. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. BOMBYLIIDAE 65 the hollowing of the occiput is the primary divisionary character. It began in the Cylleniinae, and hence I place these flies as the first subfamily within the Tomophthalmae (section [2] ). With it and accompany- ing it there follows a profound anterior recession of the eye (as begun in Tomomyza Wiedemann and ending in Oestranthrax Bezzi, etc.), the consequence of which is the greatly thickened occiput. The end result is a short, occipital fringe around the rim of the cup, a long cervix, comp
. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. BOMBYLIIDAE 65 the hollowing of the occiput is the primary divisionary character. It began in the Cylleniinae, and hence I place these flies as the first subfamily within the Tomophthalmae (section [2] ). With it and accompany- ing it there follows a profound anterior recession of the eye (as begun in Tomomyza Wiedemann and ending in Oestranthrax Bezzi, etc.), the consequence of which is the greatly thickened occiput. The end result is a short, occipital fringe around the rim of the cup, a long cervix, complete freedom of head movement, generally shortened proboscis, more and more muscoidlike label- lum, change of flower preference, and perhaps a greater consumption of pollen. The more time and study I expend upon this family the more apparent it seems to me that many characters represent a situation of what must be thought of as duplication or as parallel development or convergence, with the reappearance of certain characteristics inde- pendently in different parts of the family. These I shall indicate below. Cellular content of wings: fi-om a condition where there are commonly as many as 4, and sometimes even. OCCIPUT EXCAVATED. ~-'^ OCCIPUT 610BULATE Text-Figure 18.—A provisional phylogenetic chart of bee flies and the relationship of subfamilies and 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 Hull, Frank M. (Frank Montgomery), 1901-1982. Washington, Smithsonian Institution Press
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