308 SCHOOL ENTOMOLOGY 



jects from the head on the inside of the base, and a less 

 prominent one on the basal segment, of each antenna. 



The Rusty-brown Plum-louse * is readily distinguished 

 from others common on the plum and prune by its dark 

 rusty-brown color, with the base of the antennae, tibiae and 

 tail a contrasting white. This species has done considerable 

 injury in the Southwest and also in New England, so that it 

 is evidently widely distributed. It migrates to various com- 

 mon grasses upon which it feeds during the summer and 



FIG. 222. The black cherry-aphis (Myzus cerasi Fab.). (After 



GiUette and Taylor.) 

 1, apterous viviparous female; 2, winged viviparous female enlarged. 



returns to the plum in the fall. The wingless egg-laying 

 female and the male are almost black. 



The Black Cherry-louse f has long been known as a pest 

 of the cherry in all parts of the country, and seems to be 

 peculiar to this food-plant. Both the winged and wingless 

 forms are deep shining black, the body is rather broad and 

 flat and the honey-tubes are unusually long and cylindrical. 

 The habits of the species are somewhat like those of the 

 black peach aphis in the way in which the aphides cluster on 

 * Aphis setarice Thos. f Myzus cerasi Fab. 



