76 KANSAS UNIVERSITY SCIENCE BULLETIN. 



center and curved up at the tip, and 0.41 mm. long. Total 

 length of body, 3.36 mm. 



This form may be found in greenhouses during the growth 

 of the Bidens chrysanthemoides. It is gregarious on this plant, 

 colonizing the tender buds, stems, and leaves. It is also found 

 common in gardens where chrysanthemums are, especially the 

 white varieties. 



Macrosiphum erigeronensis Thomas. Plate XIX, fig 92. 



Head black. Antennte slightly hirsute, dusky except the first 

 two joints and base of the third joint; length of segments : I, 

 0.01mm.; II, 0.07 mm.; Ill, 0.54 mm.; IV, 0.46 mm.; V, 

 0.36 mm.; VI, 0.14 mm.; VII, 0.64 mm.; total length 2.40 

 mm., being about equal to the body in length. Sensoria circu- 

 lar, prominent, and numerous ; about forty on the third joint, 

 none on the fourth, the usual distal one on the fifth, about six 

 small and one large one at the distal end of the sixth. 



Thorax all of a deep, shiny green. Lateral tubercles present 

 in the apterous form but not conspicuous in the winged form. 

 Wings hyaline, veins dark ; discoidals frail. Stigma, 0.12 mm. 

 broad and 0.54 mm. long. Total wing expansion, 5.80 mm. 

 Proximal part of the femora yellowish brown, remainder of legs 

 black, slightly hirsute, and nearly normal in size. 



Abdomen of a shade lighter green than the thorax. Honey- 

 tubes dark, imbricated, and almost cylindrical, being widest at 

 the base ; length, 0.45 mm., or about three times the length of 

 the tarsi. Style dark green, slightly hirsute, armed with short 

 spines, ensiform, and 0.27 mm. long, or half the length of the 

 honey-tubes. 



This form was taken October 19, on fieabane {Erigeron cana- 

 dnsis). It is gregarious in habit and colonizes the tender, 

 growing parts. 



Macrosiphum sp. Plate XVII, fig. 86. 



Head and antennre brownish black. Antennae with a few 

 spreading hairs; length of segments: 1,0.12 mm.; 11,0.09 

 ram.; Ill, 0.77 mm; IV, 0.70 mm.; V, 0.63 mm.; VI, 0.18 mm.; 

 VII, 1.19 mm. ; total length, 3.58 ram., or nearly twice as long 

 as the body. Sensoria circular and unequal in size ; forty to 

 fifty on the third joint, none on the fourth, sixteen to twenty 

 on the fifth, the distal one the largest, and nearly all in a row ; 



