340 POMONA COLLEGE JOURNAL OF ENTOMOLOGY 



which is described by the writer in the Pomona Journal of Entomology, Vol. 

 I, No. 2, Page 43, 1909. Microscopical comparisons prove them to be identical, 

 but distinct from Pseudococcns obscunis Essig, which was described from 

 Opuntia. At the time of the original description, the limited supply of both 

 forms made it impossible to separate them as I have now done. At that time, 

 however, it did seem very improbable that the same species lound on the 

 roots of Opuntia, at Los Angeles, could be synonymous with a species found 

 working on the new bark of Sambucus glauca (Elder) at Santa Paula, 60 

 miles away. Even yet the supply of the Opuntia form is so limited as to make 

 good comparisons impossible, but the accompanying drawings of the legs and 

 antennae bring out the main characteristics of the two forms. It might be 

 said here that the new species from Elder, Walnut, Apple, and Pear, is much 

 broader and covered with a greater amount of white, powdery wax than is the 

 original P. obscurus. 



At the same time that this insect was found were found many individuals 

 working similarly upon the oak trees. This mealy bug was described as 

 Pseudococcns agrifoliae Essig and is evidently distinct from Pseudococcns 

 quercns Ehr. Thinking that perhaps the new mealy bug found upon the 

 elder might be synonymous with the species described by Ehrhorn, and not 

 having a mounted specimen of P. quercns, I sent several slides to Mr. Ehrhorn 

 asking him if it was the one which he described from the oak. This is a 

 copy of his letter : 



Honolulu, Hawaii, July 22, 1910. 

 Mr. E. O. Essig, 



County Horticultural Commissioner, 



Santa Paula, Cal. 

 Dear Sir : Your letter of July 2nd, and specimens of Pseudococcns species 

 on microscope slides came to hand. 



I have examined your specimens with the type of P. quercns and I find 

 that the antennae are quite different, the joints being of a different shape. The 

 derm around the anal ring contains many more glands in qnercus and the 

 marginal spines are stouter. In your species the antennae are more hairy, 

 so are the legs and the trochanter has a much stouter bristle. Your species 

 is surely not P. qnercus. I have no idea what it is and am sorry that I 

 cannot help you in the matter. It will probably prove a new species. 



Very truly yours, 



EDW. M. EHRHORN, 

 Superintendent of Entomology. 



The species is, therefore, named bakeri in honor of Prof. C. F. Baker, 

 of Pomona College, who has aided me more in my entomological work than 

 has any one else. It was he who first gave me a start on the genus Pseudococcns 

 and I take great pleasure in dedicating this well defined and distinct species 

 to him. 



