. An account of British flies (Diptera). Diptera -- Great Britain. THE lOI Antennae io-i6-jointed, porrect and simple; pronotum small; scutum of meso-thorax undivided : wings and halteres present except in EpidapHs ; the discal areolet wanting, veins few ; abdomen, seven segments, rarely eight; legs formed for leaping ; coxae large ; tips of tibife armed with large spurs ; bristly hairs are developed on the legs, which are not, however, macrochreta;.*. Fig. i8.—Bolct'ma duhia. Classification of Mycetopiiiiidce, The family is now divided into eight sub-families, which are given
. An account of British flies (Diptera). Diptera -- Great Britain. THE lOI Antennae io-i6-jointed, porrect and simple; pronotum small; scutum of meso-thorax undivided : wings and halteres present except in EpidapHs ; the discal areolet wanting, veins few ; abdomen, seven segments, rarely eight; legs formed for leaping ; coxae large ; tips of tibife armed with large spurs ; bristly hairs are developed on the legs, which are not, however, macrochreta;.*. Fig. i8.—Bolct'ma duhia. Classification of Mycetopiiiiidce, The family is now divided into eight sub-families, which are given below in tabular form : A. Middle transverse vein elongated. a. Brachial vein wanting. •5. Brachial vein present. I. Antennae not very long. a. Brachial vein long. aa. Brachial vein short. II Antennae very long. b. Antenna setiform. bb. Antennae filiform. B. Middle transverse vein not elongated. a. Brachial vein present, legs long. ,5. Brachial vein wanting. * The Nematocera are characterized by the total absence of macrochseti^. The stouter hairs on the thorax and scutellum of Ciilex and on the legs of the Myceto- pliilidii:, Osten-Sacken tells us, " can hardly be considered as such" (An Essay of Comp. ChKtotaxy, Tr. Ent. Soc, Load., 1884, Pt. 4). Continuing, he tells us " The Culicidre, Chironomidce and Tipulidae are distinguished by the development and sexual differentiation of the antennce, which are in this case very probably the organs of orientation. The same conclusion may be arrived at with regard to the Cecidomyidae and ; The difference, however, between the bristly hairs on the legs of " Fungus Gnats " and the typical macrochsetce of the Musiidce seems to be very slight. On the legs of certain Myietophilida and Cecidoniyiada: I have found curious club-shaped hairs ; what their function is I do not know. Mr. Dale thinks they are probably to assist them in leaping. I. Diadocidinoi. 2. 3. CcroplatincJ:. 4. Bol
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherlondo, bookyear1892
