I40 



ARACHNOIDEA, 



CASE 

 IX. 



Genus Calyptostoma. 

 Calyptostoma hardyi (Cambridge Ann. Nat. Hist. 1875). 



As these pages are passing through the press, a new genus and 

 species has been described by Mr. Cambridge, differing in a 



Upper side. Under side. Side view. 



Calyptostoma Hardyi. Copied from Mr. Cambridge's figure. 



remarkable manner from any known type of Trombidium, and 

 running counter to all the characters hitherto used-to define that 

 family, but still unquestionably belonging to it. It will be seen 

 that the mouth in this species is a mere hole on the anterior part 

 of the underside of a bladder-shaped body, and the parts in it 

 seem, in Mr. Cambridge's figure, too indistinct to be depended 

 upon. It has all the aspect of a larva with eight legs, the larvae 

 of Trombidium having little or no appearance of a head or mouth. 

 If it had been a six-footed insect with the form of a mature 

 species, that might have been explained away by supposing that 

 all the changes of skin were not over, and that, as sometimes 

 happens, the mature form was anticipating the final change and 

 complete perfection of form ; but here the signs of maturity that 

 last appear are present, while the form of the body still remains 

 that of a larva. It was found by our old friend Mr. Hardy in 

 the Cheviot Hills. 



Genus Erythr^us. 

 This genus is distinguished from Trombidium, by having no 

 division of the body, and by the last joint of the legs being very 

 long and slender. It is glabrous, semi-transparent, and has a 

 pink or carmine shade of colour. 



