ORDER VI. DIPTERA. 
71 
The insects of this genus live on garbage; the larvae have no feet, 
they are cylindrical and soft ; they l'eed on the roots of plants under 
which they live ; the pupae are motionless and cylindrical, with two 
horns before, dentated behind. Some species live in the water, anu 
either swim or roll themselves up in a case. 
Sp. 1. T. oleracea. (PL 9. fg. 2.) 
Genus 79. Musca. 
Mouth with a fleshy exserted proboscis; two equal lips and a haustellum 
furnished with setae, and two short palpi; untenna: inmost species 
short. 
Sp. 1. M. inanis. (PL 9. fig. 3.) 
Genus 73. Tabanus. 
Mouth with a straight exserted membranaceous proboscis, ending in an 
ovate capitulum or knob; with two equal lips; haustellum projecting, 
exserted, and received into a groove in the back ol the proboscis; 
vagina univalve, with five seta and two equal pulpi, the last articula- 
tion of which is thicker than the rest ; aiUcmie short, approximate, 
cylindrical, with seven articulations; the third generally largest, and 
armed with a lateral dent. 
The insects of this genus suck the blood of animals, they are of a 
dull plain appearance, but their large eyes are in general beautifully 
coloured — these colours fade after they are dead. 
Sp. 1. T. tropicus- (PL 9. fg- 4.) 
Genus 74. Cci.r.x, the Gnat. 
With an exserted, univalve, flexible vagina; five setce; palpi two, con- 
sisting of three articulations; antenna filiform, 
Sp. 1. C.pipiens. (PL 9. fg. 6-) 
Inhabits Europe and the northern parts of Asia and America. ; 
This insect is frequent in the neighbourhood of waters and marshy 
Places. In southern regions there is a larger species which is known 
by the name of Mnsquetoe. Its bite is painful, raising a considerable 
degree of inflammation, and its continual piping note is exceedingly 
irksome where it abounds, especially during the night. W hen it settles 
to inflict the wound and draw the blood, it raises its bind pair ot ieet. 
In Lapland, the injuries the inhabitants sustain from it are amply re- 
paid by the vast numbers of water-fowl and wild-fowl whieh it attracts, 
as it forms the favourite food of their young. 
Genus 7o. Empis, 
Haustellum inflected; vagina univalve, with three set® and a proboscis; 
palpi short and filiform; antenna; setaceous. 
The changes of these insects are unknown; they are common on 
