70 LINNEAN SYSTEM. 



Genus 69. Mutilla. 



Mouth horny, williout a tongue : maxilla membranaceous at the apex, 

 the Up projecting, ol)Conical, Ijcaring on its apex four unequal ptilpi 

 with obconical articulations : unfenna tiliform. In general the males 

 are winged, and the females are apterous: 6o(/y pubescent : sting 

 concealed. 



Sp. 1. Mutilla curopaa. (P/. 8. Jig. 11. male.) 



Order VI. DIPTERA. 



This Order includes all those insects that have but two wings, and 

 behind, or below them, two globular bodies, supported on slender pe- 

 dicles called HalUrcs orpoisers. At the mouth they have a proboscis, 

 sometimes contained in a vagina, and sometimes furnished at its sides 

 with two palpi but no maxilla. Their eyes are reticulated and large. 

 The females, in general, lay eggs, but some are viviparous; the larvce 

 of the insects of this order are as various in their appearance as the 

 places in which they are bred. In general they do not cast their skins, 

 but change into a pupa state. 



Genus 70. Oestrus, Gad-Jly. 



Hauslelhim retracted within the lips, which are tumid and grown to- 

 gether with a small pore and no palpi ; the vagina is membranaceous, 

 cylindrical, obtuse, including three membranaceous sdff, which are 

 flexible, short, and reflected; antenna short and setaceous. 

 The insects of this genus lay their eggs in the nostrils or in the skins 

 of horses, oxen, rein-deer, goats, and sheep ; their larva is bred, and 

 feeds on the fat of these animals, or on the matter which is generated 

 in the wound. It is soft and without feet : -in some species it has at the 

 extremity two hooks, which it uses to assist it in walking. These hooks 

 are wanting in the larva; which reside in the skins of oxen and rein- 

 deer. When full grown the larvte let themselves fall on the ground, 

 they enter the earth and change into an oval hard pupa. The perfect 

 insect takes no food. [Mr. Bracy Clark has written an excellent paper 

 on the insects of this genus, published, in the third volume of the 

 Transactions of the Linneun Socicfi/ ; which has been re-published with 

 additional remarks, and entitled an Essay on the Bots of Horses, &c. 

 4to, 1815.] 



Sp. 1. O. Bovi3. {PL 0. fig. 1.) 



Genus 71. Tipula. 

 Mouth furnished with a very short proboscis, membranaceous, grooved 

 on the back, and receiving a bristle ; a short haustcllum without a 

 vagina; two incurved palpi, equal, filiform, and longer than the head j 

 antennas in most species filiform. 



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