Hence the resemblances belonging to the first category are commonly termed "Batesian mimicry," and those belonging to the second category " Mullerian mimicry," or more properly " Mullerian resemblance."
Over and over again extended knowledge on this point and inferences drawn from other facts have shown the certainty or probability of examples of mimicry being in reality " Mullerian," which were previously accepted without question as " Batesian."
But if it be discovered, as is possible, that the drone-fly is also inedible, the mimicry must be ascribed to the Mullerian category, and the reason for it becomes less evident.
This phenomenon is termed " aggressive mimicry " as opposed to the Batesian and Mullerian phenomena, which are termed " protective mimicry."
If this be the case the two species probably furnish an instance of true Mullerian mimicry.
The Lepidoptera furnish more instances of mimicry, both Batesian and Mullerian, than any other order of insects.
In the majority of cases both model and mimic belong alike to the Lepidoptera, and it is often uncertain whether both are inedible (Mullerian mimicry) or whether inedibility is the attribute only of the model (Batesian mimicry).
The study of this intricate case is not yet completed and it is at present unknown whether it is an instance of Batesian or Mullerian mimicry.
The significance of this phenomenon, as already stated, was first explained by Fritz Milller; but although the term " Mullerian mimicry " has been assigned to this and similar instances, they are not strictly speaking cases of mimicry at all but of warning coloration.
Synaposemasy is Mullerian mimicry.
In other words the insects entering into the combination may furnish instances of Batesian and of Mullerian mimicry.
Since many of the insects of the order Hemiptera are distasteful, the mimicry of the bug (Megapetus) is in this case probably Mullerian or synaposematic; the grasshopper (Myrmecophana), on the other hand, is probably edible and the mimicry is Batesian or pseudaposematic. This is a simple case consisting of a small number of component species.
With the exception of the Asilid fly and perhaps some of the Longicorn and Phytophagous beetles, which are probably protected Batesian mimics, all the other species constituting the above-mentioned assemblage are, it is believed, Mullerian or synaposematic mimics.