SANBORN : KANSAS APHIDID.E. 75 



black. The thorax is dark brown. The wings are hyaline 

 with light brown veins, which in this species are often quite 

 anomalous, i. e., having secondary branches. Stigma light 

 brown, 0.97 mm. long and 0.16 mm. wide. Total wing expan- 

 sion, 8.96 mm. Legs dark except the basal half of the femur, 

 which is a very light brown. They are also hirsute and long 

 in proportion to the body. 



Abdomen brown ; honey-tubes black, imbricated, and almost 

 cylindrical, 0.50 ram. long. Style concolorous with the abdo- 

 men, ensiform, hirsute, and 50 mm. long. Total length of 

 body, 2.70 mm. 



This form was taken October 6. It is gregarious, and may 

 be found on the tender parts and ventral sides of the leaves and 

 tender branches of White snakeroot {Eupatorium ageratoule-s) 

 as long as they contain sap. Described from a female speci- 

 men. For an illustration of an apterous, viviparous stem- 

 mother, see plate XXII, fig. 99. 



Macrosiphum, n. sp. Plate XXI, fig. 97. 



Head black. Antenna? black except the base of the third 

 joint, which is slightly pale ; length of the antennal segments : 

 I, 0.12 mm. : II, 0.05 mm. ; III, 0.77 mm. ; IV, 0.55 mm. ; V, 

 0.54 mm. ; VI, 0.14 mm. ; VII, 0.59 mm. ; total length, 3.15 

 mm. Sensoria of the third joint not distinct but numerous and 

 of moderate size, there being thirty to forty ; none on the 

 fourth ; a large one near the distal end of the fifth ; the usual 

 group present at the distal end of the sixth. Eyes are dark, 

 tinged with red. Ocular tubercles are prominent and bordered 

 with black. Beak dark, reaching to second coxa, and about 

 0.80 mm. in length. 



Prothorax dark, rather narrow, and long. Thorax dark, al- 

 most black. Wings hyaline, veins slender and brownish. 

 Stigma yellowish brown, 0.19 mm. broad by 0.90 mm. long. 

 Total wing expansion, 7.92 ram. Legs hirsute and black ex- 

 cept the proximal half of the femora. 



Abdomen greenish black ; honey-tubes black, cylindrical, im- 

 bricated, slightly trumpet-shaped at the tip, broader than this 

 at the base, and 0.72 mra. long, extending to the tip of the ab- 

 domen. Style pale brown, imbricated, hirsute, broadest in the 



