THE CANADIAN ENTOMOLOGIST. 61 



NEW SPECIES OF COLORADO APHIDID.4^:, WITH NOTES 



UPON THEIR LIFE-HABITS. 



BY C. P. GILLETTE, FORT COLLINS, COLORADO. 

 (Continued from page 20.) 

 During October, 1906, Mr. L. C. Bragg discovered iipon the lawn 

 grass {Poa pratensis) upon the campus of the Colorado Agricultural Col- 

 lege, a black Rhopalosiphum that seems to be new. It continued upon 

 the grass through the winter, and in warm situations, as upon the south 

 side of buildings, it became extremely abundant in the spring. Through 

 the summer and early fall the louse was not noticed or specially sought 

 for, but this fall (1907) it is again abundant, especially next to the walls of 



buildings and along the border of walks. It accumulates chiefly upon the 

 tender new leaves ard upon the bases of the leaves. About my house 



during the early part of November and first ten days of December, the 

 date of this writing, young and apterous females have been very abundant, 

 and winged viviparous females not scarce. No sexual forms or eggs have 

 been found. In places the blue grass has been killed during late fall and 

 early winter by this louse. 



Rhopalosiphum poce, n. sp. — Winged Viviparous Female. Plate 3, figs. 



I and 3. Specimens taken on lawn grass Poa pratensis, at Fort 



Collins, November 17, 1907. 

 General colour, apparently a uniform black, but really a very dark 

 dusky-brown or brownish-black. The base of the beak and the proximal 

 ends of the femora are the only light parts. The tibiae are lighter in 

 colour than the femora, and are a dusky brown. The cornicles are lighter 

 than the other portions of the body, and are light to dark dusky-brown. 

 Thorax and abdomen highly polished above. 



Length 1.80 mm.; length of antenna, 2.40 mm ; cornicles, .33 mm.; 

 wing, 3.40 mm. Joints of antenna : III .70, IV .51, V .37, VI .14, 

 VII .65 mm. While the joints vary some in length, they do not vary much 

 from the above measurements. Third joint of antenna with many strongly 

 tuberculate sensoria both above and beneath ; joint four with about 24 

 similar sensoria (see fig. 2), and joint five with about three near its proxi- 

 mal end. The antenna is upon moderate tubercles, which are hardly 



February, 1908. 



