70 THE CANADIAN ENTOMOLOGIST. 



Cornicles, 0.50 mm.; Wing expanse, 7.50 + mm.; Beak extending to 

 mesocoxae. 



Antennae dark, III. and IV. with sensoria, hairs capitate; legs 

 light, tips of femora and tibia, and tarsi dark, some of hairs on legs 

 capitate; cornicles straight, cylindrical, reaching to or slightly beyond 

 tip of cauda, darkish at bases and tips, cauda dark ; lateral edges of 

 abdomen with black spots, abdominal segments banded and irregularly 

 marked with dark, bases of setae in lateral spots and of two dorsal setae 

 on caudal segments, large and conspicuous. Two specimens. 



Apterous Viviparous Female. 



Length, 2.5 mm.; width, 1.30 mm.; antenna?, 2.65 mm.; III., 0.63 

 mm, IV., 0.48 mm., V., 0.38 mm., VI., 0.10 mm., VII., 0.92 mm.; 

 Tibia, I., 1.2 mm., II., 1.35 mm., III., 1.70 mm.; Cauda, 0.28 mm.; 

 Cornicles, 0.57 mm.; Rostrum extending to between meso- and meta- 

 coxae. 



Antennae light, joints, tip of V., VI. and VII. dark, III. with 

 sensoria, abdomen unmarked. One specimen.* 



This species is readily distinguished from the allied American 

 JVectarop/iora described above by the sensoria on IV. of the antennae of 

 the winged female, and by the larger number (12 or so) of sensoria on 

 III. of the apterous female. 



Kaltenbach and Buckton both consider 6". lactucce., Koch., as prob- 

 ably S. sonchii, Linn. 



Rhopalosiphum ribis, Koch., is probably Myzus ribis. 



Rhopalosiphum lactucce, Kalt. 



(PI. III., 9.) This species was taken October 27, 1899, on Sonchus 

 oleraceus at Newark, Del., in large numbers, and was kindly determined 

 by Mr. Th. Pergande. It corresponds closely to Buckton's description. 

 Many of the nymphs and pupae were pink. No search was made for the 

 sexes at the time, but several males have been found in the preserved 

 material. No oviparous females were found, and apterous females were 

 scarce. The males and winged females seem to be almost absolutely 

 alike in size and markings. 



Winged Male. — Length, 2.20 mm.; width, 1.00 mm.; antennae, 2.95 

 mm., III., 0.71 mm., IV, 0.51 mm., V. 0.46 mm., VI., 0.12 mm., VII., 



:; The number of specimens mentioned under each species refers to the number 

 of perfect specimens from which the description was drawn ; a much larger number 

 are preserved of most of them. 



