CLASS V. IXSECTA. 301 



Genus 551. OCYPTEllYX. Lcacli. Ocyptera. Latr. Exorista. 

 Miig. Eriothrix. ^lei<:. 

 Antenna: with their last joint longer ihun the others : ubJumen dibtinctly 



annulatcd, rounded. 

 .Sp. 1. Oci/pt. luteraiis. Leach. « 



Inhabits woods. 



Genus 55Q. GYMNOSOMA. Mek., Leach. 

 Antenna: with their last joint longer tliaa the others : uhdomen semi- 

 circular, subuniarticulate. 

 Sp. 1. Gj///i. Tutundata. Meig. 



Genus 553. ECHINOMYIA. Bum., Latr., Lcac/i. Taciiina. 

 Meig.^ Fdl'v. 

 Antenntc with their second joint longer than the others : abdomen sub- 

 globose, and very bristly. 

 Sp. 1. JLcli. grossa. Latr. 

 Inhabits woods. 



Genus 554. TACHIXA. leac/,. 

 Antenna: with their second juint longer lluiu the others : uhdomeu 



ovate, rather bristly. 

 Sp. 1. Tuch.fha. 

 Inhabits the skirts and pathways in woods. 



Fam. XV. (Estrid.*.. Leach. 

 Mtjscides, I. Latrcille. Astomata. Dunicril. 



The larvfe of all the insects of this family reside in the frontal 

 sinuses under the skin, or in the stomachs of graminivorous mam- 

 malia. Their curious economy has been admirably detailed m the 

 third volume of the Transactions of the Linneun Socktij of London 

 by ]Mr. Bracy Clark, who has lately republished his ]3issertalion 

 under the title An Essay on the Bots of Hoists and other Animals. 

 London, 1815. 



Genus 555. (ESTRUS of authors. 

 Wings with the two exterior cells complete, the other hinder cells ter- 

 minal : thorax with its surface unequal : abdomen with its point de- 

 flexed ; of the female acuminate : fj/es distant; of the male closer 

 than those of the female. 



* Tliorar roiighish, uith elevated points. 



The larvas of the species of this division of the genus inhabit the 

 frontal sinuses. 



Sp. 1. CEsfrns Ovis. 



Inhabits the frontal sinuses of the sheep in the larva state ; the per- 

 fect insect is found on walls and stones in the vicinity of sheep- 

 folds. 



