. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. 48 BEE FLIES OF THE WORLD. Text-Figure 9.—Mouthparts of adult bee flies of Exofrosopa sp. Explanation: 1, labrum, with labellum at apex; 2, mandible; 3, labrum-eplpharynx; 4, maxilla; S, maxillary palpus. may be absent; it is bare, jiubescent, or scaled. The tentorial fissure lies outside the oragenal cup and is often knife-thin, or it may constitute a more con- spicous fissure. Medially it encloses the clypeal space. The proboscis of the bee fly varies from stout and short, as in the Anthracinae and Lomati
. Bee flies of the world: the genera of the family Bombyliidae. Bombyliidae; Parasites. 48 BEE FLIES OF THE WORLD. Text-Figure 9.—Mouthparts of adult bee flies of Exofrosopa sp. Explanation: 1, labrum, with labellum at apex; 2, mandible; 3, labrum-eplpharynx; 4, maxilla; S, maxillary palpus. may be absent; it is bare, jiubescent, or scaled. The tentorial fissure lies outside the oragenal cup and is often knife-thin, or it may constitute a more con- spicous fissure. Medially it encloses the clypeal space. The proboscis of the bee fly varies from stout and short, as in the Anthracinae and Lomatiini, or even absent (Villoestrini) to very long and slender as in Bomhylius Linne and Phthiria Meigen; it is sometimes 4 times as long as the head. It is entirely absent in a few bee flies. According to Dimmock (1881) and Peter- son (1916), it is composed of 5 parts. At rest the hypo- pharynx lies within a groove on the dorsal aspect of the labium and is covered by the labrum (labrum-epipharynx) Beneath and at either side are to be found the maxillae, wliich are very fine and slender, shorter than the other parts; all of these may be disclosed if the mouthparts are teased apart with a very fine-pointed needle or insect pin, the maxillae being the most troublesome to sepa- rate. The maxillary palpi lie at the base on each side and consist usually of 2 segments; there may, occasion- ally however be 3 segments, sometimes only 1, and the palpus is fused and semivestigial in Comptosia Mac- quart ; the apical segment may be somewhat dilated and clavate, one or both segments may be covered with prominent hairs or scales; the trend is toward reduc- tion in number of segments. Besides tlie long, slender type of proboscis seen in Phthiriinae and most Bombyliinae there is the shorter, stouter type with the more or less expanded, almost muscoid-like labellum seen in Anthracinae which flies, when they feed at all, probably utilize pollen; Bezzi (1924) speculates upon the possible use of t
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Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectparasites
