70 KANSAS UNIVERSITY SCIENCE BULLETIN. 



conspicuous. Beak light-colored, except the distal end, which 

 is dark ; length, 0.45 mm., extending to the mesocoxiie. 



Prothorax dark brown, short, and arched. Thorax dark 

 brown and arched slightly. Wings pellucid, veins dark brown. 

 Stigma dark brown, 0.12 ram. broad and 0.54 mm, long ; total 

 wing expansion, 5.40 mm. Legs hirsute; tarsi, distal part of 

 the tibia and the distal part of the femora black, remainder 

 light colored. Hind tibia a little long in proportion. 



Abdomen dark brown. On each lateral margin are at least 

 three tubercles. Honey-tubes concolorous, cylindrical, and im- 

 bricated like the antenme ; length, 0.28 mm., or about one and 

 one-half times the length of the tarsi. Style lighter in color 

 than the body, armed with numerous small spines and about 

 four long, setaceous hairs; length, 0.18 mm., or equal to the 

 tarsi in length. Total length of the body, 1.54 mm. 



This form was taken on the cultivated plum, July 9. It is 

 gregarious and colonizes the surface of the leaves, which causes 

 them to curl and form pseudogalls in which the aphids are 

 more or less protected from parasites. Ants were noticed to 

 patronize these colonies and to kill aphis-lions and ladybird 

 beetles which were trying to devour the aphids. 



Myzus achyrantes Monell. Plate IX, fig. 53 



Head and antenn;:© nearly black ; latter imbricated and al- 

 most naked. Length of segments : I, 0.12 mm.; II, 0.07 mm. ; 

 III, 0.55 mm. ; IV, 0.41 mm. ; V, 0.30 mm. ; VI, 0.12 mm. ; 

 VII, 0.54 ram. ; total length, 2.00 mm., or equal to the body in 

 length. Sensoria circular, unequal in size ; ten to the third 

 joint, none on the fourth, the usual distal one on the fifth, about 

 five and one large at the distal end of the sixth. Eyes dark 

 red ; ocular tubercles prominent ; cephalic ocellus prominent, 

 others not very conspicuous. Beak dark, and extends midway 

 between the pro- and mesocoxiP, being 0.45 mm, long. 



Thoracic sclerites all black. Wings hyaline, veins black. 

 Stigma, 0.12 mm. broad and 0.81 mm. long. Total wing expan- 

 sion, 3.60 mm. Distal half of the femur, distal part of tibia and 

 tarsi black, remainder pale brown. 



Abdomen has a background of yellowish brown, bordered on 

 the lateral margins with a black spot to each segment, and on 

 the dorsum with two, three or four spots on each of the first 



