268 Maine: agricultural experiment station. 1914. 



ROSA. 

 Macrosiphum rosae Linn, 



(Figure 93, A-C.) 



This world-wide Sipecies I took on the Maine Campus in 1905 

 and again in 19 14. 



The apterous form is striking on account of the contrasting 

 black and green in the coloring. General body color pale green 

 with ver)^ pale caiida; the antenna is dark and the long corni- 

 cles black; the legs with distal femora, distal tibiae, and tarsi 

 black, the rest green. Antennal III with proximal portion 

 somewhat bulkier than the rest and bearing sensoria as shown, 

 in the figure. The distal reticulations of the cornicle are 

 heavily marked and the area they cover is somewhat more 

 slender than the rest of the cornicle. 



The alate viviparous female has antennal III crowded with 

 sensoria, none on IV and only the ordinary terminal ones for 

 V and VI. The beak reaches second coxa. There is nothing 

 remarkable about the wings which are an ordinary Macrosi- 

 phum type. Maine collection numbers 59-05, 75-14. 



Macrosiphum soeanifgui Ashmead? 



(Figure 90, A-D. Figure 96, A.) 

 This species has not yet received experimental tests as to its 

 summer host. However, the strongly marked, clear cut, though 

 slender, venation ; the antennal characters ; the beak length ; 

 the pink and green color varieties ; the cauda and the cornicles ; 

 all are identical for this widespread species on the rose and 

 Macrosiphum solanifolii Ashmead as found on the potato ini 

 summer. It seems so unlikely that two species could show 

 such a complete resemblance that I am listing this species as 

 solanifolii with a question mark, until the matter be given a 

 conclusive experimental test. It is our most common species 

 on Japanese rose bushes on the campus, 



Macrosiphum dirhodum (Walker.) 

 (Figure 92, A-C. Figure 96, E.) 

 An aphid on Japanese rose on the campus at Orono with 

 the preceding species appears to be dirhodum as given by 



