SANBORN : KANSAS APHIDID.E. 73 



0.23 mm. long, being one-half the length of the honey-tubes. 

 Total length of the body, 1.98 mm. 



This seems to be a male form, and was taken June 21, on the 

 wing. Data not sufficient for identification. 



Macrosiphum, n. sp. Plate XX, fig. 93. 



Head dark green. Antennae black, slightly hirsute ; length 

 of segments : I, 0.18 mm. ; II, 0.09 mm. ; III, 0.86 mm. ; IV, 

 0.12 mm. ; V, 0.82 mm. ; VI, 0.18 mm. ; VII, 1.09 mm. ; total 

 length, 3.34 mm., the fifth joint extending to the tip of the ab- 

 domen. Sensoria circular, unequal in size ; about twenty-five 

 on the third, none on the fourth, the usual distal one on the 

 fifth, six small and one large, the latter equal to the distal fifth, 

 on the distal end of the sixth. Eyes black ; ocular tubercles 

 prominent; ocelli present, bordered with black. Beak dark, 

 0.63 mm. long, extending nearly to the mesocoxse. 



Thorax all dark green. Wings hyaline ; the first two dis- 

 coidals strong, the first bordered with a conspicuous border of 

 black as wide as the vein itself; second also bordered with the 

 same but fainter. The cubitus and stigmal vein not bordered 

 but somewhat frail. Stigma dark gray, black along the caudal 

 margin; length, 1.28 mm.; breadth, 0.18 mm. Total wing 

 expansion, 7.68 mm. Legs long, slightly hirsute ; tarsi, tibia 

 and distal half of the femora black, remainder greenish brown. 



Abdomen reddish brown. Honey-tubes black, cylindrical, 

 slightly dilated at the distal extremity, 0.73 mm. long, or four 

 and one-half times the length of the tarsi, extending to the 

 distal end of the style ; the latter dark green, with a few long 

 hairs and numerous short spines. The distal hair is capitate ; 

 length, 0.32 mm., or twice the length of the tarsum. Total 

 length of the body, 2.70 mm. 



This form was taken October 25, on the box-elder (Negnndo 

 aceroides) . It is gregarious in habit and colonizes the ventral 

 side of the leaves. 



Macrosiphum chrysanthemi Oestlund. Plate XVII, fig. 85. 



Head brownish black. Antenme all dark except base of the 

 third joint which is of a clearer brown. All the joints are 

 hirsute. The I is 0.12 mm. long; II, 0.072 mm.; Ill, 0.59 

 mm. ; IV, 0.34 mm. ; V, 0.32 mm. ; A'l, 0.109 mm. ; VII, 0.54 



