. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES AND MELANDER: CLASSIFICATION OF INSECTS 365 If the posterior spiracles are located on a common chitin plate they are contiguous to each other 42 42. Posterior spiracles close together at the end of a tracheal tube of greater or less length, which is sometimes chitinized and some- times greatly extensile; mouthparts various, absent in "rat- tail " larvse (Fig. 725), developed in the species living in wood, and in the " Aphis-lions " (Syrphus, etc.) the mouthparts are. 722. Please note that the

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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. BRUES AND MELANDER: CLASSIFICATION OF INSECTS 365 If the posterior spiracles are located on a common chitin plate they are contiguous to each other 42 42. Posterior spiracles close together at the end of a tracheal tube of greater or less length, which is sometimes chitinized and some- times greatly extensile; mouthparts various, absent in "rat- tail " larvse (Fig. 725), developed in the species living in wood, and in the " Aphis-lions " (Syrphus, etc.) the mouthparts are. 722. 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 Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum

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Keywords: ., bookauthorharvarduniversity, bookcentury1900, booksubjectzoology