SANBORN : KANSAS APHIDID.E. 53 



Total wing expansion, 6.70 mm. Prothoracic legs light brown, 

 femora and tarsi of mesa- and metathoracic legs black, tibiae 

 light brown. 



Abdomen slightly hirsute, grayish, with about eight indis- 

 tinct transverse black bars, and a black patch at the base of 

 each honey-tube. Along the lateral margin are eight lateral 

 tubercles. The honey-tubes are black , slightly clavate, and 0.36 

 mm. long, or about three times the length of the tarsi. Style 

 hirsute, all black except a small semicircle at the base, 0.11 

 mm. long, or about one-third as long as the honey-tubes. It is 

 bluntly rounded distally. 



This form was taken .June 15. It is gregarious in its habits, 

 colonizing the terminal leaves of the elder (S. canadensis) . It 

 is similar in its work to the Chaitophoms neg imdinis , in that it 

 is attended by ants and secretes so much honeydew that the 

 growth of the plant is finally checked for a time. It has pre- 

 viously been considered that the A. sarnbuci Linn, and the A. 

 samhncifolia Fitch were synonymous, but with this form and 

 that of figure 60 at hand, a difference is apparent. 



Aphis cratsegifolia Fitch. Plate XIII, fig. 74. 



Head black. Antenn^ie black, slightly hirsute, first joint 

 glabrous ; length of joints : I, 0.036 mm. ; II, 0.05 mm. ; III, 

 0.27 mm. ; IV, 0.16 mm. ; V, 0.145 mm. ; VI, 0.17 mm. ; VII, 

 0.31 mm. ; total length, 1.04 mm., extending near to the center 

 of the abdomen. Sensoria circular and moderately small ; 

 about fifteen on the third joint, seven nearly in a row on the 

 fourth, one sm'all near the center and one large near the distal 

 end of the fifth, and a cluster of four or five at the distal end of 

 the sixth. Eyes dark red; ocular tubercles of a lighter red, 

 and equal in size to the lateral tubercles. Distal half of the 

 second segment of the beak black, remainder brownish yellow. 

 It extends to the mesocoxcC, being 0.45 mm. long. 



Prothorax brownish black ; sclerites of the thorax black, 

 membrane dusky. Wings hyaline, veins slender and slightly 

 dusky. Subcostal and first discoidal slightly dusky until near 

 the base of the stigma, where subcostal becomes more dusky, 

 especially along the caudal margin to the distal end of the 

 stigma. The latter is dusky gray, 0.67 mm. long and 0.127 

 mm. wide. In many specimens the cubitus is only once 



