302 MODERN SYSTEM. 



** Thorax zvU/t square sinning naked r.pofs. 



The larvae of this section reside beneath the skin of herbivorous mani- 



malia. 

 Sp. 2. (Estrus Bovis. {PI. 9. fig. 1.) 



" The larvae of this species, named by the peasants Warbles, or 

 Wornils, are found beneath the skin on the backs and loins of oxen, 

 causing tumours as large as pullets' eggs. The perfect insect, or 

 gad-fly, appears about the end of summer, and is much dreaded by 

 cattle." 



Genus 556. GASTEROPIIILUS. Leach. CEstrus of authors. 

 Wings with all the hinder cells terminal : thorax with its surfaces 

 smooth : abdomen with its extremities inflexed ; of the temale, very 

 much eloiisiated and attenuated : ei/es in both sexes equally distant. 

 " The larvffi of the Gasterophili, as their name imports, inhal)it 

 the stomach of herbivorous quadrupeds, and are called Bots ; tlw 

 y'' perfect insect Bot-fiies.'' 



Sp. 1. Gasf. Equi. Leach, Trans. Wern. Nat. Hist. Soc. vol. ii. 

 (Estrus Bovis. Limit. Q],strus Equi. Clark. 

 The larva? inhabit the horse. 



\ 



Order XVI. OMALOPTERA. T^cuch. 



DiPTERA of authors. 



Mouth with mandibles and maxilla: : lip simple : -wings two or none 

 {^Metamorphosis coarctate). 



Fam. I. HiPPOBOsciD.i:. Leach. 



Head divided from the thorax by a suture at least : proboscis provided 

 with tw« valves : vails of the tarsi double or treble. 



" The larvae are nourished within the abdomen of the mother, 

 and, when full grown, are passed in the form of an oviform pupa, 

 covered with the indurated skin of the larva-." In the second vo- 

 lume of the Transactions of the We?'ncrian Natural History Societj/ if 

 Edinburgh is given a most excellent ^laper on the insects of this 

 family by Dr. Leach. The following arc natives of this country : 



Stjrps 1. — Wings two; the hinder cell only commenced: thorax an- 

 teriorly entire, acuminated. 



Genus 557. HIPPOBOSCA of authors. Nirmomyia. Nitzsch. 



Ocelli none. 



Sp. 1. Hipp, equina. Linnc, Leach. (Forest-fly.) {PL 9. fg. IL) 



Inhabits the horse. In the New Forest of Hampshire they abound in 

 a most astonishing degree. I have obtained from the flanks of one 

 horfec six handful Is, which consisted oi' upwards of a hundred si>e- 



