372 Mr. R. I. Pocock on the History of a 



following description of the specimen from St. Michael's 

 Mount : — 



Lithobius pilicornis, Newport. 



Lithobius pilicornis, Newport, Ann. & Mag. Nat. Hist. xiii. p. 96. no. 5 



(1844) ; Trans. Linn. Soc. xix. p. 369. no. 13 (1845) ; Cat. Myrio- 



poda Mus. Brit. p. 20 (1856). 

 Lithobius Sloanei, Newport, Ann. & Mag. Nat. Hist. xiii. p. 96. no. 6 



(1844) ; Trans. Linn. Soc. xix. p. 369. no. 12 (1845) ; Cat. Myriopoda 



Mus. Brit. p. 19 (1856). 

 Lithobius longipes, von Porath, CEf. Vet.-Akad. Forh. xxvii. p. 816 



(1870) ; Meinert, Nat. Tidsskr. (3) viii. p. 323 (1872) ; id. Vid. 



Medd. Foren. 1884-86, p. 109. 

 Lithobius yalathece, id. ibid. 



Colour (in alcohol *) deep castaneous above and below, the 

 arthrodial membranes greyish blue ; shining. 



Head-plate pentagonal, sparsely punctured and hairy. 



Antennas hirsute, composed of thirty-two or thirty-three 

 long cylindrical segments, of which the second is the longest ; 

 apical segment only very slightly longer than the penul- 

 timate. 



Eyes composed of about twenty-six ocelli, arranged in five 

 or six rows. 



Maxillary sternite sparsely punctured and hairy ; prosternal 

 plates well developed, separated by a deep excavation, each 

 armed with five long sharp teeth, of which (counting from 

 the inside) the first, second, and third are close-set, while the 

 fourth is separated from the third, and the fifth from the 

 fourth by a wider space. 



Tergites mostly smooth, those at the posterior end of the 

 body being, however, roughened and granular; most of them 

 with rounded angles ; the eleventh, however, has its angles 

 slightly produced and the thirteenth has them more strongly 

 produced. 



Sternites sparsely punctured and hairy; longitudinally 

 depressed in the middle and lightly depressed at the sides. 



Legs long and hairy, the tarso-metatarsus being especially 

 hirsute ; the posterior four coxse furnished with 8, 9, 9, 7 long 

 slit-like pores ; anal legs long, coxas armed with one lateral 

 and one inferior spine, the other segments armed beneath 

 as follows: — 1, 3, 2, 1, 0; claw unarmed. 



Generative forceps in female furnished with two spurs on 

 each side ; the claw obsoletely trifid. 



* Mr. Thomas informs me that when living the specimen was of a deep 

 dull green tint. This green has changed to a deep red from the action of 

 the methylated spirit. 



