442 MAINE AGRICULTUR.\I, EXPERIMENT STATION. I912. 



of fall, to the twigs and trunk where they spend the winter. 

 This insect has a wide distribution in the United States occur- 

 ring both east and west of the Mississippi. They were very 

 abundant in the vicinity of Orono, Maine, last year (1912) 

 being especially conspicuous during early summer upon the 

 trunks around the pruning wounds of the American elms. 

 Remedies. As for the Oyster shell scale. 



Phenacoccus acericola. 



MAPEE PHENACOCCUS. (FIG. 481.) 



King. Canadian Entomologist. XXXIV, p. 211, 1902. 





o _;v 



6 



^-C 



Fig. 481. Phenacoccus acericola: . a^adult female, greatly enlarged; 

 &==antenna of same still more enlarged; c:=adult male, greatly enlarged; 

 (/z^young larva, greaty enlarged; i7=rantenna of same still more enlarged. 

 (After Howard. Insect Life. 1894. 7 : 22,7). 



Comstock. U. S. Dept. Agr. Rept. '80, p. 345, 1881. {P. aceris). 

 Felt. Insects Affecting Park and Woodland Trees, 182, 1905. 



"Our American species when seen on the leaves appear as an irregular 

 oval cottony mass which adheres to anything touching it and resembles 

 very much the cottony ovisac of a Piilvinai'ia.. The cottony material is 

 about 6 mm. in diameter and covers the insect and her eggs. 



"Length of $ about 5 mm. long, 3 broad, plump, light yellow. Boiled 

 in caustic potash, they turn orange red. The internal juice pressed out, 

 the skin is colourless. The upper surface of the body is more or less 

 covered with spinnerets and these are more dense at the posterior 



