MIMICIIY IN Sl'IDEKS. 377 



building in dead branches, where its wood Ijrown or grayish color resem- 

 bles small pieces of bark or bits of rubljish entan<rlcd in deserted webs. 

 They also perceive a case of cocoon mimicry in her habit of so disposing 

 her grayish cocoons along the wel) as to look like a mass of nilihisli. Tlie 

 j)rotective resemblance in this species, therefore, is twofold : that of the 

 spider to particles of dead wood entangled in its snare, and to the dry 

 branches among which the snare is spun ; and again, that of the si)ider 

 to her cocoon. When Uloborus is found, however, as I often have found 

 it, in the midst of green laurel bushes or other verdant environment, the 

 fact of a protective resemblance disapjaears. If we concede the cause of 

 mimicry as urged by the Peckliams, we must go still further, it seems to 

 me, and suppose that the spider is endowed with a power, in one locality, 

 which forsakes her in another, and it may be a nearby one. 



Theridium serpentinum ' (Fig. 108, page 112), with her glossy brown 

 colors, can scarcely be considered as bearing a striking resemblance to the 

 snow white cocoons which she hangs within her snare ; and Epeira laby- 

 rinthea (Fig. 85, page 100) can by no stress of imagination be reckoned 

 as bearing a resemblance to her cocoons. 



' This specie.s Dr. !\Iarx catalogues as a synonym of Teutana triangulosa AValck. "Cata- 

 logue of the Described Araneaj of Temperate North Amei-ica," Proceed. U. S. Nat. Mus., 1890, 

 No. 782, page 521. 



