CLASS V. IXSECTA. 141 



Genus 3. PETROBIUS. Leadis Zoological MisctUany, vol. iii. 

 tub. \Ai>. Lei'ISMa. Fabr.f 



AntctiJKe longer than the body, inserted under the eyes: maxiUary palpi 

 six-jointed; the fifth joint inversely conic, the sixth conic: Inbial 

 palpi with the last joint obliquely truncate, with the apex acute, and 

 not membranaceous : eyes large and contiguous. 



Sp. 1. Pet. muridmus. Blackish, with golden scales: feet yellowish: 

 seta of the tiiil annulatcd with white. 



Inhabits all the rocky shores of Britain. Dr. Leach first obser\ed this 

 species on the Devonshire coast, and afterAvards in Ireland, Scotland, 

 and Wales. It is very active, runs fast, and leaps to a great distance. 

 Dr. L. suspects tliat it has been confounded by Fabricius with For- 

 bid na polypoda. 



Tam. II. PoDLUAU.?:. Leach. 



Palpi not exserted nor very conspicuous : antenna composed of four 

 joints, the last sometimes fonued of several otlier minute articula- 

 tions : tail forked, and bent beneath the abdomen. 



G^nus 4. PODURA. Linn., Geoff, De Gccr., Fabr., Lam., Her- 

 mann, Lcac/i. 



Antennic with the last joint solid, not articulated : abdomen elongate, li- 

 near. 



Sp. 1. Pod. plumbca. Lead-coloured, shining, with griseous head and 

 feet. 



Podura plumbea. Linn., Fabr., Latr., Leach. Podure plombee. De 

 Geer. La Podure grise commune. Geo(f'. 



Inhabits Europe under stones. 



There are a great number of species in this and the following ^e- 

 nus, which are worthy of attention. Fabricius has placed these 

 two genera together without the slightest distinction, and has de- 

 scribed several species, which it is hoped some future zoologist will 

 be induced to examine. 



Genus 5. SMYNTIIURUS. Latr., Leach. Podura. Linn., Fabr., 

 De Gccr, Geoff. 

 Sp. 1. Smyn.fuscus. Body entirely brown. 

 La Podure brun enfumee. Geoff. Fodma o.\ra. Linn.? Fabr. Sniyn- 



thurus fuscus. Latr., Leach. 

 Inhabits Europe; is common on the ground and in damp hedges. 



Order 11. ANOPLURA. Leach. 

 Paeasita. Latreille. 



Tail without seta; or filaments : mouth in some furnished with two 

 teeth (or mandibles.'') and an opening beneath; in others with a 

 tubulose very short haustellum. 



The animals of this Order arc parasitical, and ^xcre by Latreille 



