THE CANADIAN ENTOMOLOGIST. 391 



la nearly every colony I fiiid a {l:w very dark green oviparous 

 fennles with reddish head and j)rolhorax. I take them to be a colour 

 variation only. 

 Apteroiis Male (Phte ii, fig. 7). 



From specimens taken Oct. 26, '07. 



Oenera! colour sordid yellowish-brown or greenish-rufous, with a 

 pronounced tinge of rufous upon head and thorax, but without the bright 

 red of the females. Antennae, eyes, distal halves of femora and tibiae, 

 tarsi, cornicles, beak and anal plates black or bl ickish. Length of body, 

 1.75 mm.; length of antenna, 1.60 mm. Joints of antenna about as 

 follows: III .36, IV .30, V .26, VI .11, Vn ,40 mm. Cornicles 

 cylindrical, .17 mm. in length Cauda very short, blunt and black. 

 Third joint of antenna with about 20 small circular sensoria ; joint 4 with 

 about six, and j )int 5 with about four. Joints with a ^<t\\ short stout setse 

 on each. Beak long, easily attaining hind coxee. 



This is tlie only phnt louse that I have found having two sets of 

 mal:s. Those appearing in July did U'.it continue long, and^ being winged, 

 had the semblance of very small females. No eggs were seen until after 

 the appearance of the wingless fall brood of males during the latter part of 

 September and October. This louse is always well attended by ants, and 

 I have been unable to find eggs u[)on the food-plints in the fit Id, but 

 when the lice are brought into the laboratory and kept for a few days upon 

 thisile, eg2s are laid in considerable numbers. They are light green in 

 colour at first, but become polished black in a itw days. I cannot help 

 wondering if the ants carry away the egg.s. 



On May iS I found what seemed to be stem mothers of this species 

 upon Carduits sp. at Akron, Colorado, and about each parent insect were 

 a few light red young of different ages, and the thistles have been 

 continually infested wiih the lice to the present writing, Oct. 20. We 

 have not found this species infesting any other jilant. 

 Aphis carbocolor, n. sp. 



A black I )use frtmi stems and leaves of yellow dock, Rumex, sp. 



Alate Viviparous Female, from Fort Collins, June 26, '07. 



Bl.ick throughout, except for the greater part of the tibiae and anterior 

 femora, the proximal ends of tlie middle and posterior femora, and the 

 long basal segment of the beak. The dorsal portion of the body is 

 polished. 



