60 KANSAS UNIVERSITY SCIENCE BULLETIN. 



tal length, 1.45 mm., extending to the central part of the abdo- 

 men. Sensoria few and circular ; the usual distal one on the 

 fifth, and the cluster of six or seven at the distal end of the 

 sixth. Eyes black ; ocular tubercles prominent ; ocelli absent, 

 or if present not conspicuous. Beak black, 0.28 mm. long, 

 extending to the abdomen. 



Prothorax black; has conspicuous lateral tubercles. Thorax 

 black. Legs all black except the proximal two-thirds of the 

 tibia, which is of a light color. 



Abdomen black. Honey-tubes black, incrassate, thickest 

 near the base and tapering toward the distal end, where they 

 sometimes dilate into an imperfect knob; length, 0.27 mm., 

 being about three times the length of the tarsum. Style light- 

 colored, hirsute, and 0.18 mm. long, or two-thirds the length 

 of the honey-tubes. Total length of the body, 1.99 mm. ; width 

 at the thorax, 0.90 mm. 



This form was taken May 7, on the cultivated plum {Pnnnis 

 sp. ?). It is gregarious and colonizes the leaves, sometimes 

 corrugating them. 



Aphis sambuci Linn. Plate X, fig. 60. 



Head black. Antenna^ black, slightly hirsute ; length of seg- 

 ments : I, 0.07 mm. ; II, 0.07 mm. ; III, 0.25 mm. ; IV, 0.23 

 mm.; V, 0.18 mm.; VI, 0.12 mm.; VII, 0.34 mm.; total 

 length, 1.23 mm., extending to the honey-tubes. Sensoria cir- 

 cular, unequal in size, and twenty to twenty-five on the third 

 joint, from one to five on the fourth, about three on the fifth, 

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

 black ; ocular tubercles prominent ; ocelli normal. Beak black, 

 discoidals bounded caudad with a narrow dark line. Stigma 

 dark, 0.14 mm. broad and 0.54 mm. long. Total wing expan- 

 sion, 6.72 mm. Tarsi, distal part of the tibia and femora black ; 

 remainder brown. 



Abdomen slate-colored. Honey-tubes black, imbricated, cyl- 

 indrical, and dilated at the distal end, forming a flat rim ; 

 length, 0.37 mm., or about four and one-half times the length 

 of the tarsum. Style black, bluntly rounded at the end, hirsute, 

 and armed with small spines. Length, 0.12 mm., or about 

 one-third the length of the honey-tubes. 



This form was taken June 15, on the elder {Samhucus rana- 



