84 MAINE AGRICULTURAL EXPERIMENT STATION. I913. 



on dorsal surface of leaves of balsam poplar turning the edges 

 slightly upward. A'eazie, July 18, 1912. 



Macrosiphum laevigatae Essig. In 19 10 a colony of 

 Macrosiphum was collected on the campus here at Orono since 

 described from California as laevigatae. They were found on 

 the ventral side of the tender tip leaves of willows at the rear 

 of campus heating plant. Only apterous viviparous females 

 and nymphs were taken that season, collection 78-10, but July 

 16, 1912, winged forms were found on Salix at Orono, col- 

 lection 87-12. 



The apterous viviparous female has a light greenish yellow 

 head; antennae (Fig. 40) with I, II, and III except articulation 

 pale, and IV- VI black, III with 3 to 5 inconspicuous sensoria 

 near base ; eyes black, thorax, abdomen almost white with 

 greenish yellow tinge and with a vivid green longitudinal line 

 extending from prothorax to the fifth or sixth segment of 

 abdomen wdiere it sometimes stops abruptly ; cornicles longer 

 than antennal III, concolorous at base and dusky at tip which is 

 distinctly though irregularly reticulated for a distance equaling 

 about one-ninth the length of cornicle, the basal eight-ninths 

 being comparatively smooth (Fig. 42) ; style concolorous with 

 abdomen. There is a minute lateral abdominal tubercle just 

 cephalad the base of the cornicle. 



The winged viviparous female has about 10 delicate sensoria 

 on basal half of antennal III. Fig. 41, drawn to the same scale 

 as Fig. 42. 



Fig. 40. M. laevigatae. Antenna of apterous female. Fig. 41. 

 Joint III of antenna of alate female. Fig. 42. Cornicle of apterous 

 female. 



