Numbers
1,930 species in 223 genera in United States and Canada
(1)Size
adult body length 2-10 mm
Identification
No ocelli.
Other defining characteristics include a crease (the cuneus) about two-thirds of the way down the front wing (the main defining characteristic), usually long, thin antennae (Lygaeids and Coreids usually have shorter, thicker antennae), and slender, delicate legs [this list paraphrased from a comment by Eric Eaton].
Food
Some members of the family are plant feeders; others are predatory.
See Also
Scentless Plant Bugs (family Rhopalidae) have ocelli and lack a cuneus
Internet References
pinned adult images of one or more species in each of 49 genera (Insects of Cedar Creek, U. of Minnesota)
Plant Bug Planetary Biodiversity Inventory home page (American Museum of Natural History)
list of North American species and genera, split into two alphabetized sections:
A-M,
N-Z (nearctica.com)