68 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Myzus cerasi Fab. Plate IX, fig. 54. 



Head and antennse black, latter imbricated. Length of seg- 

 ments : I, 0.10 mm. ; II, 0.07 mm. ; III, 0.45 ram. ; IV, 0.32 

 mm.; V, 0.25 mm.; VI, 0.10 mm.; VII, 0.41 mm.; total 

 length of antennse, 1.70 mm., or extending a little farther than 

 to the abdomen. Sensoria circular, about twelve to the third 

 joint, nearly in a row ; absent on the fourth, but the usual one 

 present near the distal end of the fifth ; a cluster of about six 

 on the distal end of the sixth and the base of the seventh. 

 These vary in size and are each mounted with small, numerous 

 hairs. Eyes black ; ocular tubercles prominent, tinged with 

 red ; ocelli normal. Beak black, 0.45 mm. long, extending to 

 the mesocoxse. 



Prothorax black ; a small elevation marks the location of the 

 absent tubercles. Thorax black. Wings hyaline, venation 

 brownish and slender; stigma, 0.63 mm. long by 0.10 mm. 

 broad. Total wing expansion, 5.90 mm. Legs black, hirsute ; 

 color lightest on the tibia to near the distal end. 



Abdomen black, short, and broad, which gives it an ovoid 

 appearance. Honey-tubes black, imbricated, and incrassate, 

 being twice as wide at the base as near the distal end ; latter 

 funnel-shaped; entire length, 0.41 mm., or about four times 

 the length of the tarsum. Style black, covered with short spines 

 and a few hairs. It is conical in shape, and 0.14 mm. long, 

 boing about four times the length of the honey-tubes. Total 

 length of the body, 2.08 mm. 



This form was taken June 16, on the cultivated cherry. It 

 is grregarious, colonizing the leaves, and when quite numerous 

 also the tender twigs. They are quite conspicuous, being black 

 on a green plant. In general appearance the wingless, how- 

 ever, are more of a brownish cast. Whole colonies of these 

 have been totally exterminated here in only a few days, sup- 

 posedly from the action of some parasitic enemy. 



Myzus persicae Sulz. Plate XVI, fig. 81. 



Head black. Antennrt^ black and with but few hairs; length 

 of joints: I, 0.14 mm.; II, 0.09 mm.; Ill, 0.68 mm.; IV, 0.61 

 mm.; V, 0.43 mm.; VI, 0.18 mm.; VII, 0.72 mm.; total 

 length, 2.85 mm., extending beyond the abdomen about the 

 length of the honey-tubes. Sensoria circular ; twelve to four- 



