1908] At ane ae The r a pho sac of California 231 



late and often when the msect was considerably out of their 

 reach. A hasty retreat into the tube always followed these 

 efforts to secure a meal. 



Alia ty pus gen. no v. 



As already stated, the finding of the male of Atypoides cali- 

 fornica Banks has shown that the species can no longer be referred 

 to that genus; nor can it, in truth, be placed in any other genus 

 now described. Tho the female is quite similar to that of 

 Atypoides riversi, the males of the two species are so different 

 in notable structures that generic separation of the two is quite 

 necessary. The new genus may be known by the following 

 characters : 



Cephalothorax rather flat caudad, broader than in Atypoides; 

 thoracic pit short, round; caput lower and more rounded at the 

 summit ; eyes about the same, situated on the nearly perpendicular 

 slope of the anterior edge, eye-tuber nearly obsolete except por- 

 tion bearing anterior median eyes, which is more pronounced in 

 the male; chelicerae in female gibbous at the base above (Plate 

 XV, fig. 6), lower and more rounded than in Atypoides (fig. 7), 

 in male not gibbous basally (fig. 2), and without curved projecting 

 apophysis of Atypoides (fig. 8) ; abdomen shorter, more rounded, 

 with a sub-triangular glossy spot on the anterior slope above, 

 this spot somewhat fine-setose and with a transverse row of much 

 larger setae, normally four in number, on its posterior edge (gla- 

 brous in Atypoides) , post-abdomen well above spinnerets, which 

 are much stouter, with shorter thicker joints, the outer inferiors 

 nearly as large as the inner; sternum much larger, with six 

 impressions, the anterior pair often so close to the margin as to be 

 hidden by coxae I ; labium much wider than long (figs, i and 5) ; 

 coxae of pedipalps, in male, with a short lobe at the cephalo-distal 

 corner (fig. i), almost as in Hexura (Simon: Hist. Nat. des Ar., 

 II, p. 971, fig. nil), coxae P in female hardly different from same 

 sex of Atypoides, pedipalps of male (fig. 3) as long as legs I, rela- 

 tively twice as long as in Atypoides (fig. 9) , bulb with long slender 

 conductor; legs robust, many spined. 



The generic name is derived from ahus and Atypus, signifying 

 "a different Atypus." 



It is interesting to note that the pronounced gibbosity at the 

 base of the chelicerae above in the female of Atypoides (fig. 7), 

 is in the male exaggerated into a long, cur\-ed projection (fig. 

 8) ; while the homologous, but less pronounced, gibbosity of the 

 female of Aliatypus (fig. 6) is almost obsolete in the male of that 



