THE CANADIAN ENTOMOLOGIST. 63 



noticeable on the outer margins, but are moderately produced on the inner 

 margins, where they are somewhat swollen, as in Myzus. The first joint 

 of the antenna is slightly gibbous, also reminding one of the genus Myzus. 

 Wing venation normal, stigma dusky-brown, stigmal nerve strongly curved, 

 the middle ocellus rather prominent, the lateral tubercles of the prothorax 

 were slender or wanting, and the cauda very small, almost obsolete. The 

 cornicles are shaped like an Indian club, with the greatest diameter a little 

 beyond the middle and with the enlargement somewhat greater upon the 

 inner side of the cornicles. The greatest diameter is more than twice the 

 diameter at the proximal end. Beak short, barely attaining the second 

 coxse. 



Apterous Viviparous Female. — (Plate 3, fig. 2.) Taken along with the alate 

 form. 



Length of body and of antenna, 1.9 mm. Joints of antenna: III 

 .46, IV ,34, V .29, VI .13, VII .50 mm. Length of cornicles, .29 mm. ; 

 shape of cornicles as in the winged form. The cauda is very short and 

 pointed, black in colour, and does not exceed the tarsi in length. The 

 colours are as in the alate form, except that the body is not highly polished, 

 and the femora are not as black. Antennal tubercles rather large and 

 strongly gibbous on the inner sides, as are the first joints of the antennae. 

 Except for the cornicles, the head characters of this insect would cause it 

 to be classified as a Myzus. The body has many capitate hairs, which 

 are most abundant about the head, the terminal segments of the abdomen, 

 the legs and the proximal joints of the antennae. The vertex is strongly 

 produced, almost tuberculate between the antennas. 



No other food-plant than blue grass has been found for this species. 



Rhopalosiphu77i ?iervatum, n. sp. — Described from specimens taken on 

 wild rose leaves and tender stems, in Fort Collins, July 3, 1907. A 

 light-green louse of medium size and with conspicuous black nerv- 

 ures in the wings, common upon wild and cultivated roses throughout 

 the summer and fall. 



Alate Viviparous Female. — Pale green in colour, with light yellowish- 

 brown mesothoracic lobes above, dark red eyes, wings with heavy dark- 

 brown venation, antennae black, except joints i and 2 and proximal end 

 of 3rd ; tarsi and distal ends of tibi^ black, tibiae and distal portions of 



