August, '11] GILLETTE: APHIDIDE 381 



PLANT LOUSE NOTES, FAMILY APHIDIDiE 



(Concluded), Plate 16 



By C. P. Gillette 



Rhoyalosiyhum rhois Monell. — This species was taken on sumac 

 (Rhus sp.) on Belle-Isle, Detroit, and at Fort Lee, and was extremely 

 abundant on wild sumac about Georgetown, D. C. At the latter 

 place the sumacs had been so severely attacked that much of the foli- 

 age had the appearance of having been frosted, and many of the leaf- 

 lets had fallen. The third joint of the antenna has from five to eight 

 slightly raised sensoria in the specimens collected. The antenna and 

 cornicle of the summer winged form are shown in figures 1 and la. 



Rhopalosiphum capre(e Fab. — This species was taken at Amherst 

 and Webster, Mass., and at Fort Collins, Col. It has the willows 

 {Salix species) for its winter hosts and several species of UmbeUiferae 

 for its summer food plants. For illustrations and fuller notes on this 

 species and R. pastinacea see an article by the writer in the June, 1911, 

 number of the Journal. 



Amphorophora ruhi (Kalt.) 



Aphis ruhi, Kaltenbach, Walker. 

 Siphocorine ruhi, Koch. 

 Siphonophora ruhi, Buckton. 

 Amphorophcra ruhi,. Schouteden. 



The above seems to be the synonomy of this species. Examples 

 were taken by Mr. Bragg at Webster, Mass., on Ruhus occidentalis. 

 It was also taken on the same host plant at Fort Collins, Col., July 

 7-31, 1908. The hind legs are very long, the tibige being nearly as long 

 as antennal joints 3, 4, 5, and 6 together. For antenna and cornicle 

 of alate summer form see figures 2, 2a and 3. These specimens from 

 Massachusetts agree with specimens of this species from Ruhus fruit- 

 cosus at Southwater, Sussex, England, July 2, 1909, collected and sent 

 to me by Prof. T. D. A. Cockerell, except that the specimens from 

 Europe are a little smaller. 



A very similar species taken by IVIr. Bragg at Lawrence, Kans., differs 

 by having cornicles decidedly shorter and having joint 4 of the antenna 

 in the alate viviparce well set with sensoria. 



Myzus cerasi Fab. — ^Taken at Portland, Mich., Rochester and 

 Albany, N. Y., and Portland, Hood River and Corvallis, Ore., on Pru- 

 nus cerasus; at Webster, Mass., on P. serotina, and on Prunus eniar- 

 ginata, var. 7noUis, at Portland, Ore. This species is abundant on the 

 eastern slope, and occurs in a few locahties only on the western slope 



