306 Mr. R. Templeton's Memoir 



Labium 4dri-lobed, the outer triangular, pilose, supporting the 

 3-jointed palpus, the inner somewhat square (fig. 7). 



(Mentum leathery ; it seems like a collar closing the aperture of 

 the mouth posteriorly). 



In short, it seems to me not unreasonable to imagine that on 

 further investigation these will again be associated with the true 

 insects, the only difficulty being the rudimentary organs thrown 

 out to compensate the want of support afforded by the hind legs, 

 or at least that they will be considered a completely distinct class 

 from the Myriapods and be divided into two orders, Thijsanura 

 and Podura. All this however merits consideration and careful 

 examination. 



I see that Guerin has figured, under the name of Podura suc- 

 cincta, an addition to my subgenus OrcJieniUa. P. nitida, nigro- 

 maculata, albo-cincta, and grisea, Fab., must form a new subgenus,* 

 so must my cingula and fuliginosa ; stagnorum and arborea, Lin., 

 another ; aquatica, lAi\.^ Jimetaria, Lin., amhulans, Fab., with duh'ius 

 and muscorum, another : and I wish the name I gave this last 

 changed from Achoreutes to Rathumoules. 



I have now to direct your attention to some Myriapods. The 

 genus Cermat'ia of Illiger has been to me always a puzzle, but I 

 am at length satisfied of the existence of the following species : — 

 At the Cape I became acquainted with a considerable number of 

 a species of this genus, and I was struck with the constancy with 

 which the relative proportions of the various parts of the body 

 were maintained, and it gave me the clue to the unravelling of the 

 doubts and difficulties I had previously to contend with ; some 

 minute characters derived from the dorsal plates likewise gave me 

 assistance. The species I consider distinct are the following : — 



I. Those with the body elongate and decidedly increased in 

 breadth about the middle. 



Sp. 1. Cermat'ia araneoides. 



Julus araneoides, Pallas. Differs from all the otiiers, as far as 

 we can trust to his figure and excessively minute description, 

 in the extreme narrowness of the body and in the equality of 

 length of the antennas and hind legs, both being nearly one half 

 longer than the body. 



Length 1.33 inch., relative proportions of body, antennae, and 

 hind feet, 1.0, 1.4, 1.4. 



* Vtenura, with long antenn;e of four aiticulations, the tliiid not longer than 

 the fourth, wliicii distinguishes them from I'od. plumbea. 



