278 SIR JOHN LUBBOCK ON THYSANURA. 
que le bord antérieur quand on la regarde en dessus (fig. 14). Deuxième segment, 
du double plus long que le suivant. Le sixième plus long que les trois précédents 
pris ensemble, et recouvert sur les cótés latéraux par un prolongement angulaire du 
cinquième: Yeux noirs. Filets de la queue blancs et finement striés transversale- 
ment. : 
* Cet insecte offre un léger reflet métallique produit par quelques écailles ; longueur 
environ 2 millimètres. Se trouve dans les jardins, sur la terre; trés-rare: vit soli- 
taire.” 
Nicolet must, I think, have had before him immature or injured specimens. "When 
full-grown, and unrubbed, this species is very beautiful, and reflects the most gorgeous 
metallic tints. Its general appearance is most singular; the depressed position of the 
head, and the gait, give it a ludicrous resemblance to a Hippopotamus; and at the same 
time the body does not look as if it belonged to the head and legs, but rather as if it were 
some foreign body being carried on the back. . 
The head is scarcely seen from above. The fringe of scales on the front of the thorax 
is turned down; and there are a certain number of long hairs, some of them bent. 
The eggs are laid in heaps, and are spherical, with a diameter of about 73> of an inch. 
They are at first smooth, but after a few days are covered with filaments. 
ISOTOMA GRISEA, n. sp. 
Dark grey, with a leaden tinge. Eyes on a black spot. Legs and antennz of the same 
colour as the body. Second and third segments of antennæ equal in length. The 
whole body covered with very short, close, white hairs; the posterior part of the 
abdomen with a few longer ones. "Terminal segment of spring straight, or turned 
slightly outwards. Feet without tenent hairs; the large claw has a single tooth on 
the inner side. 
Length 7}; of an inch. Under boards, on a hotbed. Common. September to March. 
Ilong thought this was the young of some larger species; but having watched them 
in their native haunts, and kept them for some time in confinement, I am satisfied that 
it is an independent species. My specimens do not exactly coincide with any of those 
described by Nicolet. The forms of the antennæ and of the spring distinguish it from 
the species forming his first section of the genus; nor is there any one in the second 
which it much resembles. 
LIPURA MARITIMA Guérin. 
Achorutes maritimus Guér. Icon. du Régne Anim. Ex. Ins. p. 11; Suites à Buffon, Aptéres, vol. iii. 
p. 439 
Dark purple. Eyes five in number, two in front and three behind. 
Length $ of an inch. 
This species was found by M. Guérin at Treport, in Normandy. He described it as an 
Achorutes; but he expressly says it could not jump, and there can be little doubt that, 
as M. Gervais has already suggested, his specimens really belonged to the genus Lipura. | 
