Superfamily Avicularioidea 



ordinary appearance due to the presence of a long, projecting 

 curved apophysis at the base. This is cylindrical, obtusely pointed, 

 and densely clothed at and near its extremity, above and on the 

 sides, with long coarse bristly black hairs. 



The female resembles the male in colour. But instead of the 

 long projection on the cheliceras, there is on each a simple, strong, 

 subconical prominence directed a little backward. 



This species was described by Rev. O. P. Cambridge from 

 specimens collected at Berkeley, Cal. by Mr. J. J. Rivers. 

 It is stated that it tunnels in banks mostly by streams, forming 

 a tubular projection above ground of any material at hand, 

 woven up with silk, making no trap-door, but closing the aperture 

 at times. 



Genus ALIATYPUS (Al-i-at'y-pus) 



As in the preceding genus, there are three pairs of spinnerets; 

 but the median furrow of the thorax is a rounded pit; the palpus 

 of the male is furnished with a conductor of the embolus, and 

 the pedipalps of the male are as long as the first legs. 



Aliatypus calif ornicus (A. cal-i-for'ni-cus).— - The body 

 measures about one half inch in length. The cephalothorax and 

 legs are pale; the abdomen brownish or grayish with theventerlight. 



This species has been recently studied by Mr. C. P. Smith, 

 at Stanford University. In his account (Smith, '08), he states 

 that the spider is found in the foothills and mountains on each 

 side of the Santa Clara Valley. The burrow is comparatively 

 long, simple, with a simple trap-door. 



Subfamily HEXURIN^E (Hex-u-ri'nae) 



The characteristics of this subfamily have been given in the 

 discussion of the preceding subfamily. Nothing is known of the 

 habits of these spiders; but the absence of the rake of the chelic- 

 erae indicates that they do not tunnel in the ground. 



Only two genera are known, each represented by a single 

 species; one of these is from the Pacific Coast of the United States, 

 the other from Argentina. 



1 o v 



Genus HEXURA (Hex-u'ra) 



The median furrow of the cephalothorax is longitudinal 

 but broad and short. There are three pairs of spinnerets. The 



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