13(3 AMICKICAX Sl'lDlCHS AND THEIR SPINNINGWORK. 



habits existing side by side in the Lineweavers and an Orbweaver which 

 affects a lineweaving sjiinningwork. 



On one leafless bush I found two individuals established whose several 

 premises had been merged into one by the blending of the two labyrinths. 



(Fig. 120.) It was quite a case of cooperative housekeei)ing ; or, 

 Cooper- ^Q make a closer analogy, it suggested the double houses one 

 ?L^^® often sees in citv arcliitecture, with united partv wall and com- 



keeping """* porch separated by a rail. The cross lines of tlie two 



mazes completely blended ; one spider was domiciled under a 

 leafy rodf, the other under a woven tent; diic (irlj faced toward the front, 

 the other toward the side of the united labyrinth. 



The Labyrinth Spider has a very wide distribution through the United 

 States, and will probably be found to inhabit our entire territory. It has 



been traced from New England south and westward to Colorado 

 ^®^' . and California, and I have specimens from several States of 

 S"-*? -^^ South America. These last, like numerous examples from South- 

 tion ''^'^ California, differ from the more northern fauna in being 



larger and somewhat more brightly marked. Their cocoons are 

 also larger, and probably their snares are more formidable ; otherwise, they 

 are substantially the same species. It, therefore, must be added to that class 

 of our aranead fauna whose physical elasticity enables them to occupy with 

 equal facility a far northern and far southern home. However, in questions 

 of geographical distribution, the factor of vertical distribution ought not to 

 be forgotten. A far southern species may have a practically boreal habitat 

 by elevation upon a mountain range. I cannot speak positively as to this 

 point concerning South American Labyrinthea.s, but the specimens from 

 Southern California were taken from the seashore and the ordinary level 

 of San Diego. 



II. 



One of the most alnnidant of the small group of spiders that weave 



sectoral orbs is Epeira triaranea, so called because of its composite snare, 



which combines with that of the Orbweaver a decided retitelarian 



peira ^,yQ\) and a quite good approximation to that of the tubeweaver.i 



I have found the orbs of this species, from June 1st throughout 



the summer, on bushes, shrubs, trees, hedges, on and between fences, and in 



' This spider was firet noticed by me under tliis name in Proceedings Ai'ademy of Nat- 

 ural Sciences, Philadelphia, 1870, page 201. Sul)sequcntly, in the .same journal, 187S, page 127, 

 I gave a full description of the animal and its sjjinningwork, with figures, under the name of 

 Epeira globosa, a spider closely resembling my species, which had been described by Key- 

 serling, Vcrhand. d. zool.-bot. Ver., XX., 1865, page 820. I had the name changed at that time 

 in the i)age i)ro(jfs of my ]iai)er, but being now less certain as to the identity of Keysorling's 

 species I follow Mr. Emerton in returning to my original name. It is not improl)al)le that 

 Keysorling's name will be finally given jiriority. 



