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Show INSECTA. 306 . ted by a narrow and elongated generally approx'lm ated' and te.rmma l h f 1 The abdomen, at east t at o palette, with the seta always pt o~.e.drical terminated by a club in the male, is elongated, almost cy m ' some, and a stilet in others. f furnished with hairs or musta- In these, the sides of the ace are chios. externally but four segments. The Here the abdomen presents seta of ~he antennre is simple. DIAI.YTA, Meig.(l) There, it offers five rings at least. CoRDYLURA, Fall · Meig.-Ocyptera, Fab. . extend but little, or not all, beyond the abdo- Where the wmgs . 1 (2) men, w h1. c1 1 terminates in a club m the ma es . Lat Meig.-Musca, Lin. Fab. SoATOPHAGA, · . h longer and the abdomen is not in- Where the wmgs are muc . . ' sterior extremity m either sex. fl. a ted at the po . • Musca stercorar·ia, L.; Rea urn.' Insect., IV, S. stercorana, '1 d of a greyish-yellow; front russet; a xxviii. Densely pl o~e an t f the palette bearded. Very · ton the wmgs; sea 0 brown pom h f man particularly, where the n on frecal matters, t ose o f b commo . h' h are retained on the sur ace y female depostts her eggs w 1~ • two appendages resembling ~tttle wmgs(3). These are destitute of mustachlOs. . . . ar The body is always long, narrow, cyhndncal, and hne • LoxooERA, Lat. Fab. Meig. Where the antennre are much longer than the head. ocerre resemble little Ichneumons( 4). (1) see Meigen. (2) Idem. 358 (3) Meig., and Lat., Gener. Crust. et Insect., lV, • (4) Lat., Fab., Meigen. The Lox- DIPTERA. 307 CHYLIZA, Fall. Meig. Where they are rather shorter than the head, with the seta thick, and in the form of a stilet( 1 ). The antennre of the others are always much shorter than the head, and usually projecting and distant; the palette, never much longer than it is wide, is sometimes almost ovoid, or bordering on an oval, and sometimes nearly globular. Some, in which the seta of the antennre is usually pilose, have the narrow and elongated body of the preceding ones; the abdoJllen of several also terminates in a point or stilet. Of these Muscides, some have a naked face, and the palette of their antennre more or less ovoid or oval. Such are the two following subgenera: LrssA, Meig. Where the top of the head presents a prominence, and the almost linear abdomen is not terminated by an articulated stilet(2). PsrLOMYIA, Lat.-Psila, Meig. Where the body is proportionally less elongated and cylindrical, and the abdomen of the females terminates in an articulated stilet(3). To this subgenus may be united the Geomyzfl3 of Fallen( 4). The Tetanura and Tanypeza of M. Meigen appear to approach the preceding subgenera. In both, however, the legs seem to be proportionally longer and more slender. The abdomen of the Tetanurre is obtuse and thickened at the end. The first exterior nervure of the wings is simple, and does not produce a stigmatiform cell; the exterior terminal cells are distant( 5). The abdomen of the female Tanypeza is terminated by a point or (1) Meigen. (2) Meigen. (3) See Meigen. I have changed the name of Psila, because it too nearly resembles that already given to a genus of the Hemiptera. (4) Fall., Dipt. (5) Meigen. |