442 JOURNAL OF ECONOMIC ENTOMOLOGY [A^ol. 2 



The Frosted Scale 



Lecanium pruinosum Coquillett. 



Lecanium pruinosum Coq., Ins. Life, III, p. 382 (1891). 

 Lecanium roUnioB Towns., Bull. 7, N. Mex. Exp. Sta., p. 11 (1892). 

 Lecanium robiniarum Ckll. (non Dougl.) Can. Ent., XXVII, p. 257 (1895). 

 Eulecanium rohinicB var. subsimile Ckll., The Entom., XXXV, p. 178 (1902). 



This species, which has been of some economic importance in Cal- 

 ifornia, seems to be a native of the highlands of Mexico, whence it 

 has been introduced to the fruit districts of the above State. The 

 synonymic variety subsimile, which occurs on ash or Rhus (?) in ]\Iex- 

 ico, points to this region as the probable home of L. pruinosum. The 

 specific name is descriptive of this species when it is covered with fine 

 powdery wax, but this character is not always evident in some local- 

 ities where it occurs. Its general appearance is like a very large L. 

 corni, very convex, dark reddish brown, variously pitted and grooved ; 

 the 7-jointed antennae and the legs and other characters are quite sim- 

 ilar to corni, but the derm pores furnish the most evident character for 

 the species, as will be seen by reference to the photomicrograph of the 

 derm. The pores are small, clearly defined, and regularly arranged, 

 but they do not show a tendency to arrange themselves in broken rows 

 perpendicular to the margin as in L. corni. 



This species occurs in California on the apricot, peach, plum, prune, 

 pear, apple, ash, locust, English walnut, grape, rose, etc. In New 

 Mexico, Arizona and Mexico there may be many other hosts. 



The Hickory Lecanium 



Lecanium caryce (Fitch) 



Plate 19, Fig. 5 



Lecanium caryce Fitch, 3d Rep. Ins. N. Y., p. 125 (185G). 

 Lecanium cockerelli Hunter, Kan. Univ. Quar., VIII, p. 70 (1899). 

 Eulecanium caryce King, Can. Ent., XXXIV, p. 160 (1902). 



Contrary to published reports, Fitch's types of this species are in 

 the national collection at Washington in good condition, so that we 

 know the species accurately. There is little possibility that any one 

 should confuse it with any of our other Leeaniums on account of its 

 enormous size ; length, 10-13 mm. ; breadth, 7-9 mm., and height, 

 3-5 mm. The buff or yellowish-brown color of the developing female 

 changes after oviposition to a beautiful deep reddish brown dusted 

 with waxy powder. 



This species is a victim of several species of minute hymenopterous 



