Appearance
Adult ''H. tredecimpunctata'' have domed backs, mainly oval, often shiny with short legs and antennae. They have two wing covers. They are usually red to orange in color. This species has thirteen dark or black spots. The larvae are slightly flattened and covered with miniature spines. Very small eggs are laid in groups of 10–50 on the undersides of leaves.
Behavior
It feeds on ''Aphis farinosa'' and occurs on grasses and sedges associated with ''Sipha glyceriae'' and on aphids associated with Gramineae, Umbelliferae, and some other plants It also feeds on Erysiphales on reeds, before the emergence of aphids It has also found on cane, rotten hay, detritus, and under peeled-off bark.
Habitat
It is a stenotypic species most associated with wet meadows, lakesides, flood plains and river deltas, marshes, and in marshes and marshy alder thickets,carr and bodden on ''Carex'', ''Sparganium'', ''Phragmites'', and on Salix''References:
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