64 Thomas Albert Williams 



this species. It belongs to Myzus, as is shown by the porrect 

 tubercles. 



79. Myzus cerasi (Fabricius). 



On cultivated plum, Lincoln, May 17, 1889, specimen no. 102, 

 University of Nebraska collection. 



80. Myzus oenotherae n. sp. 



Apterous form: General color pea green. Antennae as long as or longer 

 than the body, pale, tips of III and IV, outer half of V and VI and VII 

 black ; VII rather longer than III ; I and tubercle gibbous on the inner 

 side. Eyes red. Legs yellowish green, hairy, tarsi and lower end of tibiae 

 blackish. Honey tubes long, slender, dusky at tip, reaching beyond the 

 tip, of abdomen. Tail concolorous with abdomen, rather more than half 

 the honey tubes in length, rather acute, curved upwards, hairy. 



Pupa: Similar to apterous form but with shorter antennae; VII longest; 

 tail shorter; legs paler, and body more elongate. 



Winged female: General color as in apterous form. Head and thorax 

 with a pinkish tinge. Antennae more slender, paler; III with a single 

 row of sensoria ; VII minutely annulate. Eyes very dark red or black. 

 Beak reaching midway between second and third pair of coxae. Wings 

 with yellowish insertions, rather heavy, punctate, with moderately heavy 

 veins; second branch of cubitus beginning somewhat nearer the first 

 branch than to the apex of the wing. Stigma yellowish white. Stigmal 

 vein sharply curved for at least two thirds its length. Legs yellowish 

 green, with dusky joints and tarsi. Honey tubes and tail as in apterous 

 except that the former are minutely annulated. Length of body about 

 2 mm. 



Winged male: Smaller than female; antennae darker; I, II and base of 

 III pale, all the remainder black ; wings clearer and more delicate ; legs 

 generally darker. Length of body about 1.80 mm. 



All forms more or less covered with capitate hairs. Antennal 

 tubercles not so conspicuously gibbous in the winged forms as in 

 the apterous form or pupae. This is one of the species of Myzus 

 that shows a decided connection between that genus and Si p lion 0- 

 phora and makes it doubtful if the former should be separated 

 from the latter. This species is similar in general appearance to 

 M. potentillae. It is, however, a much larger insect and differs 

 from that species in many other respects, as will be seen in the 

 description. 



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