— hornet, [2]

Mandibles, [127], [129]

Mason bee, [55]

Maxillæ, [75], [127], [134]

Mayflies, [128]

Melecta armata, [61]

— luctuosa, [62]

Mentum, [74]

Metœcus paradoxus, [38]

Mimicking flies, [94]