. The Annals and magazine of natural history; zoology, botany, and geology. used on to the gular plate,while the former, instead of the latter, provides the attach-ment for the maxillary stipites. Ii/u/phus (fig. 2 a) presentsa very different structure : there is a well-marked medianorgan situated between the labella, which is regarded byKellogg ( Psjche/ vol, viii. p. 35()) as representing thefused glossfe ; a small narrow plate is inserted between thementum and the gular plate, on each side of which last isanother plate, which may, perhaps, be regarded as the cardoof the maxilla. A gular pla
. The Annals and magazine of natural history; zoology, botany, and geology. used on to the gular plate,while the former, instead of the latter, provides the attach-ment for the maxillary stipites. Ii/u/phus (fig. 2 a) presentsa very different structure : there is a well-marked medianorgan situated between the labella, which is regarded byKellogg ( Psjche/ vol, viii. p. 35()) as representing thefused glossfe ; a small narrow plate is inserted between thementum and the gular plate, on each side of which last isanother plate, which may, perhaps, be regarded as the cardoof the maxilla. A gular plate entirely comparable with that of occurs in Ptychoptera and in Trichocera, thoughit appears to be absent in DLva. A similar plate is to befound in at least some of the Brachyceea and in theMusciD^, where it is fused with the head-skeleton ; it hasbeen figured for Musca by Wesch^ (J. E. Micr. Soc. 1909,pi. iv.), who regards it as the mentum. Venation. The Rhyphid^ and Mycetophilid^ agree in having acosta which does not extend beyond the tip of the wing, but. ^■^z Cu^ An Wing of (a) Mycetohiapallipes, Mg., (5) Olhiogaster sackeni, Edw. differ widely in that the former have a three-branched mediaand a discal cell, whereas the latter never have more than atwo-branched media and no discal cell. At first sight it is not easy to connect these two types, butif in the wing of Rhyphus we suppress the third branch ofthe media, and with it the cross-vein forming the discal cell,a condition very much resembling that of Mycetohia is arrived Ann. & Mag. N. Hist. Ser. 8. Vol xvii. 8 114 Mr. F. W. Edwards 07i the at, and the following points of resemblance between the twogenera become more apparent: — (1) the radial sector forksbasally to the R-M cross-vein, or, in other words, the smallcross-vein is situated on the third longitudinal vein, insteado£ on the prsefurca; (2) the lower branch of the cubitus isdistinctly sinuous, the cell Oui having a convexity on thelower side t
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