Some species are normally phytophagous, and the vast majority, at any rate, appear to be capable of continuing to exist and reproducing their kind upon a purely vegetarian diet.
Lastly, as regards the phytophagous forms, there can be no doubt that the destruction of grass-lands by "leatherjackets" (the larvae of crane-flies, or daddy-long-legs, - Tipula oleracea and T.
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.
They are exclusively phytophagous.
phytophagous insects are abundant and cause obvious damage.