224 IOWA ACADEMY OF SCIENTE V.a. XXV, 191S 



lateral eyes than to the posterior. Most of the speeie« of this 

 genus can be identified by their characteristic markinirs. 



PhidipiMis audax Hentz, 1845. 



This is a large spider. The ten specimens in the collection at 

 Ames range from nine to fourteen millimetres in lengt-h. The 

 cephalotiiorax is black, covered with short black and white hairs. 

 The clypens is thickly covered with wliite hairs. The mandibles 

 are a bright irridescent green, and the daws :*re reddish broAni. 

 The abdomen is black and is covered with short black hairs and 

 longer white ones. On the dorsal side of the ^sbdomen at about 

 the middle is a large somewhat triangular white spot; a little 

 further caudad and on each side is a pair of white spots. Di- 

 rectly back of these near the apex is another very minute pair 

 of white spots. Some of the specimens have a faint white basal 

 band on the abdomen. In some immature specimens the mark- 

 ing's are a delicate orange yellow. 



P. audax is perhaps one of the most common of our Attids. 

 It ranges throughout the United States, ^hiefly from tlie Eastern 

 coast as far west as Colorado. It has l/een described itnder at 

 least a dozen names. Koch in his Die Araehniden, published in 

 1846 is responsible for nine synonyms. 



Phidipptis castrensis Koch 184G. 



This is a medium sized spider of which there is in the col- 

 lection but a single male. The colors have been very xiuch 

 dulled due to long preservation in alcohol. The cephalothorax 

 still retains some of its brilliant orange colored srales. The 

 sternum and mouth parts are black. The abdomen is orange 

 brown with a dorsal white basal band. The li gs are uniformly 

 brown with whitish bands at the joints. The coxa are all 

 darker than the rest of the legs. 



This spider has previously been rejjorted from tlic eastern 

 states by Emerton and from Pennsylvania by Peckham, 



Phidippus electus Koch 1846. 

 The cephalothorax is dark brown, covered with whit-e hairs, 

 with some longer black hairs in the eye region. The dorsal side 

 of the abdomen has a light longitudinal central stripe on which 

 is a faint white stripe and two pairs of white dots. The 

 sternum and ventral side of the abdomen arc brown and are 

 covered with short white hairs. The legs are a uniform lidit 

 brown and are eovered with lonu- white hairs. 



