. Synopsis of the North American Syrphidae [microform]. Syrphidae; Diptera; Syrphidés; Diptères. SYNOPSIS OF NORTH AMERICAN SYRPUIDJE. 271 f tt plain, paper, in aper wet- t I would II g eleven lu species nl peculi- hey shall Very few they offer arvoD live or wholly hey serve UthOUNOH, be at the jes, when )n leaves, les toiij^h r families distinctly >lly want- utwardly ;ed fleshy ojectious feet. At ate tube, t, almost segment; !omposed of a tele- ly of the upal con- , to form and of a ' species, eriod the I sect and le in the ther Cy- le in this is trap or 1 datable. This function is that of
. Synopsis of the North American Syrphidae [microform]. Syrphidae; Diptera; Syrphidés; Diptères. SYNOPSIS OF NORTH AMERICAN SYRPUIDJE. 271 f tt plain, paper, in aper wet- t I would II g eleven lu species nl peculi- hey shall Very few they offer arvoD live or wholly hey serve UthOUNOH, be at the jes, when )n leaves, les toiij^h r families distinctly >lly want- utwardly ;ed fleshy ojectious feet. At ate tube, t, almost segment; !omposed of a tele- ly of the upal con- , to form and of a ' species, eriod the I sect and le in the ther Cy- le in this is trap or 1 datable. This function is that of the inflatable face, and hence it is, this part of the Syrphid anatomy is one of the very best for the furnishing of struct- ural characters in the a<lult fly. So iar, the larvie have furnisheil evidence of only two principal groups in the family. In the one (Kriatalinw) the larvo) have no mouth hookartH (£'r»«<a/i«, Mallotay Volucella, Uelophilvs, Pocota, Xylota^ Orthoneura); in the other the larvee are provided with well developed mouth-hooklets (Syrphus, Chi- losia, Doro», liaccha, Memdon, antl others). This division coincides fairly well with that based upon adult characters, but a classification drawn from the earlier chara(!terH can rarely supersede tluit founded upon the mature ones, though it may materially modify it. Certainly Orthoneura cannot be placed among the Eristalina, or Mcrodon among tlie Syrphimt without doing violence to most important and real relation- ships. Uraiier thinks that the larva;, when they are more studied, will furnish more natural groups in the .Syrphidte, but I do not agree with him, at least to any more than a limited extent. The perfect insect is the most complex, and must otter a greater number and more diverse characters than the simpler stages can present. The use which larval characters subserve the individual or species must first be ascertained before we can learn their true value. It is not at all probable that the poss
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