No. 2303. 



RED SPIDERS OF AMERICA— McGREGOR. 



677 



rudimentary papilla; guy fibrils are occasionally seen connecting the 

 egg with the leaf; the color is smoky-amber. 



Type.—Csit. No. 19088, U.S.N.M. 



The type material is from Orlando, Florida, August 28, 1914, from 

 the uppper surface of camphor leaves, collected by W. W. Yothers. 



An extensive series of measurements of material on Eucalyptus and 

 camphor from Florida, and on oak, elm, and pecan from South Caro- 

 lina have yielded the following averages: 



Adults. 



NOTES. 



It is of interest to record that, whereas the common red spiders 

 have long been known to feed almost exclusively on the under surface 

 of the leaf, this species confines its activities entirely to the top of the 

 leaves. 



To date the species has been recorded upon camphor (Camphora 

 officinale) and Eucalyptus, species at Orlando, Florida, avocado at 

 Miami Beach, Florida, and upon two varieties of elm, the willow 

 oak {Quercus pJiellos) , the white oak (Quercus alba) , and the pecan at 

 Batesburg, South Carolina. Mr. Yothers says that at certain times 

 it is everywhere present on the camphor tree, causing a reddening of 

 the leaves and reduced vitality of the tree. 



The species is exceedingly abundant certain seasons in North and 

 South Carolina on the foliage of the small-leaved elm ( JJlmus arneri- 

 cana), to which it imparts a rusty appearance. In spite of the 

 exposure of this species on the top of the foliage very little control 

 seems to be exerted through rains. This may be accountable through 

 the possession by the species of the strongly hooked tarsal claws 

 which character also holds in the case of P. ilicis, another species that 

 frequents the top side of leaves. 



