Where, as for instance in the case of the Olive Quill or the Iron-blu dun, a determined effort is made to reproduce the natural insect in colour, shape and attitude, the artificial fly may be called an imitation. It is of little consequence whether the effect be got by reflected or transmitted light.
A less ambitous effort may be called a representation, while a pattern so sketchy as just to give the effect of a stumbled specimen may be called a suggestion.