A fly Parasitic on the Swallow

01 January 1935
Comments Main paper the enquiry, under the auspices of the British Trust for Ornithology, into the size of broods of the Swallow (Hirundo r. rustica), it has been found that the larvae of one of the blue-bottle flies, Protocalliphora caerulea R.-D. (also known as Phormia sor...
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