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XXXIII. On the Arrangement of (Estrideous 

 Insects, 



By William Elford Leach, Esq. 

 (Read Qth April 



(ESTRIDEA. 



Character Essentialis, 



Alas duae. 



0$ clausum ; instrumentis cibariis impeifectis. 



Genus I. GESTRUS. 



CEsTRUs auctorum. 



AUb cellulis duabus limbalibus exterioribus perfectis ; interiori- 



bus terminalibus. 

 Thorax superficie inaequali. 

 Abdomen apice deflexum : FffiMiN^E acuminatum. 

 OcuU distantes ; maris approximatiores. 



* Thorax punctis elevatis scabriusculus. 



Sp. 1. Ovis. 



(Estrus ovis. Linn. — Clark, Trans, Linn, Soc. in, 



** Thorax maculis glabris nitidis nudis tessalattis, 

 Sp. 2. Bovis, 



CEstrus bovis, Clark, Trans. Linn. Soc, iiu 



002 



