TIIOMISIDJi] OF AMES REGIOM 155 



Philodromus minutis Banks. Several females measuring about 

 lwo and one-half millimetres are in the collection. The cephalo- 

 thorax is a light brownish yellow with the sides darkest. On the 

 basal half of the abdomen there is a median brown stripe, while 

 on the caudal half there is a pair of white stripes on either side. 



Philodromus minutis is always found on low-lying bushes. Emer- 

 ton previously reported this spider from the New England states 

 but probably it is distributed throughout the eastern half of the 

 country. 



PhitodroiiiKS oniafits Banks. A number ranging in length from 

 two to three millimetres are in the collection. The general color is 

 brown with a ground color of white. The cephalothorax is brown 

 with a white central stripe. The abdomen is white with a pair of 

 longitudinal brown stripes extending about half its length on the 

 dorsal side. On the caudal half of immature individuals there are 

 several dark chevrons, which may be faintly indicated in adults, 

 although they are usually absent. 



This spider is distributed throughout the eastern half of the 

 country. 



Pliilodromus pcrnix Blackwall. This is a very common spider 

 in the vicinity of Ames. Mature individuals measure from six to 

 eight millimetres in length. Both males and females are repre- 

 sented in the collection. The general color is gray and greatly re- 

 sembles old unpainted wood. The under side of the abdomen is a 

 dirty white. This same color can be seen dorsally at the caudal 

 extremity of the abdomen. There is a long oval spot on the 

 anterior half of the abdomen and a few dark chevrons appear on the 

 posterior half. The legs are very finely mottled with dark brown 

 spots which become larger near the joints. 



This species is most commonly found around houses and fences 

 and occasionally on plants. It is very widely distributed throughout 

 the United States. 



Zoology Department, 

 Iowa State College. 



BIBLIOGRAPHY 



1842-45 — Hentz, H. M., Occasional Papers, Journal of the Boston Society 



of Natural History. 

 1846 — Koch, C, Die Arachniden. 

 1880 — Keyserling, E., Neue Spinnen aus Amerika, Vol. 1. 



