SIR JOHN LUBBOCK ON THE THYSANURA. 303 



Achorutes rufescens, Linnaeus. 



* 



ifescens, Nicolet 



Brick-red ; eyes on a black patch ; abdominal hooks very minute. 

 Common in winter among dead leaves. 



LlPURA FIMETARIA, L. (PL XXII. figs. 27, 28.) 



Podura fimetaria, Linnaeus, i. p. 2909. 



, Schrank, En. Ins, Aus. p. 497. 



, Fabricius, Ent. Syst. p. 67. 



; Lucas, Hist. Nat. Crust. Arachn. et Myriapod. p. 565 



Lipur a fimet aria , Burmeister, Handb. der Ent. xi. p, 447. 

 Anurophorus fimetarius, Nicolet, Mem. Soe. Helv. 1839. 

 Adicranus , Bourlet, Mem. Soc. Roy. Douai, 1842. 



volvator, Gervais, Suites h Buffon, Apteres, iii. p. 442. 



fimetarius, Nicolet, Ann. Soc. Ent. France, 2 e ser. v. p. 385. 



"White ; skin granular ; prothorax short, but not covered by mesothorax ; poster 



tremity of abdomen without hooks. 

 Length -r^ of an inch. 



■&"■"■ 10 



In damp places, under boards, flowerpots, &c. Common, sociable. 



The antennae are shorter than the head ; they are four-jointed and somewhat clubbed 

 The articulations between the second and third, and third and fourth segments are oblique 

 The organ is covered with short, stiff hairs, which are most numerous on the apica 



segment 



'D 



The mandibles have four teeth each; in one of them the penultimate tooth projects 

 beyond the others. 



The body is thinly clothed with short scattered hairs. The legs are short. The larg. 

 claw is big and simple; the smaller one resembles a seta, but is thickened at the base. 

 There are no tenent hairs. 



This species has frequently been confounded with L. ambulans, which, indeed, it very 

 much resembles. They may, however, be at once distinguished by the posterior end of 

 the abdomen, which in Z. ambulans is armed with two small upright hooks ; these are 

 entirely absent in the present species. According to Nicolet, there is also a considerable 

 difference in the eyes. In L. ambulans these are fourteen in number on each side, 

 arranged in two parallel lines running obliquely across the head immediately behind the 

 antenna*. L. firnetaria, on the contrary, has only eight eyes on each side, which torm an 

 oblong group. They are, however, in both species very difficult to make out. ■ 



As Nicolet has himself pointed out, his Anurophorus fimetarius (Podurelles, p. ) 

 really the P. ambulans of Linnaeus. „ . . . . ._„ 



From L. corticina and L. Uriels, which are probably identical, L fanetana is at once 



distinguished by the colour. , ,,., • nlim 



One of my specimens laid some eggs on the 8th September ; they were niteen 



be r, spherical, white, and t** of an inch in diameter. 



vox- xxvi. 



2 T 



