DIPTERA. 623 



lltmerodrom'ia, Hoffm., has the two fnro cox;e very loni^:. 



S'icus, Latr. {Tacliydronua, Meig".), has llie lirst or second pair of thit^hs thickened. 

 Drapftis, Aleis;-, has the last joint of the antennae subj^lobose, and the proboscis scarcely exserted. 

 M. Macquart [as well as Mr. Haliday and Professor Zettcrstedt] have established several additional g"enera, 

 uhich it would occupy too much space to notice in detail. 



The other Tanystoraa of our first division have the hoily generally short, l)road, with the head 

 exactly applied to the thorax ; the \ving3 extended, and the ahdomen triangular. They have, in a 

 \vord, the appearance of Domestic Fhes. The prolioscis is often very long. 



Cyrtus, Latr. [Veaiculosa, Latr.], — 

 Intermediate between Empis and Bombylius, with the wings dellexed at each side of the body ; the 

 alulets very large, and covering the balancers ; the head small and globular ; the thorax very gibbose ; 

 the abdomen vesiculose, and the proboscis directed backwards, or wanting. 



Some have a proboscis directed backwards. 



PanopSy Lam., with antennae longer than the head, cylindric, and 3-jointed, without a terminal seta- 



t'lirtus proper, with antennce very small, 2-jointed, with a seta at the tip. 



The others have not an extraordinary proboscis. 



Astomclla, Duf., has the antennie 3-jointed, with the last joint formiiifi' a compressed, elongated knob, without 

 a seta. 



Jlcnops, IDig. {Or/codes, Latr.), has antenna; inserted before the eyes, small, and 2'jointed, with a terminal seta. 



Acrocera, Meig;., ditiersin having the antenna; inserted behind the eyes. 



Bombylius, Linn. {BomhyJiers, Latr.), — 

 ITas the wings extended horizontally on each side of the body, with the lialancers naked; the thorax 

 higher than the head, or gilibose, as in Cyrtus; the antennae close together, and the abdomen trian- 

 gnlar, or conical. The proboscis is porrected in front, and very long in many species. The antennae 

 are always 3-jointed, the last being elongated, compressed, fusiform, generally terminated by a very 

 short style, and never hy an elongated s'.'ta. The palpi are slender, fdiform ; the legs are long and 

 slender. These insects fly with wonderful rapidity, hovering over flowers without settling, and intro- 

 ducing their long proboscis in order to suck up the honey, and making a sharp buzzing noise. I suppose 

 that their larva?, like those of Anthrax, are parasites. 



Some have the proboscis evidently lon;j;er than the head, very slender, and pointe<l at the tip. 



Toxophoray Rleig., has the antenna; as long as the head and thorax, iilifui'm, pointed at the tij), and the body 

 elongated. 



Xc.tiomiiza^ Wied., has shorter antenna', but the first joint is elongated, and longer than tlie other joints, and 

 fusifo]-m, as is also the third. 



Apatonufza, Wied., has the first joint also very long, but cylindrical. In the subsequent subgenera tiie last 

 joint [of the antenna;] is the lon;<est, and sometimes the t'v^o basal joints of the antenu;e are short, and of nearly 

 equal length. 



Lasins, Wied., has the head nearly occupied in one sex by the eyes, and the last joint of the antennce very long, 

 nearly linear, compressed, and without a terminal style; the abdomen is voluminous; the proboscis occa- 

 sionally extends beneath and beyond the extremity of the body, which seems to connect this genus with [Cyrtus 

 or] the tribe of Vesiadosie. 



Usia, Latr., has the last joint of the antenna; ovoid, conic, oljtuse, or truncated at the tip, and terminated by a 

 style ; the palpi not apparent. [South of Europe, or Africa.] 



Phihiria, Meig., resembles Usia in the antenna, but with distinct palpi ; sometimes the second joint is evidently 

 shorter than the first ; the last is long, generally almost cylindric, and pointed at the tip. 



]iomh}/lius proper, has very distinct palpi, and the body is clothed with a thick woolly coating of hairs. B. majors 

 Linn., a very abundant species [in this country]. 



Gfro/i, Jleig., has the last joint of the antenna; longer, terminating like an awl, and the wings wanting- one of 

 the transverse nerves near the hind margin. 



Thlijysowyza, Wied., is allied to the preceding, and Phthiria ; and I presume that 



Amictiis, Wied., also approaches them. Both have the basal joint of the antennas longer than the second, and 

 cylindrical ; the wings of Amictus, however, diflTer from the preceding- subgenera. 



The other species have the proboscis not longer than the head, and thickened at the tip, and the basal joint of 

 the antenna; is the largest. 



Ploas, Latr. [Conoplwrus, Sleig.), has this joint much thicker than the rest. 



Cyllenia, has this joint merely longer, but not thicker, and the abdomen is more elongated, and nearly conical. 



Anthrax, Scop. {Anthracii, Latr.), — 

 Similar to the Bombylii, wdth the body depressed, or but slightly elevated above ; not gibbose, with 

 the head as high and broad as the thorax. The antennae are always very short, and, except in 



