December, "08] 



JOURNAL OF ECONOMIC ENTOMOLOGY 



359 



NOTES AND DESCRIPTIONS OF SOME ORCHARD PLANT 

 LICE OF THE FAMILY APHIDIDAE 



By C. P. Gillette 



(Continued) 



The Green Peach-Aphis, Myzus-persicae, Plate 8, Figs. 4 to 11. 



Some of the More Important Literature 



Aphis pcrsiciB Sulz., Kennzeichen Insecten, p. 105, 1761. 



Aphis diaiithi Schr., Fauna Boica, II, 1801. 



Aphis dianthi Schr., Mouograpbie der Fam. Pflanzenlause, Kalt., p. 42, 1843. 



Rhopalosiphum dianthi Schr., Die Pflanzenbuise, Koch, p. 42, 1857. 



Myzus prrsiccc Sulz., British Aphides, Buclvton, I, p. 178, 1876. 



Megoura solan i Tho8., Eighth Rep. Ent. III., p. 73. 1879. 



MU!Siis pcrsiew Sulz., Thomas, Eighth Rep. Ent. 111., p. 76, 1879. 



Siphonophora achyiantes Monell, Bull. U. S. Geol. Sur. Vol. V, No. 1, p. 18, 

 1879. 



MyzHS nialvw Oest., Geol. Sur. Minn., 14th Rep., p. 31, 1886. 



MyzKS persicw Sulz., Taylor, Jour. Ec. Ent., I, p. 83, 1908. 



Myzus pcrsicw Sulz., Gillette and Taylor, Bull. 133 and 134, Colo. Exp. Sta., 

 1908. 



This louse h&s the widest range of food plants of any species known 

 to me, and it is peculiar in possessing cylindrical cornicles in the 

 spring migrant and distinctly swollen cornicles in the return migrant 

 and the male in the fall. This difference in cornicles, the wide range 

 of food plants, and the remarkable variations in color, together with 

 only a partial knowledge of the life-history by the different writers, 

 fully explain how it is that this louse has been described under so 

 many different names in Europe and America. 



Young Stem-Mother — before first moult; Plate 8, fig. 4. 



Specimens from peach and native plum. Fort Collins, Col., March 25, 1908. 



Color dull and rather dark green, becoming lighter, tinged with yellowish, 

 as it feeds and grows; head, legs and antennae somewhat dusky brown in 

 color; on the middle of the head a pale median line; eyes dark red. 



MEASUREMENTS OF SIX STEM-MOTHERS THAT HAD GROWN LITTLE IF AT ALL, RAN AS FOLLOWS: 



