382 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 4 



in Colorado on both the sweet and sour cherries. It breeds very 

 rapidly early in the season, often nearly covering the foliage and 

 greatly injuring the crop. Figures 4 and 4a show the antenna and 

 cornicle of the alate viviparous female. 



Myzus ribis Linn. — This species was taken at Chicago and at 

 Webster, Mass., on the garden currant, Ribes rubrum. Fairly common 

 but not abundant about Fort Collins and Denver. Readily recog- 

 nized by its small size, yellow color, and the puffed red blisters of the 

 upper surface of the currant leaves caused by the punctures of the 

 lice upon the under surface. Figures 5 and 5a show the antenna and 

 cornicle of alate viviparous female taken at Fort Collins, 7-9- '07. 



Myzus rosarum Walk. — Abundant on rose bushes in Detroit and 

 Portland, Ore. An extremely abundant species on roses in Fort Col- 

 lins, often ruining the flowers, or even the buds before they open. 

 Especially bad on the climbers. The antenna of the alate viviparous 

 form taken at Fort Collins, 6-10- '09, is shown at figure 6, the cornicle 

 at 6a. The hind tibia of an oviparous female is shown at figure Z and 

 the cornicle at 7a. The last was taken from rose at Fort Collins, 

 November 5, 1909. We have also taken this species upon cultivated 

 strawberry and upon Potentilla sp. Several males and females have 

 been taken on all the above. 



Myzus persicK Sulz.^ — This louse was only noted at Webster on 

 garden vegetables, though it is probably common through most of 

 the states traversed. It is abundant every year in Colorado. The 

 peach and plum are the chief fall, winter and spring hosts, though a 

 considerable proportion of the fall lice remain viviparous and hiber- 

 nate on various herbaceous plants out of doors and upon various green- 

 house plants, notably the snapdragons and the carnations indoors. 

 See illustrations in Plate 6, of Journal of Economic Entomology, 

 October, 1908. 



Phorodon humuli Sch. — Taken on hop vines at Detroit and at 

 Webster. This louse is fairly common on both eastern and western 

 slopes in Colorado and we have known it to remain on the plum in 

 small numbers throughout the summer. I have never seen it injuri- 

 ously abundant on the plum in this state. Specimens from Sussex, 

 Eng., sent by Professor Cockerell, seem in every way like our American 

 examples. The antenna and cornicle of the alate summer form are 

 shown in figures 8 and 8a. 



Macrosiphurn tanaceti Linn. — Taken at Webster, Mass., and 

 Kansas City by Mr. Bragg from Tanacetum vulgare; very abundant. 

 The entirely black antennae, cornicles, cauda and legs; the straight, 



'For illustrations of this species see Bulletin 133 Col. Exp. Sta. or Journal of 

 Economic Entomology, 1908. p. 359. 



