British Oribaddee. Btj A. D. Michael. 197 



The first and second pairs are rather shorter and thicker than the 

 third and fourth pairs. Each tarsus hears one long hair as long 

 as the whole leg, and there are several shorter curved hairs down 

 each leg, and two or three pairs on each tarsus. 



The creature at first has much the appearance of a cheese 

 mite ; it seems to be social and to form a kind of loose web under 

 lichen. On this web it may be found in great numbers, and in 

 all stages of growth, from the larva to the inert nymph. The 

 perfect creature is common on the lichen. Amongst the nymphs I 

 found the predatory mite, Cheyletus fiahellifer, which I first found 

 in a cellar feeding upon Glycipliagus pahnifer. 



SCUTOVERTEX SCULPTUS. Mihi. 



Nijmph, PI. VI. Fig. 10. 

 (Perfect creature, vol. ii., PL XI. Fig. 4.) 



Colour light umber brown, darker on the rostrum. 



The eephalothorax is more than a third of the entire length, 

 very broad at the base, being the full width of the anterior margin 

 of the abdomen, and the line where they join being the widest part 

 of the body ; it is conical, much shorter than its greatest width, 

 the apex slightly truncated or rounded, with a small point in the 

 centre of the truncated line. An almost square chitinous plate, 

 with projecting anterior angles, marks the place of the tectum in 

 the adult, and is evidently an early stage or analogue of tbat part ; 

 it has transverse markings. This plate has a smaller, less chitinous, 

 square plate behind it, which almost reaches the abdomen. The 

 stigmata are small and near together on the dorsal surface ; stigma- 

 tic hairs rather long and stout, thicker towards the end, which is 

 lanceolate. The legs are set at the edge of the body, and much 

 resemble those of the adult, but are shorter, and armed with a few 

 stout spikes in addition to the hairs. 



The abdomen has a slightly concave anterior margin, and 

 narrows gradually from tlience until near the posterior one, which is 

 rounded. The whole abdomen is deeply corrugated by folds of the 

 soft skin ; two or three of these folds run on to the corner of the 

 eephalothorax, cutting off a small triangle on each side ; six or seven 

 fokls arc parallel to the anterior margin, but become shorter as they 

 get further liack. Behind these the folds enclose a trapeze-shaped 

 space, and behind this they have a tendency to a reversed direction, 

 but over the anus they again point forward, and along the sides 

 th(!y are crowded and irregular, and give a broken outline to the 

 creature. The corrugations do not <init(; agree in dillrrcnt indivi- 

 duals nor in the same one at dillrrcnt ages, nor. indeed, on the two 

 sides of a specimen. The under surface of the abdomen is also 

 corrugated. The anal plates are very large, convex, and diamond 

 shaped. 



