152 IOWA ACADEMY OF SCIENCE Vol. XXVI, 1919 



small whitish tubercle. The area defined by the four median eyes is 

 narrower in front than behind. Two species of this genus are in the 

 Ames collection. 



Misumena vatia Clerck. This is a very beautiful spider found 

 chiefly on flowers. One of the most marked characteristics is the 

 change in color that takes place when it migrates from one flower 

 to another. The writer has collected it in the fall of the year on 

 golden rod where the color was a light yellow. On various other 

 flowers the color is white, and on brilliantly colored flowers there 

 are bright red markings on a white or yellowish background. 



Several full-grown females measuring from ten to twelve milli- 

 metres in length are in the collection. The general colors of these 

 vary from milk-white to yellow, with frequently a bright red stripe 

 on each side of the abdomen and some red in the eye region. The 

 sides of the cephalothorax are always darker than the center. The 

 legs are white with a slender light brown stripe on the upper side 

 of the first and second pairs. 



This species is very widely distributed throughout the United 

 States. 



Misumena alcatoria Hentz. This spider very closely resembles 

 Misumena vatia in color and markings, although it does not have the 

 red stripe on the sides of the abdomen. The chief characteristics of 

 this species are the white transverse stripe between the two rows of 

 eyes extending into lines over the chelicerae and around the sides 

 of the head and the double row of brown spots on the dorsal side of 

 the abdomen. Two females measuring five millimetres in length are 

 in the collection. 



Misumena aleatoria is distributed throughout the United States. 



Genus CORIACHNE 



The cephalothorax and abdomen are low and flat. The anterior 

 row of eyes is straight while the posterior row is very much re- 

 curved. The four median eyes are smaller than the lateral eyes. 

 The area defined by the median eyes is wider than long. 



Coriachne versicolor Keyserling. The single female in the col- 

 lection measures five millimetres in length. The general color is 

 black and gray on a dirty white background. The abdomen is 

 mottled irregularly with black and white spots. There is a dark 

 spot on the thorax just in front of the dorsal groove while on each 

 side there is a more or less connected row of dark spots. The legs 

 are thickly covered with black spots which are larger near the joints. 



This species is found on fences and stones, which it very closely 



