230 IOWA ACADEMY OF SCIENCE Vol. XXV, 1918 



SaJticus scenicus Clerck 1757. 



Tliis spider has at least twenty-nine sj'nonyms. It is a very 

 beautiful little fellow about six millimetres long, and is found 

 on the sides of houses and fences. The writer has observed it 

 in the greenhouse throughout the entire winter. The front of 

 tlie head above the anterior row of eyes is white. Just behind 

 the postei'ior i"ow of eyes is a pair of white spots. The rest of 

 the cephalothorax is brown. The abdomen is dark bro\^Ti with a 

 white basal band and two paii*s of oblique white spots at the 

 sides. The legs are banded alternately white and brown. 



This spider is very widely distributed throughout the United 

 States. 



ZYGOBALLUS Peckham 1885. 



The cephalothorax is very high and slopes abruptly just be- 

 hind the posterior row of eyes. The anterior median eyes are 

 more than twice as large as the anterior lateral eyes. The mid- 

 dle row of eyes is nearer to the anterior later-il eyes than to the 

 posterior eyes. The ocular quadrangle occupies more than one- 

 half the length of the cephalothora,x. 



Zijgohallus nervosos Peckham 1888. 



The collection contains only a single female of this species. 

 The following is Peckham 's description of both sexes: "In 

 both sexes the cephalothorax is brown thinly covered with 

 whitish sicales. The narrow cl^^peus is white. In the male the 

 abdomen is brown, slightly metallic, with a ven^ bright white 

 basal band extending two-thirds of the way along the sides, a 

 nearly longitudinal white bar edged with black, on each side 

 at the posterior end, and a white spot at the spinnerets. The 



female abdomen, of a lighter brown, is marked 



with two short curved bands just back of the basal band, fol- 

 lowed by two short white spots with black spots behind them, 

 and farther baek a series of indistinct whitisli chevrons, with a 

 second pair of black spots a little in front of the spinnerets." 



This species has previously been taken from INIaine to Illinois 

 and south to Virginia. 



Zijgohallus sexpunctatus Hentz 1845. 

 The cephalothorax is black and bears a small tuft of white 

 hairs in front of each posterior eye. The clypeus is covered with 

 white hairs. The abdomen is dark with a dorsal whitish basal 

 band and three pairs of white spots. The legs are reddish brown 

 with the femora of the first two darkest. A single female about 



