74 KANSAS UNIVERSITY SCIENCE BULLETIN, 



mm. ; total length of antennip, about 1.88 mm., extending be- 

 yond the abdomen. Sensoria of third joint are rather large, 

 circular, irregular, and numerous, varying in number from 

 twenty to thirty ; sensoria of fourth about five in a row ; of 

 fifth, one near the distal end ; of sixth, six small and one large 

 sensorium at union of the seventh segment. Ocelli normal. 

 Beak smoky from near the distal end to near the middle ; distal 

 segment narrow and nearly uniform in width; total length, 

 0.54 mm., reaching to the second coxa. 



Prothorax brownish black ; cephalic boundary black. Lat- 

 eral tubercles very small. Thorax dark. Wings hyaline, 

 veins slender, not distinctly colored but of a blackish cast. 

 Third discoidal arising from the proximal part of the stigma, 

 and obsolete at the base. Stigma a little more dense than the 

 rest of the wing and darker in color, 0.63 mm. long and 0.09 

 mm. wide. Total wing expansion, 5.07 mm. Legs hirsute; 

 distal end of the tibia and the tarsus dark ; the proximal end 

 of the tibia and the femur black. All of the appendages seem 

 to be rather long in proportion to the remainder of the insect. 



The abdomen is a shade lighter brown than the rest of the 

 body, hirsute, more dense near the caudal part. Honey-tubes 

 black, imbricated, and slightly incrassate, 0.23 mm. long. 

 Style black, hirsute, and somewhat ensiform, 0.27 mm. long. 

 Total length of body, 1.50 to 1.60 mm. 



This form was taken May 80, 1903, on the common white 

 chrysanthemum. It is gregarious, and colonizes the terminal 

 buds and the tenderest stems, also the ventral side of the leaves. 



Macrosiphum ambrosiae Thomas. Plate XVIII, fig 87. 



Head light brown. Antenniie dark, hirsute; length of the 

 first joint, 0.09 mm. ; II, 0.09 mm. ; III, 0.86 ram. ; IV, 0.66 

 mm.; V, 0.60 mm.; VI, 0.14 mm.; VII, 1.28 mm.; total 

 length, 3.08 mm. The sensoria of the third joint are numer- 

 ous, varying from fifty to sixty ; on the fourth joint are about 

 twelve ; at the distal end of the fifth is the usual large one ; at 

 the distal end of the sixth is one large sensorium surrounded by 

 about three small ones. Eyes black with a tinge of brown. 

 Ocelli normal, three in number. Beak brown, last segment 

 dark, hirsute, 0.86 mm. long, extending to the mesocoxae. 



Prothorax light brown, except the cephalic margin, which is 



