130 Journal New York Entomological Society. [Vol. xx. 



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NOTES ON A MISTLETOE ANT. 



By William Morton Wheeler, 

 Boston, Mass. 



While collecting in Miller Canyon, in the Huachuca Mts., Arizona, 

 during November, 19 10, my attention was attracted l)y the very large 

 and beautiful masses of mistletoe {Phoradcndron flavescens var. 

 villosiim) growing on the live oaks (Oiicrciis ciiioryi) which in that 

 locality abound at altitudes of 5,000-6,000 feet. I noticed that many 

 of the masses of mistletoe had wilted more or less and had turned 

 yellow. On closer examination I found that their stems at the base, 

 and in many cases for several inches from their point of attachment 

 to the oak branches, had been hollowed out by a beetle larva and that 

 the cavities thus formed were regularly tenanted by colonies of a 

 small black ant (Crciiiasfogasfcr ari:;niicnsis Wheeler). The worker 

 of this ant was first described from Tucson, Arizona/ where I found 

 it to be not uncommon on the trunks of cotton-woods and mesquites 

 in the valley of the Santa Cruz River. In the Huachucas it was not 

 only living in the hollow stems of every yellow mistletoe which T 

 examined — and I broke open dozens of them from many different 

 oaks — but the walls of the cavity were invariably covered with red- 

 dish Coccids, which the ants were busily attending. These Coccids, 

 which Prof. T. D. A. Cockerell has kindly identified for me as 



' " The Ants of Texas, New Mexico and Arizona," Part I, Bull. Amer. 

 Mus. Nat. Hist., XXIV, 1908, p. 482. 



