298 MAINE AGRICULTURAL EXPERIMENT STATION. 



base of larch cones in flocculent matter. When these molt 

 they prove to be brown bodied with a caudal flocculent tuft 

 and greenish wings. These winged forms I am unable to sep- 

 arate on microscopic comparison from consolidatus (Figs. 123 

 and 124), and think that there is no reason to doubt that they 

 are the same species, and that the larch and spruce are alter- 

 nate hosts of consolidatus. 



Whether they prove to be strobilobius Kalt. can only be 

 ascertained by comparison with authentic European material 

 which is not at present available. 



Pupa. The pupa, described from specimens removed from spruce 

 galls. -(Fig. 125). Body dark red and flocculent, the larger 

 ones 1.2 mm. long. Areas of dorsal wax pores; head with 

 large groups at anterior and posterior margin; prothorax 

 with lateral areas, a row of 4 large anterior and 4 large posterior 

 groups; mesothorax with a curved transverse row of six well 

 denned groups, the outer ones forming the usual anterior-lateral 

 groups, metathorax and abdominal segments I-VI with trans- 

 verse rows of 6 groups each, VII-IX with only the marginal 

 group. Fig. 125 was drawn from a pupa in its last stage but 

 sometime before it molted. Later the conspicuous circular space 

 about the gland openings is not so discernable. 



The Migrant from the Spruce Gall. (Fig. 123). Length .9 

 mm. -i. 3mm.; wing expanse 3.5 mm.-4.o mm. The wings 

 of this species are very rotund. The veins in the fore wing 

 are usually like those given in fig. 123 though frequently they 

 are straighter. M in the hind wing usually curves with the 

 concavity distad though sometimes this vein is nearly straight. 



The most striking structural distinction between this and 

 the other 5 spruce Chermes is in the antennae. The constric- 

 tions between joints III, IV, V are very inconspicuous so that 

 these joints from some positions appear almost to be consolidated 

 into a single long terminal joint. It was this character that 

 suggested the specific name. The antennae of consolidatus are 

 distinctive in one other respect, two of the four terminal hairs 

 are developed into strong spines (Fig. I24a). This is not true of 

 any of the other 5 spruce species. 



