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Show 246 INSECTA. In the two following subgenera the antenna:: are manifestly longer than the head, and frequently placed on a common pedicle; the stilet is elongated and of the same thickness as the antenna::, at the end of which it forms two joints, the second longest, almost cylindrical or ovoid, and terminating in an obtuse point. In CERATURGUS, Wied. The antenna:: are not implanted on a common tubercle, and their first joint is shorter than the second(l). In DrooTRIA, Meig. Fab. These organs are situated on a common peduncle, and their first joint is longer than the following one(2). There, the terminal stilet of the antenna:: is prolonged in the form of a seta. Those in which this seta is simple form the subgenus AsxLus proper. In Europe towards the close of summer we frequently find the .11. crabroniformis, L.; De Geer, Ins., VI, xiv, 3. It is about an inch long, and of an ochre-yellow; three first abdominal an· nuli of a velvet-black, the rest fulvous-yellow; wings russet. The metamorphosis of this species as well as that of the JJ.. forcipatus, Lin., has been carefully observed(s). Those, in which_the seta of the antenna:: is plumous, form the sub-genus (1) Ibid., Anal. Entom., pl. i, 5. (2) The same authors. (3) For the other species and these various subgenera, see Latreille, Meigen, Fabricius, Wiedemann and Macquart. I presumed that the genus Oyrtoma of Meigen should not be 'arranged with the Platypezinre, but with the Empides, according to the opinion of Fallen. M. Macquart has in fact lately referred them to the latter. This subgenus is distinguished from all those of this division, fur· nished like it with biarticulated antenna:, and in which the palpi are incumbent on the trunk, by the elongated and conical form of the last joint of the antenme, by the wings, and by the smallness of the palpi. For other details, sec Macquart'a work, Dipt. du nord de la France. DIPTERA. 2?i7 0MMATIU's, Illig. Wied.( 1) Sometimes the tarsi are termi . diate of which replaces th t nated by three hooks, the interme-e wo pellets. GoNYPus, Lat.-Lentogaster M . 'J' , e1g. The stilet terminates in a short seta almost linear, and the tars' . The abdomen is long and 1 are arcuated(2) I.n t1h e others, lflybotini ' Lat ., th e h ead ·I. S mor entire y occupied by the eves in th I . e rounded, almost ly n k d b . ' e rna es, and Its epi t f . a e ' or ut slightly pilose. The r . . s oma requent- Wings present fewer nervures tha th p obfoscis Is very short. The th · · n ose o the pre d' eir mner portion is destitute of th ce mg ones, and whose point rests upon the post . at complete triangular cell rudimental. eriOr margin, or at least it is merel ' s . y gate~mehdmes th~ last joint of the antennre is I ' an termmated by a very small stilet. arge, fusiform, elou- CEDALEA, Meig. Sometimes the last · · long seta(3). JOIDt is ovoid, short, or c onl. ca1 ' and with a HYBos, Meig. Fab.-Damalia' F a b• \Vhere the posterior thighs are large and . fi m ated(4). OcYDROMIA, Hoffim • M e1. g. Where they are of an ordm. ary size(s). ' (~) Wied., Dipt. Exot., 213. ( ) See the authors just quot d • (3) Idem. M. Macquart D' ; • genera in this divisio . , lp . du nord de la France, has est bli third J'oint of the tn. MrcRoPaon.A., similar to CEdalea 'tn th al shed two new an ennre but 'th e e ongaf f allied to Ocydromia b t , . WI an elongated stylet· and LE Ion o the inserted in the back ofu tJ:~~~i~~e ~t~let en~irely terminai, whilst :T:::~::t clo~el! (4) See the same works Jomt, a little heneath its extremity er It Is (5) Idem. · · |