78 KANSAS UNIVERSITY SCIENCE BULLETIN. 



costal vein. la width the stigma is 0.14 mm., and in length 1.00 

 mm. Total wing expansion, 8.64 ram. Legs hirsute, black, 

 except proximal half of the femora. All long in proportion to 

 the body. 



Abdomen brownish black. Honey-tubes black, imbricated, 

 and 0.50 to 0.70 mm. long., being about four times the length of 

 the tarsi. Style black, hirsute, spinous, ensiform, and 0.30 mm. 

 long, being half the length of the honey-tubes. Total length of 

 the body, 2.37 mm. 



This form was taken October 25, on Actinomeris squarrosa. 

 It is gregarious in habit and colonizes the terminal stems. 



Myzus biennis, n. sp. Plate IX, fig. 51. 



Head light green. Antenntr concolorous except the third, 

 sixth, seventh and distal end of the fifth joint, which are 

 dark. Length of segments: I, 0.12 mm. ; II, 0.07 ram. ; III, 

 0.63 mra. ; IV, 0.46 mra. ; V, 0.48 mra. ; VI, 0.12 ram. ; VII, 

 0.81 mm. ; total length, 3.60 mra. Sensoria circular, unequal 

 in size; about twenty on the third joint, none on the fourth, 

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

 red ; ocular tubercles prominent ; ocelli present but not con- 

 spicuous. Beak dark at the distal end, 0.72 mra. long, extend- 

 ing to the metacoxii'. 



Prothorax green. Thorax green. Wings subhyaline, veins 

 dark, somewhat frail. Stigraa, 0.16 rara. broad and 0.66 mra. 

 long; total wing expansion, 6.52 rara. Legs hirsute, and con- 

 colorous except tarsi and the distal end of the tibia, which are 

 black, norraal for this genus. 



Abdoraen green. Honey-tube imbricated, cylindrical; con- 

 colorous except the distal end, which is dusky; length, 0.48 

 mra., being at least two and one-half tiraes the length of the 

 tarsi, extending to the apical segment of the abdomen. Style 

 concolorous, armed with numerous small spines and some long, 

 setaceous hairs, ensiforra, 0.34 rara. long, being about twice 

 the length of the tarsura. Total length of the body, 2.58 rara. 



This form was taken May 20, on primrose {(Enotliera biennis) . 

 It is gregarious and colonizes the terminal stems. 



Macrosiphum sp. ? Plate XII, fig. 70. 



Head dark brown. AntenraL^ black, except the second joint 

 and the base of the third ; length of joints : I, 0.12 rara. ; II, 



