Brown sowthistle aphid
Uroleucon sonchi

The apterae are medium-sized to rather large aphids which may be shiny red, reddish brown or blackish brown. The antennal tubercles are well developed, smooth with diverging sides. The antennae are about as long as the body. Dorsal abdominal hairs are not capitate and are placed on scleroites which are normally dark. Antesiphuncular sclerites may be present or absent; postsiphuncular scleroites are normally present. The siphunculi are black and long with a zone of polygonal reticulation occupying the subapical 0.15-0.4 of their length. The cauda is yellow, dusky or black, finger shaped, long and rather pointed.