Head: Light reddish-brown to yellowish. No dark marks.
Antenna: Yellowish-white. Tips slightly darker.
Thorax: Light reddish-brown with a few light spots.
Wings: Light with dark flecks, darker at base; almost checkered along upper (inside) border. Two thin diagonal dark lines, one mid-wing and one nearer wing tip which has another line jutting off at a right angle, sometimes touching the first diagonal line. Veins pale yellowish-brown with dark flecks.
Legs: Pale yellowish, toes darker. Front and mid shins (tibiae) may have one or two faint dark bands on each leg.
Abdomen: Dark reddish-brown.
Similar Species: Micromus subanticus has longer, narrower wings and a dark mark on each side of the face. Micromus angulatus has three diagonal stripes, two with right angles off them.
Size: 6 to 9 mm to wing tip.
Flight Time: March and April, again in July to November.
Habitat: Forest edges, both deciduous and conifer; meadows.
Food: Aphids and other soft-bodied insects.
Life Cycle: Females can lay up to approximately 60 eggs per day. . Larvae have 3 instars. Larva do not cover themselves with debris. Adults live about 3 weeks. Assumed that adults over-winter. 4 to 5 generations per year.
Parasites: Ichneumon Wasp Charitopes mellicornis
Comments: Essex County – Point Pelee National Park, Erie Islands and Ojibway Prairies. Kent County – Rondeau Provincial Park. LaSage in Biodiversity Data Journal, 2013, Vol. 1 believes M. posticus is rare. Only 23 specimens collected in Ontario in the last 100 years.
For information on synonyms, references and type specimens see next page