3OO MAINE AGRICULTURAL EXPERIMENT STATION. 1909. 



and small anterior groups; metathorax with 2 median groups 

 in line with these on head and pro- and meso- thorax and abdo- 

 men; abdomen with lateral groups on segments I-VIII, large 

 median groups on segments I to VI and a row midway between 

 the lateral and median groups on I to VI. None of the pore- 

 groups are merged in the pupa. 



Migrants from spruce gall to pine. (Fig. 1 10) 1.5 mm.-2. i mm. 

 long with wing expanse 5. o-mm.-5.6 mm. Freshly molted indi- 

 viduals have a yellowish red body and pale buff wings. The 

 antennae are characterized by the exceedingly large sensoria 

 on joints III, IV, V. Each sensorium comprises the entire 

 surface of the joint except the extreme proximal and distal 

 portions and a narrow ridge connecting these. The constric- 

 tions between joints are abrupt. Ill and IV are subequal 

 and V is longer and not so thick. The wings are rather narrow, 

 ist A in the fore wing curves, the convexity being distad. M 

 of the hind wing curves, the concavity being distad. Large 

 wax gland areas occur on head and the three thoracic segments. 

 On the abdomen lateral groups are present on perfectly dis- 

 tinct darkened areas on segments I-VII, IV, V, and VI are trans- 

 versely banded by wax pores across the dorsum. Merged median 

 groups occur on I, II, III and on III a separate group (some- 

 times absent) midway between the median and lateral groups^ 

 I and II are without wax areas between the median and lateral 

 groups. 



These winged forms migrate, from the middle to the last of 

 July near Orono, to pine needles where they oviposite .(Fig. 133.) 

 The* ovipositing females secrete considerable wax from head 

 glands as well as over the rest of the body so that they are a 

 decidedly flocculent and not pulverulent species. This character 

 alone would distinguish them from pinifoliae and is chosen 

 for the specific name on that account. 



In the woods these migrants were found abundant on the 

 white pine needles over egg clusters of about 40 eggs. Coming 

 so much later in the season floccus finds both old and new growth 

 pine needles available and deposits the egg mass indifferently 

 on the old or new. Pinifoliae migrants occur in this region 

 only on needles of previous years growth as they appear the 

 middle of June. 



Chermes floccus migrants are not so particular as pinifoliae 

 as to which way they are headed, some migrants settling on 



