302 MODERN SYSTFM. 



** Thorax with square shining naked xpots. 



The larvcxof this section reside beneath the skin of herbivorous main- 



maha. 

 Sp. 2. (Estrus Boris. (PL 9. fig. 1.) 



" The larva? of tliis species, named by the peasants Warbles, or 

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

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

 gad-fly, appears about \he end of sunnner, and is much dreaded by 

 cattle." 



Genus 536. GASTEROPHILUS. Leach. GEsnirs of authors. 

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

 smooth : abdomen with its extremities indexed ; of the female, very 

 much elongated and attenuated : c^es in both sexes equally distant. 

 " The larvae of the Gasterophili, as their name imports, inhabit 

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

 perfect insect Bot-tlies." 

 S[). 1. Cast. Equi. Leach, Trans. Wern. Nat. Hist. See. vol. ii. 

 Cl'lstrus Bovis. Linni. lEstrus Equi. Clark. 

 The larva" inhabit the horse. 



Order X\ I. OMALOPTERA. Leach. 



DiPTEF.A of authors. 



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

 {Aletamorphosis coarctate). 



Fam. I. lIiPPonosciD^:. Leach. 



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

 with two valves : nai/s of the tarsi double or treble. 



" The larvae are nourished within the aljdomen 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 Tran.Sitctions of the Wenicrian Natural Histoiy Sociefj/ of 

 Edinburgh is given a most excellent paper on the insects of tliis 

 familv bv Dr. Leach. The foUowiuii; are natives of this countrv: 



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

 teriorly entire, acuminated. 



Genus 557. HIPl'OBOSCA <^" fl?<f//o;s. Nirmomyia. Nitzsch. 

 Ocelli none. 



:p. 1. Hipp, equina. Linne, Leach. (Forest-fly.) {PI. 9. Jig. 11.) 

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

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

 horse six handfuUs, which consisted of upwards of a hundred spfe- 



c. 



