Superfamily Argiopoidea 



The four genera of the Pisauridae that are represented in our 

 fauna can be separated by the following table: 



TABLE OF GENERA OF" THE PISAURID/E 



A. With only two eyes in the anterior row, the anterior median 



eyes being situated a considerable distance behind the 



anterior lateral eyes. 



B. The area outlined by the four anterior eyes as long as 



wide. P. 605. Maypacius 



BB. The area outlined by the four anterior eyes much wider 



than long. P. 605. Thanatidius 



AA. With four eyes in the anterior row. 



B. Median ocular area longer than wide; lower margin 



of the furrow of the chelicerae armed with three teeth. 



P. 607. Pisaurina 



BB. Median ocular area as wide as or wider than long; lower 



margin of the furrow of the cheliceras armed with 



four teeth. P. 607. Dolomedes 



Genus MAYPACIUS (May-pa'ci-us) 



The body is very long. The eyes are in four rows; the area 

 outlined by the four anterior eyes is as long as wide. The genus 

 is represented in our fauna by a single known species. 



Maypacius floridanus (M. flor-i-da'nus).— - The abdomen 

 is narrow and long; yellow above, and ornamented with a median 

 fuscous stripe and a single series of black dots on each side. As 

 yet the species is known only from Florida. 



Genus THANATIDIUS (Than-a-tid'i-us) 



These spiders, like Maypacius, are long and slender, but 

 differ from that genus in the arrangement of the eyes, the area 

 outlined by the four anterior eyes being much wider than long. 

 A single species occurs in the Southern States. 



Thanatidius dubius (T. du'bi-us). — -This is a pale spider 

 (Fig. 690). The cephalothorax is marked with 'two slender 

 longitudinal, blackish lines, edged with greenish. The abdomen 

 bears a similar green-edged line, which bifurcates toward the 

 base, and has one small black dot on each bifurcation. 



This is a common species in the South. 



605 



