 

 side. The male resembles the female in colors and markings, bur 

 is only about one-hall as long." The newly-emerged are light yel- 

 low in color ot abdomen, eephalothorax and legs, with slight red- 

 dish markings on the sides ot the eephalothorax .\nd the dorsal 

 portion of the abdomen. At the age ot three months the males 

 could be separated from the females although the palpi showed 

 no differentiation, but the size ot the two were quite distinct. The 

 male at this age has the bright yellow eephalothorax with a brown 

 band on either side ot the median spaee. This band does not go 

 to the side ot the eephalothorax but extends around the anterior 

 and posterior lateral eyes. The abdomen is marked the same as 

 the adult, only not so distinctly. The coxa, trochanter and femur 

 ot the legs and palpi are light yellow brown with an indistinct red- 

 dish band at the upper margin ot each joint. The tibia, tarsus and 

 metatarsus are light yellow. In the adult male, the eoxa is yellow 

 brown, the trochanter and femur are the same with a small 

 band at the upper margin ot" each joint and the upper halt oi the 

 tibia, the metatarsus and tarsus are dark red. The trochanter is 

 covered with small dark red spots. The spines ot the juvenile 

 male had developed at the age of three months to the si/e oi the 

 adult spines. In the matter oi si/e, the juvenile was about three- 

 fourths the si/e ot the adult. The juvenile female oi the same 

 age was marked like the adult, only fainter, and the size was ab 

 the same proportion as in the other sex. 



In following through a lite history oi Philodromus per 



Kysticus C< rnicus and Misumen it is found that the 



color changes that take place from the newly-emerged to the adult 

 indicate the pattern ot the adult. The colors may not be as distinct 

 .-. s on the adult, yet on each succeeding moult the pattern becomes 

 plainer. Thus it can be said that the Thou 1 lange very little 



from the immature to the mature in the cas< : color and pattern. 



