Superfamily Argiopoidea 



is a median, longitudinal stripe, which sometimes is only faintly 

 indicated. The females of this and the following species resemble 

 each other closely. The males can be distinguished by the form 

 of the apophysis borne by the tibia of the palpus. In this species 

 this apophysis is of the form shown in Fig. 646. 



Fig. 646. 

 OUTER FACE OF PALPUS 

 OF CLUBIOXA OBESA 





I 







i 



Fig. 647. 

 OUTER FACE OF PALPUS 

 OF CLUBIOXA TIBIALIS 



Chibiona tibialis (C. tib-i-a'lis). — This species is of the same 

 size and colour as the preceding. In the case of the females, the 

 differences between the two species have not been determined. 

 The male of this species can be distinguished by the form of the 

 apophysis of the tibia of the palpus (Fig. 647). 



Genus CHIRACANTH1UM (Chir-a-can'thi-um) 



The cephalothorax is somewhat convex and lacks the median 

 furrow of the thorax. The posterior median eyes are farther 

 from the lateral eyes than from each other. The lower margin 

 of the furrow of the chelicerae is armed with two or three teeth, 

 which are situated some distance from the base of the claw. 

 The anterior legs are longer than the posterior; and the first two 

 pairs of legs are armed with but few and not paired spines. 



In colouration these spiders resemble Chibiona, and have 

 similar habits, living in silken tubes. Although this is a large 

 genus, only two species have been found in the United States. 



Chiracantbium inclusion (C. in-clu'sum). — This species 

 measures about one third inch in length. The colour in life is 

 greenish white, with the chelicerze brown. The cephalothorax 



569 



