68 Thomas Albert Williams 



Buckton, Mon. Brit. Aph., I, p. 150, pi. XXII (bis) (1876). Sipho- 

 nophora rosarum. 



Oestlund, List Aph. Minn., p. 30 (1886). Myzus potentillae. 



Oestlund, Syn. Aph. Minn., p. 73 (1887). Myzus rosarum. 

 Apterous viviparous female: Elongate oval. Bright green. Antennae 

 and legs rather short. Frontal tubercles gibbous, of medium size. Dor- 

 sum more or less tuberculate and with capitate hairs arising from the 

 tubercles. Front with a tuft of large capitate hairs. Eyes reddish brown. 

 Segments of the abdomen plainly distinguished. Honey tubes slightly 

 swollen near the tips. Tail short, green. 



Winged viviparous female: General color green. The bristles of the 

 apterous form wanting. Head and thoracic lobes black. Antennae about 

 as long as the body; III longest, blackish. Beak reaching middle coxae. 

 Wings rounded, with smoky black veins, which have narrow smoky mar- 

 gins expanding at the apices of the veins. Legs black, with base of femora 

 and upper portion of tibiae yellowish. Abdomen green, with blackish mar- 

 ginal spots and transverse bands. Honey tubes green, sometimes dusky, 

 cylindrical, about three times as long as the tafsi. Tail short, acute, pale 

 green. Length of body about 2 mm. 



On roses in greenhouses and in the fields. Ashland, Lincoln, 

 Weeping Water, Omaha. I have found a form with the capitate 

 hairs almost entirely absent. 



Specimens in the collection of the U. S. National Museum 

 (no. 138). 

 85. Myzus thalictri n. sp. 



Apterous viviparous female: Clear green, with dusky legs and a large 

 dark green spot at the base of each honey tube, the latter dusky. 



Pupa: Rather paler green than the apterous form; more elongate in 

 shape; wing-pads dusky. Antennae in both forms rather shorter than the 

 body. 



Winged viviparous female: Green. Antennae as long as the body, dusky 

 to black. Head dusky. Eyes dark red. Neck and prothorax green. Thorax 

 dusky to black. Wings with rather robust brownish veins; discoidals 

 rather straight; first branch of cubital forming an almost straight line 

 with the upper part of the vein; second branch nearer to the apex of the 

 wing than to the first branch. Stigma yellowish. Stigmal vein sharply 

 curved its entire length. Subcostal very heavy, smoky. Abdomen green, 

 darker in the vicinity of the honey tubes. Legs dusky or sometimes pale, 

 with only joints and tarsi dusky. Honey tubes black, 0.62 mm. long. 



Winged male?: Smaller than female. Greenish yellow. Head larger, 

 antennae longer, tail shorter and whole body slenderer than in the female. 

 Abdomen with sides nearly straight and an irregular dark green band ex- 



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