Mayfly	Stonefly
Three Tails	Two Tails
Gills on sides of abdomen	No gills on abdomen
One set of wing pads	Two sets of wing pads
Legs stretched to the sides	Legs stretched to the sides
Six legs	Six legs

Caddisfly

Two brushy tails, with hooks (usually)

If have gills, gills are underneath abdomen

No wing pads

Legs held in front of body

Six legs

Other notes: Lots of variation: some will be in cases, some with be fat and fleshy, some thin. Most common one is pictured above. It is a free-living caddisfly (no case) and will have three hardened plates.

Midge Fly	Black Fly
Black Fly	No tails - have a suction pad instead
No gills	No gills
No wing pads	No wing pads
Proleg held under body	Proleg held under body
One proleg	One proleg
Long, thin body - does not thicken at end	Body thickens into a rounded abdomen
Head clearly visible - no projections from head	Head has mouth brush
Tend to "convulse" when moving	Tend to attach to surface

Crane Fly

No tails - fingerlike projections instead

No gills

No wing pads

No legs

Thick, catterpillar-like body

Body often semi-transparent

For drawing, see #16 on your bug ID sheet

Beetle Larvae

No tails - but gills often pulse in and out

Gills are sometimes found on end

No wing pads

Legs held in front of body usually

Six legs

Notes: Body is hardened and armored looking. Lots of variation