SANBORN : KANSAS APHIDID.E. 59 



mm. ; total length, 1.10 mm., distal end of the sixth joint ex- 

 tending to the abdomen. Sensoria circular, about eighteen or 

 twenty on the third, four on the fourth, sometimes in a row, 

 three or four on the fifth, six small with one large at the distal 

 end of the sixth. Eyes black ; ocular tubercles prominent ; 

 ocelli present, frontal one conspicuous, others not very con- 

 spicuous. Beak dark, 0.35 mm. long, extending to the mesa- 

 thorax. 



Prothorax black, lateral tubercles small and conspicuous. 

 Thorax black; wings subhyaline, veins rather frail. Stigma 

 black, 0.16 mm. broad and 0.99 mm. long. Total wing expan- 

 sion, 7.68 mm. Legs black, slightly hirsute. 



Abdomen bluish green, with five black spots on each lateral 

 margin, also three black but not very distinct transverse bars 

 caudad the honey-tubes. One lateral tubercle on each margin 

 of the basal lergum ; one on each of the two first terga caudad 

 the honey-tubes. These tubercles are all about equal to the 

 prothoracic tubercles in size. Honey-tubes black, imbricated, 

 slightly dilated in the middle and expanded at the rim. Each 

 is located in a black patch. At the cephalic base of each tube 

 is a small semicircular brownish patch. Length, 0.16 mm., 

 not extending to the base of the style, and but little longer 

 than the style. Latter black on the distal half, with the color 

 extending cephalad along the margin to the base. Cephalic 

 half in this margin concolorous with the abdomen. Armed 

 with few hairs and numerous small spines. The distal end is 

 turned dorsad. Length, 0.12 mm., being half the length of the 

 tarsi. Total length of the body, 2.35 mm. 



This form was taken September 4, on cultivated corn {Zea 

 mays). It is gregarious, and attacks the corn in practically 

 the same manner as the chinch-bug. It is most numerous on 

 the distal joint of the stalk, being protected by the sheath of 

 the last leaf. 



Aphis cerasifolise Fitch. Plate X, fig. 59. 



Description from an apterous, viviparous form. 



Head black. Antennse black except the third and sometimes 

 the fourth joint, which is of a light color ; all slightly hirsute ; 

 length of segments : I, 0.09 mm.; II, 0.07 mm.; Ill, 0.89 mm.; 

 IV, 0.23 mm. ; V, 0.23 mm. ; VI, 0.09 mm. ; VII, 0.54 mm. ; to- 



