. Bulletin of the British Museum (Natural History). lUtll. By. Mhs. Hat. Hist. (Zool.) 23, 10 PLATE 16. 91 (in I) CERATOPHYLLUS STYX ROTHSCHILD, 1900 PALflEARCTlC ;HEADAND THORAX OF TWO CERATOPHYLLUS FROM CLIFF-SWALLOWS. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)

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