Superfamily Argiopoidea 



behind its middle there is a small ovate yellow spot with a black 

 dot at the centre, and each side of its apex a larger triangular 

 yellow spot; on the hinder part of the abdomen there are several 

 yellow chevrons. The lateral tubercles of the epigynum are 

 widely rounded behind (Fig. 724, b). The female measures one 

 sixth inch in length. 



The specimens from which this species was described were 

 taken at Washington, D. C. 



Pirata humicolus (P. hu-mic'o-lus). — The sides of the cara- 

 pace are brown to black with lighter radiating lines; there is a 

 yellow median band of the usual form, and on each side of the 

 thoracic part a yellow supramarginal stripe, which is limited below 

 by a black marginal line; in life there is a marginal line of white 

 hair. The abdomen is brown above with a greenish tinge; it is 

 marked by a basal lanceolate median stripe, and with four rows, 

 two on each side, of spots clothed with white pubescence. The 

 female is one sixth inch in length; the male, about one eighth inch. 



This species occurs in the Middle States. 



Pirata montanus (P. mon-ta'nus). — The carapace is deep 

 brown or blackish, with a forked yellow median stripe of the usual 

 form; there are no lighter lateral stripes in the integument, but in 

 life there is on each side a marginal line of white hair. The ab- 

 domen is black above, with a reddish brown median lanceolate 

 stripe at base, and on each side of the apex of this stripe a reddish 

 spot; on the hinder part of the abdomen are several chevrons; 

 all of these markings may be indistinct; in life there is on each side 

 a series of about six spots of light yellow hair. The posterior 

 margin of the epigynum is nearly straight. (Fig. 724, c.) 



This species has been found in the mountains of the Northern 

 States and in Utah. 



Pirata marxi (P. marx'i). — The sides of the carapace are 

 brown or grayish black crossed by many radiating lines of black; 

 there is a forked yellow median band of the usual form, and on 

 each side a supramarginal yellow stripe limited below by a black 

 marginal line; there is no marginal stripe of white hair. The 

 abdomen is yellow with markings in black; there is a lanceolate 

 outline at base, and along each side a wavy or zigzag stripe, each 

 united with the lanceolate outline at its base and again at its 

 middle; and on the hinder part of the abdomen there are several 

 short black marks. Figure 724, d represents the epigynum. The 



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