REPORT OF THE STATE ENTOMOLOGIST 223 



Observations made on isolated individuals* at Washington showed that 

 " the newly-hatched larvae after crawling about for a few hours, settle 

 down and commence at once to form a scale, which is white and fibrous. 

 In two days the insect becomes in visible, being covered with a pale, grayish- 

 yellow shield with a projecting white nipple at tlie center. * # # 

 Twelve days after hatching, the first skin is cast. * * * In 

 20 to 21 days after hatching, the females cast their second 

 skin. At 24 days the males begin to issue. * * * At 30 days 

 the females are about full grown, and embryonic young can be seen 

 within their bodies; and at from ;^^ to 40 days the larvae begin to make 

 their appearance." For additional observations on the development of 

 other broods, see Howard, Insect Life, vii, pp. 288, 289. 



From the first brood hatching early in June, a second is undoubtedly 

 disclosed in July. How many follow, has not been ascertained. 

 Matthew Cooke has placed the number during the season at three — the 

 first in June, the second in July, and the third in October; but it would 

 seem that the high temperature of summer could hardly fail of develop- 

 ing at least one additional brood intermediate to those of July and 

 October. Four broods were developed at Washington from over- 

 wintered females, and it was thought that there were ordinarily five. 

 They soon became so inextricably mixed that the only importance that 

 could attach to a determination of their number, would be as indicating 

 the rapidity of increase of the insect in different localities and under 

 different seasonal conditions. 



The females continue to feed until prevented by the dormancy of the 



tree in the late autumn. It is thought that most of them pass the winter 



in about a half-grown stage, and resume their feeding in early spring, as 



soon as practicable for their entrance upon active life, in June as above 



stated. 



Its Food-plants. 



In addition to the food-plants of the San Jose scale that have been 

 mentioned in the preceding pages, several others have recently been 

 reported to me by Mr. Sirrine, as observed by him on Long Island. 



The following is the list as it now stands. It will doubtless be largely 



extended by future observations : 



^. , . LegiiminoSiS 



TthacecB Acacia. 



Linden {Tilia). Rosacecz 



Almond. 

 Celastracecs Peach. 



Euonymus. Apricot. 



