APHID PESTS OF MAINE, il. WILLOW FAMILY. 85 



Melanoxantherium bicolor Oestlund. A species which I 

 take to be bicolor is not uncommon here on Balsam Poplar. 



Apterous viviparous female. Head reddish brown. Eyes 

 black. Antenna with proximal part ding}- yellow and distal 

 part black. Spur much longer than basal VI. Prothorax and 

 thorax reddish brown, lateral tubercles prominent. Fig. 44 A. 

 Legs with femora dingy yellow and tibiae and tarsi black. Abdo- 

 men dark mottled reddish brown with pale inconspicuous median 

 dorsal line, lateral tubercles prominent. Cornicles light dingy 

 yellow like femora and longer and more slender than in 

 sinithiae. (51-10). Pwpa colored like the apterous female. 



Alate viviparous female. Head reddish brown. Antenna 

 (Fig. 43) with spur much longer than basal VI. Prothorax 

 reddish brown, lateral tubercles prominent, Fig. 44 A. Thorax 

 reddish brown. Wings with pale slender veins and light brown 

 stigma. Legs with brownish yellow femora and tibise tipped 

 with black, tarsi black. Abdomen reddish brown, cornicles 

 light, dull brownish yellow. Fig. 45 A. Only a slight indica- 

 tion of a median dorsal line toward tip of abdomen. The 

 young progeny of this form have a median grayish dorsal line 

 the whole length of the body. (34-06). 



ABC D E 



Fig. 44. Melanoxantherium. Prothoracic tubercles all drawn to 

 the same scale. A, bicolor, apterous viviparous; B, saliciti, alate 

 viviparous; C, smithiae, alate viviparous; D and E, salicis, apterous 

 viviparous. 



Collection data: — 4-04 (in part). Orono, ^May 26, 1904. 

 Winged specimens of both this species and smithiae were fairly 

 abundant resting on the upper side of cultivated currant leaves. 



