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Show 250 I INSECT .A. . b d • and the a1 u 1 r e very large and cover-eli ned on each stde of the ~ Y' 11 and globular, the thorax very · the halteres; the head lS sma . d rounded, or almost mg d ves1cular an · · high or gibbous, the ab omen roximated, and the probosc1s 1s c Ubical·' the antennre are clos. ely app directed backwards or want1Dg. . rolonged backwards form two Those which have the proboscis p subgenera. In the first, CYRTUS, Lat. d the antennre are very small and Or Cyrtus properly so call~ ' t minal seta. In the second, or conSl.S t 0 f two J. oints, the last Wlth a er ' p ANOPS, Lam • The antertnre are longer t h. an the head , almost cylindrical, tri· d . 1 ut a termmal seta. articulated an wlt lO . h oboscis is not remarkable. In the remaining Cyrtl t e pr AsToMELLA, Dufour. - omposed of three joints, the last Distinguished by the antcnnred c ressed button without a seta. of which forms an elongated an comp . HENOPs, Illig.-Ogcodes, Lat. The antennre very small, biarticulated, W·l t h a terminal seta and inserted in front of the head. AoROOERA, Meig. Similar antennre inserted on the anterior part of the head( l ). BoMBYLius, Lin.-Bombyliers, Lat. . tall on each side of the body, Where the wings are extended horizon y . 1 . gher than the head, d The thorax ts u and the halteres are expose . 1 ely approximated, and or gibbous as in Cyrtus; the antennre are c os 263 xxii 3. Lat., Gen. Crust. (1) See Lam., Ann. du Mus. d'Hist. Nat., III, P· ·Ucles'o 'codes and Parwp&; et Insect., IV, P· 315, et seq.; the Ency;.t:Me:;~d~~:~he Diet~ Class. d'Hist. Nat. Meigen and Fabricius. For the genus a om DIPTERA. 251 the abdomen is triangular or conical; the proboscis is directed fot·wards. Their antennre always consist of three joints, the last elongated, almost fusiform and compressed, truncated or obtuse, usually terminated by a very short stilet, and never by an elongated seta. The palpi are small, slender and filiform. The proboscis is genet·ally very long and most slender at the extremity. Their legs are long and attenuated. They fly with great velocity, hover over flowers without a1ighting on them, introduce their trunk into their calyx to obtain their nectar, and produce a sharp humming sound. I suspect that their larvre are parasitical as \Veil as those of the following genus. In some the proboscis is evidently longer than the head, very slender and tape1·s to a point. 'foxoPHORA, Meig. Removed from all the others by the antennre, which are as long as the head and thorax, projecting, filiform, and terminating in a point, and of waich the first joint is much longer than the rest. The body is elongated( I). Of those in which the antennre are much shorter, the XEsTOMYzA, Wied • Approximates to Toxophora in the length of the first joint of those organs, which is considerably greater than that of the others; it is almost fusiform, as well as the third or last(2). APATOMYzA, Wied. Is another subgenus in which the first joint of the antennre is also very long; but here that joint is cy1indrica1(3). In the foiJowing subgenera of the same division, or of those whose proboscis is long and setaceous, or filiform, the last is the longest. Sometimes the two first joints of the antennre are short and almost of equal length. (1) See Meigen; his T. maculatus had been described and figured by Villers, in his Entom.' d'Europ., liT, x, 31. .IJ.rilua fasciculatus. See also Wied., Dipt. Exot. (2) Wied., Dipt., Exot., 153, I, 11. (3) ld., Ibid., nr. I have never seen a species of this genus. |