FOUR RARE APHID GENERA FROM MAINE. 243 



However on June n, 1908, a large collection of pale green 

 pupae on the tips of balsam fir was brought to me. Many of 

 these molted during the night and the winged aphids proved 

 to be Mindarus and to all appearances abietinus Koch described 

 from Abies in Europe. On June 14, 1909, a large collection of 

 pupae was made by the writer from balsam fir and winged 

 forms were again secured. These accord with the type speci- 

 men of pinicola Thomas and it is probable that the pine and the 

 balsam Mindarus are the same species, though biological proof 

 is yet lacking. Late in May, 1910, Mindarus abietinus occurred 

 in enormous numbers at Orono both on balsam fir and spruce 

 (Picea canadensis). The new growth became badly "ruffled" 

 on infested twigs. 



Pupa'- Body pale green and very pulverulent. Total length 

 2 mm. Antenna pale proximal half, dusky distal half, extends 

 to middle of thorax. I, 0.075 mm. ; II, 0.06 mm. ; III, 0.21 mm. ; 

 IV, o.i i mm. ; V, 0.14 mm. ; VI, 0.165 mm. Eyes dark. Beak 

 extends to base of 3rd coxae. Wing pads a little dusky. Legs 

 . with femora and tibiae pale yellowish, tarsi dusky. Abdomen 

 with fine white silky tufts in lateral rows on each side. Eight 

 large wax gland areas occur in a lateral row on each side of 

 abdomen. Other similar areas occur on the dorsum. These 

 areas are somewhat circular and comprise about 80 or less 

 minute wax pores. Color description from live specimens. 

 Measurements and details from balsam mounts. Maine collec- 

 tion numbers 5-08 and 15-09. Figures 207, 211, 212. Habits 

 and Habitat. Curling new tips of balsam fir (Abies balsamea 

 Mill) and causing twip tips to look downy. Honey dew 

 excreted in large quantities. June. 



Migrant, Alate Viviparous $: Head pale green, eyes dark. 

 Beak extends to 3rd coxa. Antenna extends to abdomen. I, 

 0.06 mm.; II, 0.065 mm.; Ill, 0.36 mm.; IV, 0.225 mm - '> V, 

 0.23 mm.; VI, 0.225 mm. Ill with about 12 large quasi trans- 

 verse sensoria in an even row, extending nearly the whole length 

 of III. IV, V and VI each with large sensorium at distal por- 

 tion. The sensoria grouped about the large terminal sensorium 

 of VI are distinct and separate. Spur of VI about one-third the 

 length of the basal portion. IV, V, VI slightly imbricated. 

 Thorax brown dorsal and ventral. Wings pale with dark but 

 delicate veins. Stigma very long, curving to a point near distal 



