20 A CONTRIBUTION TO THE KNOWLEDGE OF 



Dactylopius confusus (Ckll.). 



Material examined. From a flat Opuntia at Tucson, Ariz., and from 

 Opuntia polyacantha (?) at Helena, Mont., the latter collected by Profes- 

 sor Doane. 



Dactylopius indicus Green. 



Material examined. From Opuntia sulphurea in the greenhouse at 

 Stanford University. This plant had but recently been received from the 

 New York Botanical Garden and bore a label indicating that it had been 

 collected in Argentina about a year before. None of the other cacti 

 which accompanied it were infested and it appears probable that this is 

 its native host. This is the second record of the species. The deter- 

 mination has been confirmed by Mr. Green. 



Dactylopius tomentosus (Lam.). 



Material examined. From an undetermined, jointed, cylindrical 

 cactus at Gruendyke's Well, between Mecca and Blythe, Cal., and from 

 a cylindrical Opuntia on the butte at Tempe, Ariz. Also from Opuntia 

 sp. at San Diego, Cal. Specimens from the last named locality have been 

 recorded by Essig in his "Injurious and Beneficial Insects of California" 

 as D. confusus, but there is every probability that this record really has to 

 do with tomentosus, which appears to be abundant in that locality. 



: Genus PUTO Sign. 



Puto yuccae (Coq.). 



1918. Puto yuccae (Coq.) ; Ferris, Cal. Species Mealy Bugs, p. 64. 



What appears to be this species was taken from the crowns of Yucca 

 sp. at Magdalena, N. Mex. ; Aster spinosus at Tucson, Ariz., and evening 

 primrose a few miles north of Bishop, Cal. 



Genus PHENACOCCUS Ckll. 



Phenacoccus betheli (Ckll.). 



Fig. 6. 



Type host and locality. From Amelanchier sp., Grand Canyon, 

 Ariz. 



Specimens examined. Part of the type material. 



Habit. "Adult females solitary on the twigs; hemispherical or 

 nearly; about 4 mm. long, 2^4 mm. broad, a little over 2 mm. high; dark 

 raspberry-red, covered dorsally with white mealy secretion in small tufts, 



