THE CANADIAN ENTOMOLOGIST. 165 



NEW AND LITTLE KNOWN SPECIES OF APHIDID^. 



BY JOHN J. DAVIS, BUREAU OF ENTOMOLOGY, WASHINGTON, D. C. 



(Continued from Page 134.) 



Rhopalosiphum howardii (Wilson). 



This species has been collected by us from widely separated 

 localities, and in all cases we have found it on the flower heads of 

 the host plants. Mr. H. F. Wilson first described this species as 

 Amphorophora howardii from the heads of Panicularia nervaia at 

 Ratesburg. Mr. Geo. G. Ainslie found it on timothy heads, June 

 28, 1908, at Biltmore, N.C., Mr. R. A. Vickery collected it on Elymus 

 virginicus, June 19, 1909, at Salisbury, N.C., Mr. C. N. Ainslie found 

 it on heads of Elymus, August 11, 1911, at Salt Lake City, Utah; 

 and the writer has collected it on the following plants and at the 

 following localities: La Fayette, Ind., on heads of Elymus cana- 

 densis, orchard grass (Dactylis glomerata), and wheat, from July to 

 October, inclusive; at Bedford, Ind., on Elymus canadensis and E. 

 striatals, August 13, 1911; at Urbana, 111., on E. canadensis, July 27, 

 1912; Lancaster, Wis., on E. canadensis, and cultivated barley, 

 July 11, 1912; at Farley, Iowa, on E. canadensis, August 30, 1912; 

 at Winner and Elk Point, S. Dak., on E. canadensis, September 2 

 and 5, respectively, 1912; and at Reaver Dam, Wis., on E. cana- 

 densis, September 11, 1912. During August, September, and Oc- 

 tober, the winged males were not uncommon, and these took flight 

 within a few days after becoming winged. Although careful search 

 was made, we were unable to find oviparous females. It appears 

 from our present meagre data that the winged males and winged 

 viviparous females migrate to an unknown host in the fall of the 

 year, where the oviparous females are produced, as is also probably 

 the case with Myzus lycopersici (Clarke). 



Wingless viviparous females. 

 (PI. VII, fig. 34.) 



Entire body nearest to cadmium yellow as given in Smith's 

 colour chart, but not so bright, the colour varying to brownish cad- 

 mium yellow; head and thorax paler, with a slight greenish tint. 

 Antenna,* blackish, excepting segments I, II, and entire base of 

 III, which are dusky greenish (in recently matured individuals III, 

 basal three-fourths of IV, and extreme base of V are brownish) ; 



May, 1914 



