Superfamily Argiopoidea 



widely distributed species; it occurs throughout the eastern half 

 of the United States. 



Zygoballus nervosus (Z. ner-vo'sus). — "In both sexes the 

 cephalothorax is brown, thinly covered with whitish scales. The 

 narrow clypeus is white. In the male the abdomen is brown, 

 slightly metallic, with a very 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 much like that of Z. bettinii, with two short 



Fig. 767. EPIGYNUM OF ZYGO- 

 BALLUS BETTINII 



ti 



Fig. 769. EPIGYNUM OF ZYGO- 

 BALLUS SEXPUNCTATUS 



Fig. 768. ZYGOBALLUS SEXPUNC- 

 TATUS, MALE 



curved bands just back of basal 

 band, followed by two large white 

 spots with black spots behind 

 them, and farther back a series 

 of indistinct whitish chevrons, 

 with a second pair of black spots 

 a little in front of the spinnerets" (Peckham). This species 

 has been taken from Maine to Illinois and south to Virginia. 



Zygoballus sexpunctatus (Z. sex-punc-ta'tus). — This species 

 closely resembles Z. bettinii; but the male differs in having a large 

 white spot at the beginning of the thoracic slope, and in having 

 the bulb of the palpus with a longitudinal division. In the typical 

 form the two transverse bands of the abdomen are so broken that 

 the first consists of four spots and the second of two (Fig. 768), 

 giving the six spots which suggested the specific name, but these 

 spots may be wanting. The female can be best distinguished by 



698 



