ORDER VI. DIPTERA. 71 



The insects of this genus hve on garhagc ; the lanvns have no feet, 

 they are cyhndrical and soft ; they feed on the roots of plants under 

 which they live; the pups are motionless and cylindrical, with two 

 horns hefore, dentated behind. Some species live in the water, and 

 either swim or roll themselves up in a case. 

 Sp. 1. T. okracca. {PL 9. Jig. 2.) 



Genus 7'2. Musca. 

 Mouth with a fleshy exscrted proliosc-is ; two equal lipx and a hausteUwn 



furnished with setie, and two short ^;«//;<; untcniuem nwsX species 



short. 

 Sp. 1. M. inanis. {Fl. 9. fg. 3.) 



Genus 73. Tabanus. 



Mouth with a straight exscrted membranaceous prol)oscis, ending in an 

 ovate capltulum or knob; with two ecpial lipH ; haustcUnni projecting, 

 c.xserted, and received into a groove in the back of the proboscis; 

 rcigina univalve, with five seta- and two equal pnlpi, the last articula- 

 tion of which is thicker than the rest ; antenna: short, ap])roximate, 

 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 j)lain appearance, but their large eyes are in general beautifully 



coloured — these colours fade after they are dead. 



Sp. 1. T. tropicus. {PL 9. fig. 4.) 



Genus 74. Culek, the Gnat. 

 With an exserted, univalve, flexible vagina; five seta; palpi two, con- 

 sisting of three articulations; antcnnce fiViioriVL. 

 Sp. 1. C.pipiens. {PL 9. jig. 5.) 

 Inhabits Europe and the northern parts of Asia and America. 



This insect is frequent in the neighbourhood of Avaters and marshy 

 places. In southern regions there is a larger species which is known 

 by the name of Musijiwtoe. 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. When it settles 

 to inflict the wound and draw the blood, it raises its hind pair of feet. 

 In Lapland, the injuries the inhabitants sustain irom it are amply re- 

 paid by the vast numbers of water-fowl and wild-fowl which it attracts, 

 as it ibrms the favourite food of their young. 



Genus 75. Empis. 

 Hanstellinii inflected; vagina univalve, with three sets and a proboscis; 

 palpi short and filiform; antenna ^cta-ccou^. 

 The changes of these insects are unknown; they are common on 



