Superfamily Argiopoidea 



size, and spacing in the different species and are fairly constant, 

 slight variations from the formulae given in the specific descrip- 

 tions occur. 



Seven species have been described from the United States; 

 one of these, T. banksi, is found in Florida; this species I have 

 not seen. The others are widely distributed; they can be sep- 

 arated by the following table. 



TABLE OF THE MORE COMMON SPECIES OF TETRAGNATHA 



A. Lateral eyes of each side not so widely separated as the 

 anterior median and posterior median eyes. 

 B. Chelicerae of the male longer than the cephalothorax; 

 those of the female about one tenth shorter than the 

 cephalothorax. P. 411. T. elongata 



BB. Chelicerae of the male shorter than the cephalothorax; 

 those of the female only a little more than half as long 

 as the cephalothorax. P. 411. T. extensa 



AA. Lateral eyes of each side as far apart as are the anterior 

 median and posterior median eyes. 

 B. Lateral eyes of each side about the same distance apart 

 as are the anterior median and posterior median eyes. 

 P. 412. T. labor iosa 



BB. Lateral eyes of each side farther apart than are the 

 anterior median and posterior median eyes. (The genus 

 Eugnatba of some writers.) 

 C. Males 



D. Tibia of the palpus not longer than the patella; 

 chelicerae shorter than the cephalothorax. P. 414. 



T. vermiformi s 



DD. Tibia of the palpus twice as long as the patella. 



E. Chelicerae shorter than the cephalothorax, with a 



large tooth on the inner margin, and with the 



outer tooth bifid at the tip. (Fig. 423, a). 



P. 414. 



T. straminea 



EE. Chelicerae as long as the cephalothorax, all of 



the teeth on the inner margin small, outer tooth 



not bifid (Fig. 423, b). P. 415. T. pallidula 



CC. Females. 



410 



