GENERAL COCOONING HABITS OP SPIDERS. 



147 



Among the Citigrades, Pucetia aurora has a special interest, both from its 



appearance and structure and from the pecuHarity of its cocooning habit. 



_ . This si)ider was received in coUections sent me by Mr. W. G. 



Puc6'tia 



aurora Wright, of San Bernardino, CaUfornia. Numerous specimens of 



young and old were subsequently sent by Mrs. Eigenmann and 

 others from the same locality. The genus Pucetia belongs to the family 

 Oxyopoid£e of the Citigrade spiders, to which it is doubtless relegated in 

 spite of certain analogies with the Satigrades on the one hand and the 

 Laterigrades (Philodrominaj) on the other.^ Mr. Wright describes the 

 specimens sent me as jumping spiders; and Hentz, who describes several 

 species under the generic name of Oxyojies, says that Oxyopes salticus leaps 

 with more force tlian Attus. This family is arboreal in habit; the spiders 

 are found on plants, with their legs extended, thus practicing Tetragnatha's 

 form of mimicry, and thence spring- 

 ing upon their prey. The female's 

 cocoon is usually conical, surrounded 

 with points, placed in a tent made 

 between leaves drawn together and 

 lashed, and is sometimes of a pale 

 greenish color. Oxyopes viridens 

 will make a cocoon suspended mid- 

 way by threads attached to these ex- 

 ternal prominences, and this she will 

 watcli constantly from a neighboring- 

 site. Hentz also thought that the 

 mother of* this species carries its 

 young like a Lycosa.^ 



Piicetia aurora appears to be a new species.^ The body length is four- 

 teen millimetres ; the legs are long and tapering, except among the young. 

 The body is yellow and pale yellow ; the cephalothorax striped longitudi- 

 nally with bright red streaks; the abdomen marked above with red streaks; 

 the sternum is red; the legs ai-e yellow, with red rings at .the joints. 

 These red streaks upon the yellow background suggested the specific name 

 of "aurora." 



The cocoon nosts, according to Mr. Wright, are uniformly placed upon 

 bushes of Erigonum corymbosum. They are hung from three to four 

 feet above the ground, and, being upon the topmost twigs of tlie plant, 

 are easily seen from a distance. The cocoons, received by me in consider- 

 able number, are straw colored spheres fivc-eigliths of an incli in diameter. 

 They are covered externally with various pointed rugosities, from which 

 numerous lines extend to the adjoining corymb of the plant upon which 



Fig. 179. English Dolomedes mirabilis carrying 

 her cocoon. (After Blackwall.) 



' Thorell, On European Spiders, page 19fi. * Spiders of the United States, page 48. 



' Proceed. Aciid. Nat. Sci., 1883, page 27(), " Notes on two new California Spidere." 



