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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1916 edition. Excerpt: ...while in Trichocera (Fig. 260), Dixa (Fig. 262), Sciara (Fig. 267), Bittacomorpha, Chi-ronomus (Fig. 270), Lonchoptera (Fig. 280), Scenopinus (Fig. 282), and the male of Psorophora (Fig. 266) they are greatly reduced. In Bibio (Fig. 264) and Geranomyia (Fig. 382) they are mere rudiments. They are wanting in Ehabdophaga (Fig. 268), Tipula (Fig. 277), ' Helobia (Fig. 385), Aphiochaeta (Fig. 278), Pipunculus (Fig. 279), Platypeza (Fig. 272), and Dolichopus (Fig. 284). The development of the maxillae of the genera possessing a ptilinum will now be considered. No cardines or laciniae are present in this group. The maxillary palpi are one-segmented and are present in all forms except Conops (Fig. 305). The palpi interpreted here as maxillary palpi have been called labial palpi by some (e.g., Wesche, 1909). The stipites and galeae are present in all the species studied, and they undergo decided morphological changes. All connection or association between the maxillae and the imaginations of the posterior arms of the tentorium has been lost. This loss is even more pronounced than in the Brachycera, since in all but a few species figured the maxillae are far removed from the head and situated near the distal end of the well-developed basiproboscis. This migration of the maxillae in the Cyclorrhapha has not altered their generalized position between the labrum-epipharynx and the labium. The stipites of genera having a ptilinum show all stages of ingrowth from a turned-in free edge or end (st-e), to forms in which it is entirely entad of the membrane of the basiproboscis, as in Musca. Eristalis (Fig. 286), Eulonchus (Fig. 284a), and Exoprosopa (Fig. 285) are the only forms without a ptilinum which show an ental growth of the stipites. These genera make a...

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